Relevant bibliographies by topics / Single-phase Turbulent Flow

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  2. Dissertations / Theses
  3. Books
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Academic literature on the topic 'Single-phase Turbulent Flow'

Author: Grafiati
Published: 4 June 2025
Last updated: 15 July 2025

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Journal articles on the topic "Single-phase Turbulent Flow"

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Wang, S. K., S. J. Lee, O. C. Jones, and R. T. Lahey. "Statistical Analysis of Turbulent Two-Phase Pipe Flow." Journal of Fluids Engineering 112, no. 1 (1990): 89–95. http://dx.doi.org/10.1115/1.2909374.

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The statistical characteristics of turbulent two-phase pipe flow have been evaluated. In particular, the autocorrelation functions and the power spectral density functions of the axial turbulence fluctuations in the liquid phase were determined. The high frequency content of the power spectrum in bubbly two-phase pipe flow was found to be significantly larger than in single-phase pipe flow and, in agreement with previous studies of homogeneous two-phase flows (Lance et al., 1983), diminished asymptotically with a characteristic −8/3 slope at high frequency. The power spectrum and the autocorrelation functions in two-phase pipe flow, although distinctively different from those in single-phase pipe flow, were insensitive to the local void fraction and the mean liquid velocity when plotted against wave number and spatial separation, respectively. Finally, the dissipation scale, determined from the shape of the autocorrelation function, indicated that the turbulent dissipation rate in two-phase pipe flow was significantly greater than that in single-phase pipe flow.
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Pakhomov M. A. and Terekhov V. I. "Effect of sudden constriction of a flat duct on forced convection in a turbulent droplet-laden mist flow." Technical Physics Letters 49, no. 4 (2023): 14. http://dx.doi.org/10.21883/tpl.2023.04.55868.19453.

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Numerical modeling of the flow structure and heat transfer in a gas-droplet turbulent flow in a duct with forward-facing step is carried out. The two-dimensional RANS equations are used in the numerical solution. The Eulerian two-fluid approach is used for describing the flow dynamics and heat transfer in the gaseous and dispersed phases. The turbulence of the carrier phase is described using an elliptical Reynolds stress model with taking the presence of dispersed phase. It is shown that finely-dispersed droplets are involved in the separation recirculation motion of the gas phase. The addition of evaporating droplets to a single-phase turbulent flow in the forward-facing step leads to a significant intensification of heat transfer (more than 2 times) compared to a single-phase air flow, all other parameters being equal. This effect is enhanced with an increase in the initial mass fraction of the water droplets. Keywords: Numerical simulation, Reynolds stress transport model, forward-facing step, droplet evaporation, turbulence, heat transfer enhancement.
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Roy, R. P., V. Velidandla, and S. P. Kalra. "Velocity Field in Turbulent Subcooled Boiling Flow." Journal of Heat Transfer 119, no. 4 (1997): 754–66. http://dx.doi.org/10.1115/1.2824180.

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The velocity field was measured in turbulent subcooled boiling flow of Refrigerant-113 through a vertical annular channel whose inner wall was heated. A two-component laser Doppler velocimeter was used. Measurements are reported in the boiling layer adjacent to the inner wall as well as in the outer all-liquid layer for two fluid mass velocities and four wall heat fluxes. The turbulence was found to be inhomogeneous and anisotropic and the turbulent kinetic energy significantly higher than in single-phase liquid flow at the same mass velocity. A marked shift toward the inner wall was observed of the zero location of the axial Reynolds shear stress in the liquid phase, and the magnitude of the shear stress increased sharply close to the inner wall. The near-wall liquid velocity field was quite different from that in single-phase liquid flow at a similar Reynolds number. Comparison of the measurements with the predictions of a three-dimensional two-fluid model of turbulent subcooled boiling flow show reasonably good agreement for some quantities and a need for further development of certain aspects of the model.
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Lemenand, Thierry, Pascal Dupont, Dominique Della Valle, and Hassan Peerhossaini. "Turbulent Mixing of Two Immiscible Fluids." Journal of Fluids Engineering 127, no. 6 (2005): 1132–39. http://dx.doi.org/10.1115/1.2073247.

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The emulsification process in a static mixer HEV (high-efficiency vortex) in turbulent flow is investigated. This new type of mixer generates coherent large-scale structures, enhancing momentum transfer in the bulk flow and hence providing favorable conditions for phase dispersion. We present a study of the single-phase flow that details the flow structure, based on LDV measurements, giving access on the scales of turbulence. In addition, we discuss the liquid-liquid dispersion of oil in water obtained at the exit of the mixer/emulsifier. The generation of the dispersion is characterized by the Sauter diameter and described via a size-distribution function. We are interested in a local turbulence analysis, particularly the spatial structure of the turbulence and the turbulence spectra, which give information about the turbulent dissipation rate. Finally, we discuss the emulsifier efficiency and compare the HEV performance with existing devices.
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Пахомов, М. А., та В. И. Терехов. "Влияние внезапного сужения плоского канала на вынужденную конвекцию в турбулентном газокапельном течении". Письма в журнал технической физики 49, № 7 (2023): 16. http://dx.doi.org/10.21883/pjtf.2023.07.54915.19453.

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Numerical modeling of the flow structure and heat transfer in a gas-droplet turbulent flow in a duct with forward-facing step is carried out. The two-dimensional RANS equations are used in the numerical solution. The Eulerian two-fluid approach is used for describing the flow dynamics and heat transfer in the gaseous and dispersed phases. The turbulence of the carrier phase is described using an elliptical Reynolds stress model with taking the presence of dispersed phase. It is shown that finely-dispersed droplets are involved in the separation recirculation motion of the gas phase. The addition of evaporating droplets to a single-phase turbulent flow in the forward-facing step leads to a significant intensification of heat transfer (more than 2 times) compared to a single-phase air flow, all other things being equal. This effect is enhanced with an increase in the initial mass fraction of the water droplets.
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Rosti, Marco E., Zhouyang Ge, Suhas S. Jain, Michael S. Dodd, and Luca Brandt. "Droplets in homogeneous shear turbulence." Journal of Fluid Mechanics 876 (August 9, 2019): 962–84. http://dx.doi.org/10.1017/jfm.2019.581.

