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Relevant bibliographies by topics / Laminar flow. Fluid dynamics. Two-phase flow

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Academic literature on the topic 'Laminar flow. Fluid dynamics. Two-phase flow'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Laminar flow. Fluid dynamics. Two-phase flow"

1

Chauchat, Julien, Zhen Cheng, Tim Nagel, Cyrille Bonamy, and Tian-Jian Hsu. "SedFoam-2.0: a 3-D two-phase flow numerical model for sediment transport." Geoscientific Model Development 10, no. 12 (2017): 4367–92. http://dx.doi.org/10.5194/gmd-10-4367-2017.

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Abstract. In this paper, a three-dimensional two-phase flow solver, SedFoam-2.0, is presented for sediment transport applications. The solver is extended from twoPhaseEulerFoam available in the 2.1.0 release of the open-source CFD (computational fluid dynamics) toolbox OpenFOAM. In this approach the sediment phase is modeled as a continuum, and constitutive laws have to be prescribed for the sediment stresses. In the proposed solver, two different intergranular stress models are implemented: the kinetic theory of granular flows and the dense granular flow rheology μ(I). For the fluid stress, laminar or turbulent flow regimes can be simulated and three different turbulence models are available for sediment transport: a simple mixing length model (one-dimensional configuration only), a k − ε, and a k − ω model. The numerical implementation is demonstrated on four test cases: sedimentation of suspended particles, laminar bed load, sheet flow, and scour at an apron. These test cases illustrate the capabilities of SedFoam-2.0 to deal with complex turbulent sediment transport problems with different combinations of intergranular stress and turbulence models.

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Siddiqa, Sadia, M. N. Abrar, M. A. Hossain, and M. Awais. "Dynamics of Two-Phase Dusty Fluid Flow Along a Wavy Surface." International Journal of Nonlinear Sciences and Numerical Simulation 17, no. 5 (2016): 185–93. http://dx.doi.org/10.1515/ijnsns-2015-0044.

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AbstractThis article provides the computational results of laminar, boundary layer flow of a dilute gas-particle mixture over a semi-infinite vertical wavy surface. The governing parabolic partial differential equations are switched into another frame of reference by using primitive variable formulations (PVF). Two-point finite difference scheme is applied to acquire the unknown quantities of the carrier and the particle phase. The results are obtained for the cases: (i) water–metal mixture and (ii) air–metal mixture and are displayed in the form of wall shear stress, wall heat transfer, velocity profile, temperature profile, streamlines and isotherms for different emerging physical parameters. The solutions are compared, as well, with the available data in the literature. Quantitative comparison shows good compatibility between the present and the previous results. For the dusty fluid model it is found that the rate of heat transfer reduces considerably when the amplitude of the sinusoidal waveform increases from 0 to 0.5.

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OURIEMI, MALIKA, PASCALE AUSSILLOUS, and ÉLISABETH GUAZZELLI. "Sediment dynamics. Part 1. Bed-load transport by laminar shearing flows." Journal of Fluid Mechanics 636 (September 25, 2009): 295–319. http://dx.doi.org/10.1017/s0022112009007915.

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We propose a two-phase model having a Newtonian rheology for the fluid phase and friction for the particle phase to describe bed-load transport in the laminar viscous regime. We have applied this continuum model to sediment transport by viscous shearing flows. The equations are shown to reduce to the momentum equation for the mixture and the Brinkman equation for the fluid velocity. This modelling is able to provide a description of the flow of the mobile granular layer. At some distance from threshold of particle motion, where the continuum approach is more realistic as the mobile layer is larger than one particle diameter, there is very little slip between the two phases and the velocities inside the mobile bed have approximately a parabolic profile. When the Poiseuille (or Couette) flow is not significantly perturbed, simple analytical results of the particle flux varying cubically with the Shields number and of the bed-load thickness varying linearly with it can then be obtained. These predictions compare favourably with experimental observations of bed-load transport in pipe flows.