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We simulate the flow of two immiscible and incompressible fluids separated by an interface in a homogeneous turbulent shear flow at a shear Reynolds number equal to 15 200. The viscosity and density of the two fluids are equal, and various surface tensions and initial droplet diameters are considered in the present study. We show that the two-phase flow reaches a statistically stationary turbulent state sustained by a non-zero mean turbulent production rate due to the presence of the mean shear. Compared to single-phase flow, we find that the resulting steady-state conditions exhibit reduced Taylor-microscale Reynolds numbers owing to the presence of the dispersed phase, which acts as a sink of turbulent kinetic energy for the carrier fluid. At steady state, the mean power of surface tension is zero and the turbulent production rate is in balance with the turbulent dissipation rate, with their values being larger than in the reference single-phase case. The interface modifies the energy spectrum by introducing energy at small scales, with the difference from the single-phase case reducing as the Weber number increases. This is caused by both the number of droplets in the domain and the total surface area increasing monotonically with the Weber number. This reflects also in the droplet size distribution, which changes with the Weber number, with the peak of the distribution moving to smaller sizes as the Weber number increases. We show that the Hinze estimate for the maximum droplet size, obtained considering break-up in homogeneous isotropic turbulence, provides an excellent estimate notwithstanding the action of significant coalescence and the presence of a mean shear.
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Akeel, M. Ali Morad, M. Qasim Rafi, and Ahmed Ali Amjed. "STUDY OF THE BEHAVIOURS OF SINGLE-PHASE TURBULENT FLOW AT LOW TO MODERATE REYNOLDS NUMBERS THROUGH A VERTICAL PIPE. PART I: 2D COUNTERS ANALYSIS." EUREKA: Physics and Engineering, no. 6 (November 30, 2020): 108–22. https://doi.org/10.21303/2461-4262.2020.001538.

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This study presents a model to investigate the behavior of the single-phase turbulent flow at low to moderate Reynolds number of water through the vertical pipe through (2D) contour analysis. The model constructed based on governing equations of an incompressible Reynolds Average Navier-Stokes (RANS) model with (k-ε) method to observe the parametric determinations such as velocity profile, static pressure profile, turbulent kinetic energy consumption, and turbulence shear wall flows. The water is used with three velocities values obtained of (0.087, 0.105, and 0.123 m/s) to represent turbulent flow under low to moderate Reynolds number of the pipe geometry of (1 m) length with a (50.8 mm) inner diameter. The water motion behavior inside the pipe shows by using [COMSOL Multiphysics 5.4 and FLUENT 16.1] Software. It is concluded that the single-phase laminar flow of a low velocity, but obtained a higher shearing force; while the turbulent flow of higher fluid velocity but obtained the rate of dissipation of shearing force is lower than that for laminar flow. The entrance mixing length is affected directly with pattern of fluid flow. At any increasing in fluid velocity, the entrance mixing length is increase too, due to of fluid kinetic viscosity changes. The results presented the trends of parametric determinations variation through the (2D) counters analysis of the numerical model. When fluid velocity increased, the shearing force affected directly on the layer near-wall pipe. This leads to static pressure decreases with an increase in fluid velocities. While the momentum changed could be played interaction rules between the fluid layers near the wall pipe with inner pipe wall. Finally, the agreement between present results with the previous study of [1] is satisfied with the trend
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du Cluzeau, A., G. Bois, and A. Toutant. "Analysis and modelling of Reynolds stresses in turbulent bubbly up-flows from direct numerical simulations." Journal of Fluid Mechanics 866 (March 5, 2019): 132–68. http://dx.doi.org/10.1017/jfm.2019.100.

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Two-phase bubbly flows are found in many industrial applications. These flows involve complex local phenomena that are still poorly understood. For instance, two-phase turbulence modelling is still commonly based on single-phase flow analyses. A direct numerical simulation (DNS) database is described here to improve the understanding of two-phase turbulent channel flow at a parietal Reynolds number of 127. Based on DNS results, a physical interpretation of the Reynolds stress and momentum budgets is proposed. First, surface tension is found to be the strongest force in the direction of migration so that budgets of the momentum equations suggest a significant impact of surface tension in the migration process, whereas most modelling used in industrial application does not include it. Besides, the suitability of the design of our cases to study the interaction between bubble-induced fluctuations (BIF) and single-phase turbulence (SPT) is shown. Budgets of the Reynolds stress transport equation computed from DNS reveal an interaction between SPT and BIF, revealing weaknesses in the classical way in which pseudoturbulence and perturbations to standard single-phase turbulence are modelled. An SPT reduction is shown due to changes in the diffusion because of the presence of bubbles. An increase of the redistribution leading to a more isotropic SPT has been observed as well. BIF is comprised of a turbulent (wake-induced turbulence, WIT) and a non-turbulent (wake-induced fluctuations, WIF) part which are statistically independent. WIF is related to averaged wake and potential flow, whereas WIT appears when wakes become unstable or interact with each other for high-velocity bubbles. In the present low gravity conditions, BIF is reduced to WIF only. A thorough analysis of the transport equations of the Reynolds stresses is performed in order to propose an algebraic closure for the WIF towards an innovative two-phase turbulence model.
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Pérez, Tzayam, and José L. Nava. "Simulations of a Single-Phase Flow in a Compound Parabolic Concentrator Reactor." International Journal of Photoenergy 2018 (August 19, 2018): 1–8. http://dx.doi.org/10.1155/2018/2569251.

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This paper deals with the analysis and interpretation of flow visualization and residence time distribution (RTD) in a compound parabolic concentrator (CPC) reactor using computational fluid dynamics (CFD). CFD was calculated under turbulent flow conditions solving the Reynolds averaged Navier–Stokes (RANS) equation expressed in terms of turbulent viscosity and the standard k−ε turbulent model in 3D. A 3D diffusion-convection model was implemented in the CPC reactor to determine the RTD. The fluid flow visualization and RTD were validated with experimental results. The CFD showed that the magnitude of the velocity field remains almost uniform in most of the bulk reactor, although near and inside the 90° connectors and the union segments, the velocity presented low- and high-speed zones. Comparisons of theoretical and experimental RTD curves showed that the k−ε model is appropriate to simulate the nonideal flow inside the CPC reactor under turbulent flow conditions.
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Salhi, A., C. Rey, and J. M. Rosant. "Pressure Drop in Single-Phase and Two-Phase Couette-Poiseuille Flow." Journal of Fluids Engineering 114, no. 1 (1992): 80–84. http://dx.doi.org/10.1115/1.2910004.

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This paper is concerned with axial pressure gradient in single-phase and two-phase flow at low void fraction in a narrow annular space between two concentric cylinders, the inner one rotating. From experimental results, the coupling function (inertial forces/centrifugal forces) is parameterized by Taylor or Rossby numbers for two values of the intercylindrical width (clearance). The results are discussed with regard to different flow regimes and it is shown in particular that transition from the turbulent vorticed regime to the turbulent regime occurs at Ro ≃ 1. The proposed correlation agrees in a satisfactory manner to all the regimes studied in our experiments and in those given in the bibliography. In addition, original tests with a two-phase liquid/gas flow at 5 percent G.O.R. (gas oil ratio), for a finely dispersed gas phase are also reported. These results indicate a similar behavior to single-phase flows, justifying the transposition of the same correlation in the framework of the homogeneous model.
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Dissertations / Theses on the topic "Single-phase Turbulent Flow"

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Botne, Kjetil Kandal. "Modeling wax thickness in single-phase turbulent flow." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for petroleumsteknologi og anvendt geofysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19307.

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Oil and gas transport is today a vital part of the industry. Oil cooled during transport in pipelines may precipitate paraffin wax. Precipitated wax may deposit on pipe walls and cause flow restrictions. Deposition models are used to understand and predict deposition of solids. A deposition model can help predict wax problems before a pipe line is set into operation. If the amount of deposited wax is predicted it can help operators to develop removal plans and strategies. A total of 21 wax deposition experiments performed by others were digitized and evaluated. The logarithmic deposition-release model showed a good match with 18 of the experiments. The experiments tested the effect of varying flow rate, temperature or both. Most experiments behaved as expected when flow rate and temperature were varied. The deposition-release model consists of two coefficients, k1 and k2. Both coefficients were evaluated against wall shear stress for the varying rate experiments. The coefficients in the varying temperature series were evaluated against the temperature driving force. Linear trends between most coefficients and physical parameters were found. These linear trends lead to the development of four models that predict wax deposition. The models use either wall shear stress, the temperature driving force or both as an input. All models produce similar results. Each model was based on an experimental series. A study of a real pipeline with wax deposition was also investigated. Temperature and viscosity calculations matched well with values used in the study. The study reported calculated wax thickness based on measurements of pressure drop. The pressure drop method was evaluated and explained. The method does not consider an altered pressure drop due to increased pipe roughness and non-evenly distribution of deposits. Both of these effects will increase the pressure drop. It was found that neglecting these will cause the calculated thickness to be overestimated. Because of the overestimation of thickness it was hard to get an accurate match with models.
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Bolour-Froushan, Abol Hassan. "Prediction of single-phase turbulent flow in agitated mixing vessels." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/37946.

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Everts, Marilize. "Single-phase mixed convection of developing and fully developed flow in smooth horizontal tubes in the laminar, transitional, quasi-turbulent and turbulent flow regimes." Thesis, University of Pretoria, 2017. http://hdl.handle.net/2263/64045.

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The laminar and turbulent flow regimes have been extensively investigated from as early as 1883, and research has been devoted to the transitional flow regime since the 1990s. However, there are several gaps in the mixed convection literature, especially when the flow is still developing. The purpose of the study was to experimentally investigate the heat transfer and pressure drop characteristics of developing and fully developed flow of low Prandtl number fluids in smooth horizontal tubes for forced and mixed convection conditions. An experimental set-up was designed and built, and results were validated against literature. Two smooth circular test sections with inner diameters of 4 mm and 11.5 mm were used, and the maximum length-to-diameter ratios were 1 373 and 872 respectively. Heat transfer measurements were taken at Reynolds numbers between 500 and 10 000 at different constant heat fluxes. A total of 648 mass flow rate measurements, 70 301 temperature measurements and 2 536 pressure drop measurements were taken. Water was used as the test fluid and the Prandtl number ranged between 3 and 7. It was found that a longer thermal entrance length was required for simultaneously hydrodynamically and thermally developing flow. Therefore, a coefficient of at least 0.12 (and not 0.05 as advised in most literature) was suggested. Because free convection effects decreased the thermal entrance length, correlations were also developed to calculate the thermal entrance length for mixed convection conditions. The boundaries between the flow regimes were defined mathematically, and terminology to define transitional flow characteristics was presented. For laminar flow, three different regions (forced convection developing, mixed convection developing and fully developed) were identified in the local heat transfer results and nomenclature and correlations were developed to define and quantify the boundaries of these regions. Correlations were also developed to calculate the local and average laminar Nusselt numbers of mixed convection developing flow. The laminar-turbulent transition along the tube length occurred faster with increasing Reynolds number, and was also influenced by free convection effects. As free convection effects became significant, the effect was first to disrupt the fluctuations inside the test section, leading to a slower laminar-turbulent transition along the tube length compared with forced convection conditions. However, as free convection effects were increased, the fluctuations inside the test section increased and caused the laminar-turbulent transition along the tube length to occur faster. The Reynolds number at which transition started was found to be independent of axial position for both developing and fully developed flow. However, the end of transition occurred earlier as the flow approached fully developed flow. When the flow was fully developed, the end of transition became independent of axial position. Furthermore, free convection effects affected both the start and end of the transitional flow regime, and caused the Reynolds number range of the transitional flow regime to decrease. Correlations were therefore developed to determine the start and end of the transitional flow regime for developing and fully developed flow in mixed convection conditions. The transitional flow regime across the tube length was divided into three regions. In the first region, the width of the transitional flow regime decreased significantly with axial position as the thermal boundary layer thickness increased, and free convection effects were negligible. In Region 2, the width of the transitional flow regime decreased with axial position, due to the development of the thermal boundary layer, as well as with increasing free convection effects. In the fully developed region (Region 3), the width of the transitional flow regime was independent of axial position, but decreased significantly with increasing free convection effects. At high Grashof numbers, free convection effects even caused the transitional flow regime of fully developed flow to become negligible. It was found that the boundaries of the different flow regimes were the same for pressure drop and heat transfer, and a relationship between pressure drop and heat transfer existed in all four flow regimes. In the laminar flow regime, this relationship was a function of Grashof number (thus free convection effects), while it was a function of Reynolds number in the other three flow regimes. Correlations to predict the average Nusselt numbers, as well as the friction factors as a function of average Nusselt number, for developing and fully developed flow in all flow regimes were developed. Finally, flow regime maps were developed to predict the convection flow regime for developing and fully developed flow for a wide range of tube diameters and Prandtl numbers, and these flow regime maps were unique for four reasons. Firstly, they contained contour lines that showed the Nusselt number enhancements due to the free convection effects. Secondly, they were valid for a wide range of tube diameters and Prandtl numbers. Thirdly, the flow regime maps were developed as a function of temperature difference (Grashof number) and heat flux (modified Grashof number). Finally, four of the six flow regime maps were not only valid for fully developed flow, but also for developing flow.<br>Thesis (PhD)--University of Pretoria, 2017.<br>NRF<br>TESP<br>Stellenbosch University/University of Pretoria<br>SANERI/SANEDI<br>CSIR<br>EEDSM Hub<br>NAC<br>Mechanical and Aeronautical Engineering<br>PhD<br>Unrestricted
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Ritchie, John Murray. "Pressure loss and heat transfer for single-phase turbulent flow in tubes fitted with wire-matrix inserts." Thesis, University of Birmingham, 2009. http://etheses.bham.ac.uk//id/eprint/1228/.