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Huang, Yuanlong, Matthew M. Coggon, Ran Zhao, et al. "The Caltech Photooxidation Flow Tube reactor: design, fluid dynamics and characterization." Atmospheric Measurement Techniques 10, no. 3 (2017): 839–67. http://dx.doi.org/10.5194/amt-10-839-2017.

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Abstract. Flow tube reactors are widely employed to study gas-phase atmospheric chemistry and secondary organic aerosol (SOA) formation. The development of a new laminar-flow tube reactor, the Caltech Photooxidation Flow Tube (CPOT), intended for the study of gas-phase atmospheric chemistry and SOA formation, is reported here. The present work addresses the reactor design based on fluid dynamical characterization and the fundamental behavior of vapor molecules and particles in the reactor. The design of the inlet to the reactor, based on computational fluid dynamics (CFD) simulations, comprises a static mixer and a conical diffuser to facilitate development of a characteristic laminar flow profile. To assess the extent to which the actual performance adheres to the theoretical CFD model, residence time distribution (RTD) experiments are reported with vapor molecules (O3) and submicrometer ammonium sulfate particles. As confirmed by the CFD prediction, the presence of a slight deviation from strictly isothermal conditions leads to secondary flows in the reactor that produce deviations from the ideal parabolic laminar flow. The characterization experiments, in conjunction with theory, provide a basis for interpretation of atmospheric chemistry and SOA studies to follow. A 1-D photochemical model within an axially dispersed plug flow reactor (AD-PFR) framework is formulated to evaluate the oxidation level in the reactor. The simulation indicates that the OH concentration is uniform along the reactor, and an OH exposure (OHexp) ranging from ∼ 109 to ∼ 1012 molecules cm−3 s can be achieved from photolysis of H2O2. A method to calculate OHexp with a consideration for the axial dispersion in the present photochemical system is developed.

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Banerjee, R., K. M. Isaac, L. Oliver, and W. Breig. "Features of Automotive Gas Tank Filler Pipe Two-Phase Flow: Experiments and Computational Fluid Dynamics Simulations." Journal of Engineering for Gas Turbines and Power 124, no. 2 (2002): 412–20. http://dx.doi.org/10.1115/1.1445439.

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Extensive flow visualization in an automotive fuel filler pipe made visible by introducing dyes and smoke in water and air, respectively, were conducted for nominal flow rates of 4–18 liters per minute. Video and still cameras were used for imaging. Features of the flow such as laminar-to-turbulent transition, progressive development of strong swirl along filler pipe axis, air entrainment, and mixing with the liquid were observed in the experiments. The experimental observations were supported by computational fluid dynamics (CFD) simulations of the flow which also showed features such as swirl and air entrainment.

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BÉG, O. ANWAR, M. M. RASHIDI, M. AKBARI, and A. HOSSEINI. "COMPARATIVE NUMERICAL STUDY OF SINGLE-PHASE AND TWO-PHASE MODELS FOR BIO-NANOFLUID TRANSPORT PHENOMENA." Journal of Mechanics in Medicine and Biology 14, no. 01 (2014): 1450011. http://dx.doi.org/10.1142/s0219519414500110.

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A computational fluid dynamics (CFD) simulation of laminar convection of Al 2 O 3–water bio-nanofluids in a circular tube under constant wall temperature conditions was conducted, employing a single-phase model and three different two-phase models (volume of fluid (VOF), mixture and Eulerian). The steady-state, three-dimensional flow conservation equations were discretised using the finite volume method (FVM). Several parameters such as temperature, flow field, skin friction and heat transfer coefficient were computed. The computations showed that CFD predictions with the three different two-phase models are essentially the same. The CFD simulations also demonstrated that single-phase and two-phase models yield the same results for fluid flow but different results for thermal fields. The two-phase models, however, achieved better correlation with experimental measurements. The simulations further showed that heat transfer coefficient distinctly increases with increasing nanofluid particle concentration. The physical properties of the base fluid were considered to be temperature-dependent, while those of the solid particles were constant. Grid independence tests were also included. The simulations have applications in novel biomedical flow processing systems.