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Heat transfer enhancement devices have become widely accepted as a method of enhancing exchanger performance and changing duties to either improve output or meet new operating requirements. hiTRAN® wire matrix inserts consist of a number of loops wound around a central core consisting of two intertwined wires. These inserts see a number of applications inside industrial tubular heat exchangers. They work by removing the laminar boundary layer that is often a dominant resistance to heat transfer, and mixing it with the core flow. This thesis presents research undertaken into the performance characteristics of hiTRAN® inserts in single-phase turbulent flow. Cal Gavin Limited, the company that manufactures these inserts, identified a need for reliable heat transfer and friction factor data within the turbulent flow regime. In order to meet this need, a test rig was commissioned in the form of a double-pipe heat exchanger. This exchanger was used in order to obtain performance data for a wide range of the sponsoring company’s most common insert geometries, placed inside a number of tubes, with diameters ranging from 10 mm to 13/8 inch. The heat transfer and pressure drop data obtained from the test rig were analysed and empirical correlations drawn to describe performance for varying loop densities for each tube and insert geometry. These data were further analysed against the existing semi-empirical theory concerning the use of roughness and geometry parameters to describe friction factor and heat transfer in systematically-roughened channels. The current research has shown that the friction factor correlations may be adapted to incorporate a logarithmic relationship on the ratio of hydraulic diameter to coil pitch, in order to effectively determine the friction factor of hiTRAN® inserts for which this ratio is between 1 and 8. This represents the range of inserts for which the sponsoring company are regularly required to provide thermal designs. The heat transfer performance is shown to be effectively described by the existing analogy between friction factor and heat transfer, as applied to systematically-roughened channels. This thesis also proposes a number of positive commercial implications of the determination of these correlations for the sponsoring company. As well as giving a number of accurate empirical relationships and presenting a semiempirical correlation for the description of performance of hiTRAN® inserts, this work also investigates the effect of a number of geometrical parameters upon insert performance. These qualitative analyses provide an indication of how the optimum coil diameter varies with loop density for a given insert geometry, as well as considering the effect of both the number of turns applied in intertwining the core wire during fabrication, and of the strength of fit that the insert makes with the tube wall. A constant pumping power comparison is also presented, which considers the ratio of heat transfer for the enhanced tube to the heat transfer that would have resulted from the fluid being pumped with the same power through a plain empty tube. This analysis indicates the presence of an optimum pitch to coil wire thickness ratio, the presence of which is substantiated by consideration of the laminar boundary layer behaviour around hiTRAN® inserts. Finally, suggestions are made for how these qualitative analyses may be developed by future experimentation into determining an optimised insert, along with other proposals for further work on the test rig.
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Lei, Chan Un. "Comparison of different correlating methods for the single-phase heat transfer data in laminar and turbulent flow regions." Thesis, University of Macau, 2010. http://umaclib3.umac.mo/record=b2493964.

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Banyai, Tamas. "Development of Stabilized Finite Element Method for Numerical Simulation of Turbulent Incompressible Single and Eulerian-Eulerian Two-Phase Flows." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/235110.