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Boutopoulos, Ioannis D., Dimitrios S. Lampropoulos, George C. Bourantas, Karol Miller, and Vassilios C. Loukopoulos. "Two-Phase Biofluid Flow Model for Magnetic Drug Targeting." Symmetry 12, no. 7 (2020): 1083. http://dx.doi.org/10.3390/sym12071083.

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Magnetic drug targeting (MDT) is a noninvasive method for the medical treatment of various diseases of the cardiovascular system. Biocompatible magnetic nanoparticles loaded with medicinal drugs are carried to a tissue target in the human body (in vivo) under the applied magnetic field. The present study examines the MDT technique in various microchannels geometries by adopting the principles of biofluid dynamics (BFD). The blood flow is considered as laminar, pulsatile and the blood as an incompressible and non-Newtonian fluid. A two-phase model is adopted to resolve the blood flow and the motion of magnetic nanoparticles (MNPs). The numerical results are obtained by utilizing a meshless point collocation method (MPCM) alongside with the moving least squares (MLS) approximation. The numerical results are verified by comparing with published numerical results. We investigate the effect of crucial parameters of MDT, including (1) the volume fraction of nanoparticles, (2) the location of the magnetic field, (3) the strength of the magnetic field and its gradient, (4) the way that MNPs approach the targeted area, and (5) the bifurcation angle of the vessel.

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Wassar, Taoufik, Matthew A. Franchek, Hamdi Mnasri, and Yingjie Tang. "An Explicit Analytical Solution for Transient Two-Phase Flow in Inclined Fluid Transmission Lines." Fluids 6, no. 9 (2021): 300. http://dx.doi.org/10.3390/fluids6090300.

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Due to the complex nonlinearity characteristics, analytical modeling of compressible flow in inclined transmission lines remains a challenge. This paper proposes an analytical model for one-dimensional flow of a two-phase gas-liquid fluid in inclined transmission lines. The proposed model is comprised of a steady-state two-phase flow mechanistic model in-series with a dynamic single-phase flow model. The two-phase mechanistic model captures the steady-state pressure drop and liquid holdup properties of the gas-liquid fluid. The developed dynamic single-phase flow model is an analytical model comprised of rational polynomial transfer functions that are explicitly functions of fluid properties, line geometry, and inclination angle. The accuracy of the fluid resonant frequencies predicted by the transient flow model is precise and not a function of transmission line spatial discretization. Therefore, model complexity is solely a function of the number of desired modes. The dynamic single-phase model is applicable for under-damped and over-damped systems, laminar, and turbulent flow conditions. The accuracy of the overall two-phase flow model is investigated using the commercial multiphase flow dynamic code OLGA. The mean absolute error between the two models in step response overshoot and settling time is less than 8% and 2 s, respectively.

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Luan, Zhaogao, and M. M. Khonsari. "Computational Fluid Dynamics Analysis of Turbulent Flow Within a Mechanical Seal Chamber." Journal of Tribology 129, no. 1 (2006): 120–28. http://dx.doi.org/10.1115/1.2401220.

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Turbulent flow inside the seal chamber of a pump operating at high Reynolds number is investigated. The K−ε turbulence model posed in cylindrical coordinates was applied for this purpose. Simulations are performed using the fractional approach method. The results of the computer code are verified by using the FLUENT and by comparing to published results for turbulent Taylor Couette flow. Numerical results of four cases including two rotational speeds with four flush rates are reported. Significant difference between the laminar and the turbulence flow in the seal chamber is predicted. The behavior of the turbulent flows with very high Reynolds number was also investigated. The physical and practical implications of the results are discussed.

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Hasslberger, Josef, Sebastian Ketterl, Markus Klein, and Nilanjan Chakraborty. "Flow topologies in primary atomization of liquid jets: a direct numerical simulation analysis." Journal of Fluid Mechanics 859 (November 26, 2018): 819–38. http://dx.doi.org/10.1017/jfm.2018.845.

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The local flow topology analysis of the primary atomization of liquid jets has been conducted using the invariants of the velocity-gradient tensor. All possible small-scale flow structures are categorized into two focal and two nodal topologies for incompressible flows in both liquid and gaseous phases. The underlying direct numerical simulation database was generated by the one-fluid formulation of the two-phase flow governing equations including a high-fidelity volume-of-fluid method for accurate interface propagation. The ratio of liquid-to-gas fluid properties corresponds to a diesel jet exhausting into air. Variation of the inflow-based Reynolds number as well as Weber number showed that both these non-dimensional numbers play a pivotal role in determining the nature of the jet break-up, but the flow topology behaviour appears to be dominated by the Reynolds number. Furthermore, the flow dynamics in the gaseous phase is generally less homogeneous than in the liquid phase because some flow regions resemble a laminar-to-turbulent transition state rather than fully developed turbulence. Two theoretical models are proposed to estimate the topology volume fractions and to describe the size distribution of the flow structures, respectively. In the latter case, a simple power law seems to be a reasonable approximation of the measured topology spectrum. According to that observation, only the integral turbulent length scale would be required as an input for the a priori prediction of the topology size spectrum.

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Dissertations / Theses on the topic "Laminar flow. Fluid dynamics. Two-phase flow"

1

Galambos, Paul C. "Two-phase dispersion in micro-channels /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/7100.

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Mitchell, Radford. "Transition to turbulence and mixing in a quasi-two-dimensional Lorentz force-driven Kolmogorov flow." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49045.

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The research in this thesis was motivated by a desire to understand the mixing properties of quasi-two-dimensional flows whose time-dependence arises naturally as a result of fluid-dynamic instabilities. Additionally, we wished to study how flows such as these transition from the laminar into the turbulent regime. This thesis presents a numerical and theoretical investigation of a particular fluid dynamical system introduced by Kolmogorov. It consists of a thin layer of electrolytic fluid that is driven by the interaction of a steady current with a magnetic field produced by an array of bar magnets. First, we derive a theoretical model for the system by depth-averaging the Navier-Stokes equation, reducing it to a two-dimensional scalar evolution equation for the vertical component of vorticity. A code was then developed in order to both numerically simulate the fluid flow as well as to compute invariant solutions. As the strength of the driving force is increased, we find a number of steady, time-periodic, quasiperiodic, and chaotic flows as the fluid transitions into the turbulent regime. Through long-time advection of a large number of passive tracers, the mixing properties of the various flows that we found were studied. Specifically, the mixing was quantified by computing the relative size of the mixed region as well as the mixing rate. We found the mixing efficiency of the flow to be a non-monotonic function of the driving current and that significant changes in the flow did not always lead to comparable changes in its transport properties. However, some very subtle changes in the flow dramatically altered the degree of mixing. Using the theory of chaos as it applies to Hamiltonian systems, we were able to explain many of our results.

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Abbasi, Baharanchi Ahmadreza. "Development of a Two-Fluid Drag Law for Clustered Particles Using Direct Numerical Simulation and Validation through Experiments." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2489.