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The evolution of numerical methods and computational facilities allow re- searchers to explore complex physical phenomenons such as multiphase flows. The specific regime of incompressible, turbulent, bubbly two-phase flow (where a car- rier fluid is infused with bubbles or particles) is also receiving increased attention due to it’s appearance in major industrial processes. The main challenges arise from coupling individual aspects of the physics into a unified model and to provide a robust numerical framework. The presented work aimed at to achieve the second part by employing the most frequently used dispersed two-phase flow model and another incompressible, turbulent single phase solver as a base flow provider for coupled Lagrangian or surface tracking tools. Among the numerical techniques, the finite element method is a powerful can- didate when the need arises for multiphysics simulations (for example coupling with an electrochemical module) where the counterpart has a node based ap- proach. Stabilization schemes such as PSPG/SUPG/BULK provide remedies for the pressure decoupling and the inherent instability of the central discretization when applied for convective flow problems. As an alternative to unsteady solvers based upon an explicit or a fully im- plicit nonlinear treatment of the convective terms, a semi-implicit scheme results in a method of second order accurate in both space and time, has absolute linear stability and requires only a single or two linear system solution per time step. The application of the skew symmetric approach to the convective term further stabilizes the solution procedure and in some cases it even prevents divergence. The Eulerian-Eulerian two-phase flow model poses various issues to be over- come. The major difficulty is the density ratio between the phases; for an ordinary engineering problem it is in the order of thousands or more. The seemingly minus- cule differences in the formulation of the stabilizations can cause very different end results and require careful analysis. Volume fraction boundedness is of concern as well, but it is treatable by solving for its logarithm. Since the equations allow jumps (even separation of the phases) in the volume fraction field, discontinuity capturing techniques are also needed. Besides the standard ’spatial’ stabilization temporal smoothing is also necessary, otherwise the limitation in time step size becomes too stringent. Designing a flow solver is one side of the adventure, but verification is equally important. Comparison against analytical solution (such as the single and two- phase Taylor-Green testcase) provides insight and confirmation about the mathe- matical and physical properties. Meanwhile comparing with real life experiments prove the industrialization and usability of a code, dealing with low quality meshes and effective utilization of computer clusters.<br>Doctorat en Sciences de l'ingénieur et technologie<br>info:eu-repo/semantics/nonPublished
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Afshar, Mahmoud. "Numerical predictions of fully developed, turbulent, single-phase and bubbly two-phase flows in straight ducts." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq44338.pdf.

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Cheng, Liping. "Mathematical Modeling of Laminar and Turbulent Single-phase and Two-phase Flows in Straight and Helical Ducts." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-10312004-071502/.

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The purpose of this research is to investigate numerically the dynamics and heat transfer of laminar or turbulent flows in different media and complicated geometries, including the flow in a composite domain whose central portion is occupied by a clear fluid (turbulent flow) and whose peripheral portion is occupied by a fluid saturated porous medium (laminar flow); a laminar flow of a non-Newtonian fluid in a helical pipe; a laminar flow in a helical pipe filled with a fluid saturated porous medium; a two-phase laminar flow (non-Newtonian carrying fluid and solid particles) in a helical pipe. To model forced convection in a composite porous/fluid domain, the Brinkma-Forchheimer-extended Darcy equation is utilized for the porous region and a two-layer algebraic turbulence model is utilized for the flow in the central region. The effects of turbulence on velocity and temperature distributions as well as on the Nusselt number are analyzed. To investigate a fully developed laminar flow of a non-Newtonian fluid in a helical pipe, an orthogonal helical coordinate system is utilized and the Navier-Stokes and energy equations for the non-Newtonian fluid in this coordinate system are derived. The effects of the curvature and torsion of a helical pipe, the Dean number and Germano number on the velocities, secondary flow and heat transfer are presented. A full momentum equation for the flow in porous media that accounts for the Brinkman and Forchheimer extensions of the Darcy law as well as for the flow inertia is adopted to study the fully developed laminar flow in a helical pipe filled with a fluid saturated porous medium. The effects of the geometry of the helical pipe and the physical properties of the porous medium are investigated. Accounting for the flow inertia is shown to be important for predicting the secondary flow in a helical pipe. For 3D modeling of two-phase laminar flow in a helical pipe, the Eulerian approach is utilized for fluid flow and the Lagrangian approach is utilized for tracking particles. The interaction between the solid particles and the fluid that carries them is accounted for by a source term in the momentum equation for the fluid. The influence of inter-particle and particle-wall collisions is also taken into account.
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Rasthofer, Ursula [Verfasser], Volker [Akademischer Betreuer] Gravemeier, Volker [Akademischer Betreuer] John, and Wolfgang A. [Akademischer Betreuer] Wall. "Computational Multiscale Methods for Turbulent Single and Two-Phase Flows / Ursula Rasthofer. Gutachter: Volker John ; Wolfgang A. Wall ; Volker Gravemeier. Betreuer: Volker Gravemeier." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1074999436/34.

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Rasthofer, Ursula [Verfasser], Volker Akademischer Betreuer] Gravemeier, Volker [Akademischer Betreuer] [John, and Wolfgang A. [Akademischer Betreuer] Wall. "Computational Multiscale Methods for Turbulent Single and Two-Phase Flows / Ursula Rasthofer. Gutachter: Volker John ; Wolfgang A. Wall ; Volker Gravemeier. Betreuer: Volker Gravemeier." München : Universitätsbibliothek der TU München, 2015. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20150624-1237424-1-6.

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Books on the topic "Single-phase Turbulent Flow"

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1931-, Branover Herman, Lykoudis P. S. 1926-, Mond Michael, and American Institute of Aeronautics and Astronautics., eds. Single- and multi-phase flows in an electromagnetic field: Energy, metallurgical, and solar applications. American Institute of Aeronautics and Astronautics, 1985.

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Brankovic, Andreja *. Experimental and numerical study of turbulent recirculating single- and two-phase flows. 1987.

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Llor, Antoine. Statistical Hydrodynamic Models for Developed Mixing Instability Flows: Analytical "0D" Evaluation Criteria, and Comparison of Single-and Two-Phase Flow Approaches. Springer, 2014.

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Statistical Hydrodynamic Models for Developed Mixing Instability Flows: Analytical "0D" Evaluation Criteria, and Comparison of Single-and Two-Phase Flow Approaches (Lecture Notes in Physics). Springer, 2006.

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Negev), Bat-Sheva Seminar on MHD-flows and Turbulence (4th :. 1984 :. Ben-Gurion University of the, and Michael Mond. Single and Multi-Phase Flows in an Electromagnetic Field: Energy, Metallurgical, and Solar Applications (Progress in Astronautics and Aeronautics). AIAA (American Institute of Aeronautics & Ast, 1985.

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Book chapters on the topic "Single-phase Turbulent Flow"

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Laha, Sagar, Nitesh Mondal, Santosh Kumar Dash, and Prasun Dutta. "Flow Separation Analysis of Single-Phase Turbulent Flow Through Bend Pipe: A Computational Approach." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-7296-4_30.