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This dissertation focused on development and utilization of numerical and experimental approaches to improve the CFD modeling of fluidization flow of cohesive micron size particles. The specific objectives of this research were: (1) Developing a cluster prediction mechanism applicable to Two-Fluid Modeling (TFM) of gas-solid systems (2) Developing more accurate drag models for Two-Fluid Modeling (TFM) of gas-solid fluidization flow with the presence of cohesive interparticle forces (3) using the developed model to explore the improvement of accuracy of TFM in simulation of fluidization flow of cohesive powders (4) Understanding the causes and influential factor which led to improvements and quantification of improvements (5) Gathering data from a fast fluidization flow and use these data for benchmark validations. Simulation results with two developed cluster-aware drag models showed that cluster prediction could effectively influence the results in both the first and second cluster-aware models. It was proven that improvement of accuracy of TFM modeling using three versions of the first hybrid model was significant and the best improvements were obtained by using the smallest values of the switch parameter which led to capturing the smallest chances of cluster prediction. In the case of the second hybrid model, dependence of critical model parameter on only Reynolds number led to the fact that improvement of accuracy was significant only in dense section of the fluidized bed. This finding may suggest that a more sophisticated particle resolved DNS model, which can span wide range of solid volume fraction, can be used in the formulation of the cluster-aware drag model. The results of experiment suing high speed imaging indicated the presence of particle clusters in the fluidization flow of FCC inside the riser of FIU-CFB facility. In addition, pressure data was successfully captured along the fluidization column of the facility and used as benchmark validation data for the second hybrid model developed in the present dissertation. It was shown the second hybrid model could predict the pressure data in the dense section of the fluidization column with better accuracy.

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Kunda, Wilkinson. "Two phase problems and two phase flow." Thesis, University of Hull, 1986. http://hydra.hull.ac.uk/resources/hull:5902.

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In section 1 of this thesis a two-dimensional mathematical model is used to investigate the circulation in a gas-bubble agitation system of a cylindrical vessel for the case of an orifice located at the centre of the base. The two-phase (liquid/gas) region is assumed to be confined to a cone-shaped region and is investigated using Wallis' Drift Flux Model. In the single-phase (liquid) region the turbulent Navier-Stokes equations, written in terms of the stream function, are used for the mathematical model. The analysis in the two-phase region yields the boundary conditions on the two-phase/single-phase boundary. The velocity field in the two-phase region is solved analytically giving results in closed form. A numerical algorithm is developed for calculating liquid flow in the single phase region, and numerical results are presented graphically in terms of the stream function. In section 2 two moving interface problems are investigated. Small time analytic solutions are found for three-dimensional inward solidification of a half space initially at fusion temperature in the first problem. In the second problem, perturbation solutions for melting of a cylindrical annulus with constant heat flux on inner surface are given. In both problems the interface immobilization technique is used. Interface locations at various times are calculated for the inward solidification problem and the results shown in three-dimensional graphs. First and second perturbation terms for the interface location are given for the second problem and graphs of each are presented for a particular case.

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Ekberg, Nathanial Paul. "Two-phase flow in horizontal thin annuli." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17250.

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Bykalyuk, Anna. "Contribution à l'étude des échanges convectifs à l'interface fluide paroi en présence de matériaux à changement de phase : Application au bâtiment." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0132/document.

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De récentes études expérimentales ont montré que les valeurs usuelles du coefficient d’échange convectif sont différentes en présence de matériaux à changement de phase. Cette thèse de doctorat porte sur l'étude numérique des échanges convectifs fluide/paroi dans une cavité ouverte en régime dynamique. Plus précisément, les parois étudiées sont une paroi avec une capacité thermique et une paroi qui contient des matériaux à changement de phase. Trois modèles distincts ont été développés. Dans un premier temps un modèle (modèle 1) qui concerne l’interaction fluide-paroi à la surface d’une paroi résistive (temperature imposée) en régime laminaire stationnaire a été développé et validé. Les résultats ont été confrontés avec la littérature. Ensuite, les échanges convectifs à la surface d’une plaque capacitive (modèle 2) soumise à une rampe de température d’air ont été étudiés. Finalement, un troisième modèle (modèle 3) a été développé, à la suite du modèle 2. Ce dernier modèle concerne l’interaction fluide-paroi à la surface d’une paroi contenant des matériaux à changement de phase en régime dynamique. Les résultats obtenus révèlent des pics locaux du flux de chaleur au cours du temps. Ce fait témoigne du changement d’état à l’intérieur de la paroi qui contient le materiau à changement de phase. De plus, les courbes des coefficients d’échanges convectifs moyens révèlent la dépendance du coefficient d’echange convectif à la capacité thermique du materiau. Par conséquent, la présence des matériaux à changement de phase à l’intérieur d'une paroi influence l’évolution et la forme de la couche limite thermique<br>Recent experimental studies have shown that the usual values of the convective heat transfer coefficient h are no longer valid in the presence of phase change materials. Three separate models were developed. Initially a model 1 which treats the fluid-wall (constant temperature) interaction in steady laminar flow has been developed and validated. Then, the wall with heat capacity (model 2) subjected to an air temperature ramp were studied. Finally, a third model (3) has been developed which treats the interaction fluid-wall which contains a phase change material. The results show local peaks of heat flow over time. This fact reflects the phase change inside the wall. Moreover, the curves of the convective heat transfer coefficient indicate the dependence of the coefficient h to the wall’s energy storage capacity. Therefore, the presence of the phase change materials within a wall effect and changes the shape of the thermal boundary layer