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Deng, Xian-He, Yin-Ke Tan, and Song-Jiu Deng. "Investigation of the Correlations of Heat Transfer in Single and Multiple Start Spiral Tubes with Single-Phase Turbulent Flow for Fluid of Constant Physical Properties." In Heat Transfer Enhancement And Energy Conservation. CRC Press, 2024. http://dx.doi.org/10.1201/9781003575726-11.

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Postlethwaite, J., Y. Wang, G. Adamopoulos, and S. Nesic. "Relationship Between Modelled Turbulence Parameters and Corrosion Product Film Stability in Disturbed Single-Phase Aqueous Flow." In Modelling Aqueous Corrosion. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1176-8_14.

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"Single-Phase Turbulent Flow." In Fluid Dynamics of Particles, Drops, and Bubbles. Cambridge University Press, 2023. http://dx.doi.org/10.1017/9781139028806.007.

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Bentham Science Publisher, Bentham Science Publisher. "Large Eddy Simulation of Single-Phase Flow." In Stochastic Lagrangian Modeling for Large Eddy Simulation of Dispersed Turbulent Two-Phase Flows. BENTHAM SCIENCE PUBLISHERS, 2012. http://dx.doi.org/10.2174/978160805296711101010006.

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Echouchene, Fraj, and Hafedh Belmabrouk. "Analysis of Geometric Parameters of the Nozzle Orifice on Cavitating Flow and Entropy Production in a Diesel Injector." In Computational Fluid Dynamics [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.99404.

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In this chapter, we investigated the effect of geometric parameters of the nozzle orifice on cavitating flow and entropy production in a diesel injector. Firstly, we analyzed the effect of some parameters of diesel injector such as the nozzle length and the lip rounding on cavitating flow. In the second parts, we studied the entropy production inside the diesel injector in several cases: -single phase and laminar flow,- single phase and turbulent flow and –tubulent cavitating flow. In the last case, the mixture model cupled with k-ε turbulent model has been adopted. The effects of average inlet velocity and cavitation number on entropy production have been presented and discussed. The results obtained show that the discharge coefficient is weakly influenced by the length of the orifice and the radius of the wedge has a large effect on the intensity and distribution of cavitation along the injection nozzle. On the other hand, the study of entropy production inside the diesel injector shows that the entropy production is important near the wall and increases whith increasing the average inlet velocity and pressure injection.
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"Sensitivity of Turbulent Channel Flow to the Interactions at the Perimeter." In Single- and Multi-Phase Flows in an Electromagnetic Field: Energy, Metallurgical, and Solar Applications. American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/5.9781600865688.0202.0212.

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Boudraa, Bouziane, and Rachid Bessaïh. "Numerical Investigation of Turbulent Slot Jets with Various Nanoparticles Shapes." In Mechanical Engineering Technologies and Applications: Volume 2. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815124125123020003.

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In this work, a numerical investigation related to the turbulent forced convection of a water-Al2O3 nanofluid in slot jets impinging on multiple hot components fixed on the lower wall, using different nanoparticle shapes (spherical, blades, bricks, cylindrical and platelets), was carried out. The standard k-ε turbulence model with wall enhanced treatment and two-phase mixture model were used to analyze the fluid flow and heat transfer. The outcomes revealed that the increase in the Reynolds number (Re) and volume fraction of nanoparticles (φ) with all nanoparticle shapes enhanced the heat transfer rate. The platelets nanoparticle's shape significantly contributes to increasing the heat transfer rate compared with other forms. Also, we have found that the two-phase mixture model gives a higher average Nusselt number (Nu) values compared to the single-phase model, and the maximum values of (Nu)-is located around the last block due to the second jet's dominance (J2) compared to the first jet (J1). We have compared our results with those found in the literature.
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"Single Phase Laminar & Turbulent Flow Classification via a Knowledge-Based Linear Model." In Intelligent Engineering Systems through Artificial Neural Networks, Volume 16. ASME Press, 2006. http://dx.doi.org/10.1115/1.802566.paper89.

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"Investigation of the Turbulent Flow in an Induction Furnace Supplied with Various Frequencies." In Single- and Multi-Phase Flows in an Electromagnetic Field: Energy, Metallurgical, and Solar Applications. American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/5.9781600865688.0680.0693.

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Conference papers on the topic "Single-phase Turbulent Flow"

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Nesic, S., and J. Postlethwaite. "Erosion-Corrosion under Disturbed Flow Conditions in Slurry Pipelines." In CORROSION 1990. NACE International, 1990. https://doi.org/10.5006/c1990-90026.

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Abstract Flow dependent erosion-corrosion often occurs under disturbed flow conditions at geometrical irregularities such as fittings, valves and weld beads. Flow separation and reattachment produces high turbulence intensity and particle-wall interactions that can lead to high erosion-corrosion rates. This paper presents the predictions of 2-D turbulent, single and two-phase liquid/particle flow with recirculation, after a sudden constriction and expansion. The model is based on a two-phase flow version of a standard k —ϵ model of turbulence and a stochastic simulation of particle-fluid turbulence interactions. It is capable of successfully predicting local values of time averaged fluid velocities and turbulence intensities, as well as predicting particle dispersion, and particle-wall interaction. The numerical predictions of the flow structure are used to explain the results of an experimental erosion- corrosion study of a slurry flowing in a pipe with a sudden constriction and expansion. It is shown that in case of disturbed flow it is appropriate to correlate local near-wall parameters of flow with the metal loss rates. The simulations have shown that local near-wall intensity of turbulence is the important factor affecting mass transfer controlled corrosion in disturbed flow, rather than the wall shear stress. In case of pure corrosion, comparisons revealed a significant effect of local turbulence intensity on corrosion rate of the base metal. In case of erosion- corrosion, maximum metal loss coincided with local maximums of particle-wall mean impact frequency.
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Wang, Shihuai, and Srdjan Nesic. "On Coupling CO2 Corrosion and Multiphase Flow Models." In CORROSION 2003. NACE International, 2003. https://doi.org/10.5006/c2003-03631.