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Woodley, Caroline Jane. "Thermodynamic reduction techniques in two-phase hydrocarbon pipeline flow simulation." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294785.

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Zheng, Guohua. "Two-phase slug flow in hilly terrain pipelines /." Access abstract and link to full text, 1991. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9201599.

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Stinson, Michael J. "Interphase transfer processes in cocurrent two phase channel flow." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/17215.

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Triplett, Kimberly Ann. "Two-phase flow regime maps and pressure drop in microchannels." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/16867.

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Books on the topic "Laminar flow. Fluid dynamics. Two-phase flow"

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Hicks, R. M. An evaluation of three two-dimensional computational fluid dynamics codes including low Reynolds numbers and transonic Mach numbers. Ames Research Center, 1991.

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Papageorgiou, D. T. The stability of two-dimensional wakes and shear-layers at high Mach numbers. National Aeronautics and Space Administration, Langley Research Center, 1990.

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Ishii, M. Thermo-fluid dynamics of two-phase flow. 2nd ed. Springer, 2011.

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Ishii, Mamoru, and Takashi Hibiki. Thermo-Fluid Dynamics of Two-Phase Flow. Springer US, 2006. http://dx.doi.org/10.1007/978-0-387-29187-1.

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Ishii, Mamoru, and Takashi Hibiki. Thermo-Fluid Dynamics of Two-Phase Flow. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-7985-8.

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Particulates and continuum: Multiphase fluid dynamics. Hemisphere Pub. Corp., 1989.

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Peker, Sümer M. Solid-liquid two phase flow. Elsevier, 2008.

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Hoomans, Bob Petrus Bernardus. Granular dynamics of gas-solid two-phase flows. B.P.B. Hoomans, 1999.

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Ghiaasiaan, Mostafa. Gas-liquid two-phase flow: Boiling and condensation in conventional, mini and micro systems. Cambridge University Press, 2007.

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International Symposium on Liquid-Solid Flows. (3rd 1988 Chicago, Ill.). Third international symposium on liquid-solid flows. American Society of Mechanical Engineers, 1988.

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Book chapters on the topic "Laminar flow. Fluid dynamics. Two-phase flow"

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Maćkowiak, Jerzy. "Two-Phase Flow and Operating Range." In Fluid Dynamics of Packed Columns. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/b98397_2.

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Ishii, Mamoru, and Takashi Hibiki. "Two-fluid Model." In Thermo-Fluid Dynamics of Two-Phase Flow. Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-7985-8_9.

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Ishii, Mamoru, and Takashi Hibiki. "Two-Fluid Model." In Thermo-Fluid Dynamics of Two-Phase Flow. Springer US, 2006. http://dx.doi.org/10.1007/978-0-387-29187-1_9.

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Luppes, Roel, Arthur Veldman, and Rik Wemmenhove. "Simulation of Two-Phase Flow in Sloshing Tanks." In Computational Fluid Dynamics 2010. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17884-9_70.

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Dorogan, Kateryna, Jean-Marc Hérard, and Jean-Pierre Minier. "A Hybrid Method for Two-Phase Flow Simulations." In Computational Fluid Dynamics 2010. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17884-9_9.

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Ishii, Mamoru, and Takashi Hibiki. "One-Dimensional Two-Fluid Model." In Thermo-Fluid Dynamics of Two-Phase Flow. Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-7985-8_15.

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Ishii, Mamoru, and Takashi Hibiki. "One-Dimensional Two-Fluid Model." In Thermo-Fluid Dynamics of Two-Phase Flow. Springer US, 2006. http://dx.doi.org/10.1007/978-0-387-29187-1_15.

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Yao, J., Y. Yao, P. J. Mason, T. Zhang, F. J. G. Heyes, and P. E. Roach. "CFD Simulation of Gas-Water Two-Phase Flow in Turbocharger." In Computational Fluid Dynamics 2008. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01273-0_108.

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Ishii, Mamoru, and Takashi Hibiki. "Hydrodynamic Constitutive Relations for Interfacial Transfer." In Thermo-Fluid Dynamics of Two-Phase Flow. Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-7985-8_12.

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Ishii, Mamoru, and Takashi Hibiki. "Local Instant Formulation." In Thermo-Fluid Dynamics of Two-Phase Flow. Springer US, 2006. http://dx.doi.org/10.1007/978-0-387-29187-1_2.

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Conference papers on the topic "Laminar flow. Fluid dynamics. Two-phase flow"

1

Hosseinverdi, Shirzad, and Masoud Boroomand. "Prediction of Laminar-Turbulent Transitional Flow over Single and Two-Element Airfoils." In 40th Fluid Dynamics Conference and Exhibit. American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-4290.

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Kleinstreuer, C., P. W. Longest, and Z. Zhang. "Theory of Two-Phase Biofluid Flow Dynamics and Selected Applications." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56560.

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Examples of two-phase flows in the human body include particle-hemodynamics in branching arteries and toxic/therapeutic air-particle mixtures in the respiratory system. In this review, the fundamentals of modeling dilute particle suspensions are presented with computer applications to the geometric design of bypass graft-ends and the prediction of local aerosol depositions in the human upper airways. For the latter project, aerosols in the nano- and micro-size ranges, solid and liquid particles as well as evaporating droplets are considered. Specifically, the particle-hemodynamics project deals with the prediction of aggravating two-phase flow events leading to arterial diseases, such as atherosclerosis and hyperplasia, and subsequently the design of bypass grafts mitigating post-operative complications. The lung-aerosol project requires accurate and realistic computations of laminar-to-turbulent airflows and toxic (or therapeutic) particle depositions in the human airways for two applications: dosimetry-and-health-effect assessments of toxic particles and optimal drug aerosol delivery by inhalation. Two-phase flow results from different case studies are presented.

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Sanchez, Mauricio, Andrew W. Henderson, Dimitrios V. Papavassiliou, and Evan C. Lemley. "Entropy Generation in Laminar Flow Junctions." In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72334.

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Laminar flow dominates microscale and milliscale applications. This work is focused on laminar energy losses in junctions (bifurcations). Reynolds number plays a dominant role in energy losses for laminar flow. The physical cause of these energy losses is entropy generation. This paper analyzes the energy losses in junctions by considering the entropy generation. This paper documents results from computational fluid dynamics (CFD) simulations of laminar flow in planar junctions. The junctions studied consisted of circular pipes with two outlets and one inlet tube with Reynolds numbers ranging from one to 1000. A general technique has been developed to produce computer models of junctions in which the inlet tube size is set, but the outlets are allowed to vary in size and angle relative to the inlet tube. A generalized algorithm has been implemented to create three-dimensional models of the junctions for both computational and experimental studies. The entropy generation has been determined in junctions from simulation results for the velocity field. Results for entropy generation as a function of geometry and Reynolds are presented. Energy loss coefficients are derived from the simulations and compared to experimental measurements of energy losses in microscale junctions.