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Abstract Corrosion prediction in multiphase flow has been a challenging task in oil and gas industry for many years. Strictly speaking, the existing mechanistic CO2 corrosion models can only be used in single-phase flow. To add the capability of predicting corrosion in multiphase flow, the mass transfer and the turbulent diffusivity correlations in the models have to be modified to properly calculate the mass flux of corrosion species. An approach for establishing these correlations in different flow regimes is presented. The implementation of the method for stratified flow proves the feasibility of this proposal.
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Armfield, Mary V., Heather M. Langford, Donald E. Beasley, and Michael E. Conner. "Single-Phase Turbulent Rod Bundle Heat Transfer." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/htd-24116.

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Abstract The present study investigates single-phase heat transfer coefficients in a 5 × 5 horizontal rod bundle representing a water-cooled nuclear reactor. The rod bundle assembly consists of a square array of parallel rods held in place by support grids. Flow-enhancing features such as disc blockage or split-vane pairs are often added to the downstream edge of the support grids in an attempt to improve the heat transfer performance of the rod bundle assembly. The effects on the local heat transfer coefficients of several support grid designs are examined in the present study. The local, average heat transfer coefficients are measured using a heated copper sensor for standard, disc, and split-vane pair grid designs. In addition, lateral flow fields are obtained for the split-vane pair grid design using Particle Image Velocimetry (PIV) measurements. Results indicate that the local heat transfer coefficient is enhanced just downstream of the support grids. This enhancement decays to the fully-developed value of heat transfer by five hydraulic diameters downstream of the support grid for all of the grid designs. Heat transfer measurements of the split-vane pair grid design indicate a region of decreased heat transfer below the fully-developed value. Identification of swirl migration and weak exchange of fluid between subchannels in the lateral flow fields of the split-vane pair grid design provides insight into the decreased region of heat transfer.
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Celata, Gian Piero. "Single-Phase Heat Transfer and Fluid Flow in Micropipes." In ASME 2003 1st International Conference on Microchannels and Minichannels. ASMEDC, 2003. http://dx.doi.org/10.1115/icmm2003-1019.

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The objective of the present paper is to provide a general overview of the research carried out so far in single-phase heat transfer and flow in capillary (micro) pipes. Laminar flow and laminar-to-turbulent flow transition are analyzed in detail in order to clarify the discrepancies among the results obtained by different researchers. Experiments performed in the ENEA laboratory indicate that in laminar flow regime the friction factor is in good agreement with the Hagen-Poiseuille theory for Reynolds number below 600–800. For higher values of Reynolds number, experimental data depart from the Hagen-Poiseuille law to the side of higher f values. The transition from laminar-to-turbulent flow occurs for Reynolds number in the range 1800–2500. Heat transfer experiments show that heat transfer correlations in laminar and turbulent regimes, developed for conventional (macro) tubes, are not properly adequate for heat transfer rate prediction in microtubes.
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Troshko, Andrey A., and Yassin A. Hassan. "Boundary Layer Two-Phase Bubbly Flow Equation." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-1130.

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Abstract Experimental data indicate that bubbly, turbulent, boundary layer has the same structure as its single-phase counterpart. The modified logarithmic law of the wall for the bubbly turbulent log layer is obtained. Eddy viscosity concept is used to obtain boundary layer equation. Total turbulent stress in the inner layer is assumed to be the sum of the local stress caused by bubbles in the log layer and the stress taking into account the inherent liquid turbulence and bubble-liquid interaction in the outer layer. The proposed two-phase law of the wall can be used as a boundary condition in multidimensional models of two-phase turbulent flows. It is applicable to the upward and downward flows with the value of void fractions in the log layer not more than 10%.
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Liu, Dong, and Leyuan Yu. "Experimental Investigation of Single-Phase Convective Heat Transfer of Nanofluids in a Minichannel." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23018.

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Nanofluids have been proposed as a promising candidate for advanced heat transfer fluids in a variety of important engineering applications. A consensus is now lacking on if and how the dispersed nanoparticles alter the thermal transport in convective flows. An experimental investigation was conducted to study single-phase forced convection of Al2O3-water nanofluid in a circular minichannel. The friction factor and convection heat transfer coefficients were measured for nanofluids of various volume concentrations (up to 5%) and were compared to these of the base fluid. The Reynolds number varied from 600 to 4500, covering the laminar, transition and early fully developed turbulent regions. It was found that the nanofluids exhibit pronounced entrance region behaviors in the laminar region. In the transition and turbulent regions, the onset of transition to turbulence is delayed in nanofluids. Further, both the friction factor and convective heat transfer coefficient are below these of water at the same Re in the transition flow. Once fully developed turbulence is established, the difference in the flow and heat transfer of nanofluids and water will diminish. A scaling analysis showed these behaviors may be attributed to the variation in the relative size of nanoparticle with respect to the turbulent microscales. This work suggests that the particle-fluid interaction has a significant impact on the flow physics of nanofluids, especially in the transition and turbulent regions. Consequently, nanofluids should be used in either the laminar flow or fully developed turbulent flow at sufficiently high Re in order to yield enhanced heat transfer performance.
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Chung, Peter M. Y., Masahiro Kawaji, and Akimaro Kawahara. "Characteristics of Single-Phase Flow in Microchannels." In ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31211.

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Experiments were performed to study the flow behaviour of de-ionized water and nitrogen gas through round capillary rubes having an inner diameter of 100µm. At steady state, the single-phase pressure drop along the glass microchannel was measured and analysed. To compare with conventional flow theory, an evaluation was made of the friction factor constant for laminar flow and critical Reynolds number for the transition from laminar to turbulent flow. The liquid flow data were well predicted by the conventional friction factor equations for larger channels, and the critical Reynolds number was close to the traditional macro-scale value. For single-phase gas flow, the measured friction factors were found to agree with theory if compressibility effects are taken into account. The addition of compressibility yields a non-linear pressure distribution that arises from the density change of the gas in the channel. Unlike liquid flow in microchannels, the gas friction factor constant depends on the Reynolds number, which changes along the channel length. Moreover, compressibility caused the velocity to vary all along the length of the channel and prevented the flow from being fully-developed. The neglect of the slip-flow boundary condition and compressibility may account for the discrepancy between the experimental results of various researchers.
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Bucci, A., G. P. Celata, M. Cumo, E. Serra, and G. Zummo. "Water Single-Phase Fluid Flow and Heat Transfer in Capillary Tubes." In ASME 2003 1st International Conference on Microchannels and Minichannels. ASMEDC, 2003. http://dx.doi.org/10.1115/icmm2003-1037.

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This paper reports the results of an experimental investigation of fluid flow and single-phase heat transfer of water in stainless steel capillary tubes. Three tube diameters are tested: 172 μm, 290 μm and 520 μm, while the Reynolds number varying from 200 up to 6000. Fluid flow experimental results indicate that in laminar flow regime the friction factor is in good agreement with the Hagen-Poiseuille theory for Reynolds number below 800–1000. For higher values of Reynolds number, experimental data depart from the Hagen-Poiseuille law to the side of higher f values. The transition from laminar to turbulent regime occurs for Reynolds number in the range 1800–3000. This transition is found in good agreement with the well known flow transition for rough commercial tubes. Heat transfer experiments show that heat transfer correlations in laminar and turbulent regimes, developed for conventional size tubes, are not adequate for calculation of heat transfer coefficient in microtubes. In laminar flow the experimental values of heat transfer coefficient are generally higher than those calculated with the classical correlation, while in turbulent flow regime experimental data do not deviate significantly from classical heat transfer correlations. Deviation from classical heat transfer correlations increase as the channel diameter decrease.
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Qiu, Suizheng, Minoru Takahashi, Guanghui Su, and Dounan Jia. "Experimental Study on Heat Transfer of Single-Phase Flow and Boiling Two-Phase Flow in Vertical Narrow Annuli." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22212.

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Water single-phase and nucleate boiling heat transfer were experimentally investigated in vertical annuli with narrow gaps. The experimental data about water single-phase flow and boiling two-phase flow heat transfer in narrow annular channel were accumulated by two test sections with the narrow gaps of 1.0mm and 1.5mm. Empirical correlations to predict the heat transfer of the single-phase flow and boiling two-phase flow in the narrow annular channel were obtained, which were arranged in the forms of the Dittus-Boelter for heat transfer coefficients in a single-phase flow and the Jens-Lottes formula for a boiling two-phase flow in normal tubes, respectively. The mechanism of the difference between the normal channel and narrow annular channel were also explored. From experimental results, it was found that the turbulent heat transfer coefficients in narrow gaps are nearly the same to the normal channel in the experimental range, and the transition Reynolds number from a laminar flow to a turbulent flow in narrow annuli was much lower than that in normal channel, whereas the boiling heat transfer in narrow annular gap was greatly enhanced compared with the normal channel.
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Stanley, Roger S., Randall F. Barron, and Tim A. Ameel. "Two-Phase Flow in Microchannels." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0952.

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Abstract As the field of microfluidics continues to grow, it is becoming increasingly important to understand the mechanisms involved with heat transfer in two-phase flow through microgeometries. This importance is reiterated by the increasing number of applications which use phase change as the principal mechanism to conduct or remove heat. The purpose of this study was to investigate fluid mechanic and heat transfer characteristics of two-phase two-component flow in rectangular microchannels. Experiments were conducted using rectangular aluminum channels with hydraulic diameters ranging between 56 μm and 256 μm and aspect ratios which varied from 0.5 to 1.5. Both single- and two-phase tests yielded excellent correlations of the friction factor. Reynolds number and the combination of Reynolds number and Prandtl number were the dominant parameters in the prediction of pressure drop and heat transfer rate, respectively. The pressure drop predictions, based on available semi-empirical relations for two-phase flows, were shown to substantially over predict the measured pressure drop. Other findings showed that for single-phase flow, the transition from laminar to turbulent regimes of the friction factor was suppressed as the channel hydraulic diameter decreased. Two-phase friction factor data indicated a definite transition from laminar to turbulent regimes at a Reynolds number of 3,000 for all channel configurations tested. It is believed that the transition was due to the intense pressure fluctuations associated with two-phase flows. In both single- and two-phase experiments, Nusselt number data exhibited a trend similar to the macroscale turbulent regime correlations; however, the data were somewhat less than the macroscale predictions. In contrast to the friction factor data, both single- and two-phase Nusselt number data suggested no change in flow regimes occurred.
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Reports on the topic "Single-phase Turbulent Flow"

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Alexander and Kiefner. L51554 Field Observations on the Two-Phase Hovenweep CO2 Gathering System During Summer Operation. Pipeline Research Council International, Inc. (PRCI), 1988. http://dx.doi.org/10.55274/r0010290.

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While laboratory-scale studies of single-phase flow have resulted in good correlations for the design of large-diameter pipeline systems, similar approaches for two-phase flow have not been as useful. Although theoretical modeling and simulation of single-phase turbulent flow has not yet been accomplished, empirical observation of many small-scale examples has lead to effective correlations through dimensional analysis. These correlations for a single-phase often do scale-up adequately for design of pipelines. However, when an additional phase is present, this approach has not worked well. It is likely that a better understanding of the fundamental interaction of two-turbulent phases will be necessary if small-scale studies are to be used for the design of large, high-pressure pipeline systems. A more immediate way of gaining some knowledge of two-phase flow in large diameter pipes of the complexity present in the field is to over-design a pipeline system and construct it, field tune it to specifications, then observe its behavior. This is obviously a risky and expensive approach. However, many such systems have been constructed. It is on these successful two-phase pipeline systems that our attention should be focused in the immediate future if we are to improve two-phase pipeline design now of new but similar systems. Such is the focus of this study of the Hovenweep CO2 Gathering System. The Hovenweep CO2 Gathering System was selected for study as a pipeline system that could add to the knowledge of the nature of steady-state two-phase flow in large diameter high pressure pipeline systems with hilly terrain. Characterization includes measurement of the following variables: 1. gas and liquid flow rates; 2. typical gas and liquid compositions; 3. liquid volume fractions; 4. pressure drop across each test segment; 5. temperature.
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Tryggvason, Gretar, Igor Bolotnov, Jun Fang, and Jiacai Lu. Verification of bubble tracking method and DNS examinations of single- and two-phase turbulent channel flows. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1409272.

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