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Olayiwola, Bolaji O., Gerhard Schaldach, and Peter Walzel. "Applied Pulsed Flow for Single-Phase Convective Heat Transfer Enhancement in a Laminar Flow Cooling System." In ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/ht2008-56091.

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Experimental and CFD studies were performed to investigate the enhancement of convective heat transfer in a laminar cooling system using flow pulsation in a flat channel with series of regular spaced fins. Glycerol-water mixtures with dynamic viscosities in the range of 0.001 kg/ms–0.01 kg/ms were used. A steady flow Reynolds number in the laminar range of 10 &lt; Re &lt; 1200 was studied. The amplitudes of the applied pulsations are in the range of 0.25 &lt; A &lt; 0.55 mm and the frequency range is 10 &lt; f &lt; 60 Hz. Two different cooling devices with active length L = 450 mm and 900 mm were investigated. CFD simulations were performed on a parallel-computer (Linux-cluster) using the software suit CFX11 from ANSYS GmbH, Germany. The rate of cooling was found to be significant at moderate low net flow rates. In general, no significant heat transfer enhancement at very low and high flow rates was obtained in compliance with the experimental data. The heat transfer coefficient was found to increase with increasing Prandtl number Pr at constant oscillation Reynolds number Reosc whereas the ratio of the hydraulic diameter to the length of the channel dh/L has insignificant effect on the heat transfer coefficient. This is due to enhanced fluid mixing. CFD results allow for performance predictions of different geometries and flow conditions.

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Yang, Jui-Ming, and Philip R. LeDuc. "Three-Dimensional Laminar Flow for Localized Cellular Stimulation." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61643.

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Stimulation of living mammalian cells is primarily accomplished by the delivery of chemical agents to single cells or cell populations. Due to the fast response time of diffusion for these agents over the small size scale of individual cells, localized stimulation is limited. Currently, there are alternate techniques that can produce localized gradients of chemical stimulants over single cells, but they lack the ability for long time scale events that are requisite for many cellular processes because of this diffusion limitation. We have developed a device that is able to create chemical agent separation in three dimensions along distinct boundaries that can be applied to cells. As many techniques are two-dimensionally constrained, this provides us with a more physiologically relevant system for investigating cellular signal transduction and can allow basal to apical activation separations. To accomplish this, multiple flow paths were introduced to manipulate spatiotemporally distinct regions inside a single capillary channel. Solutions that flow laminarly inside these fluidic channels deliver predefined chemicals to specific locations without turbulent mixing. Separation using this system under laminar flows created not only side by side domains in this capillary but also vertical as well. This device has multiple potential applications both in cell and molecular biology as well as in fluid dynamics and fabrication processes.

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Bhopte, Siddharth, Bahgat Sammakia, and Bruce Murray. "Mixing Enhancement in Two-Component Microchannel Flow: Geometric and Pulsed Flow Effects." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43387.

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The ability to control mixing of reagents in MEMS systems is crucial for many biological and chemical analysis applications. However mixing in these microfluidic devices is a challenge because the flows are laminar corresponding to very low Reynolds number. Recent numerical and experimental research studies have investigated the effect of microchannel geometries and time pulsing on mixing enhancement. In this paper, mixing of two aqueous reagents is studied in a “T” shaped microchannel by means of computational fluid dynamics (CFD). The baseline microchannel geometry has three branches: two inlets and one outlet. All the branches are 200 μm wide and 120 μm deep, which is a typical scale for mass produced disposable devices. A simple geometric modification to the baseline case is made by splitting one of the inlets in half such that the net flow rate at the outlet remains same as the baseline case. The two split inlets impinge the microchannel lateral flow from opposite directions. Significant improvement in mixing using the two-way split flow modification is predicted from the modeling. Previous studies have also shown that by adding well -shaped cavities or grooves in microchannels enhance mixing, so well-shaped cavities are added at the two split inlets. Considerable improvement over the two-way split flow model is seen by adding well-shaped cavities at the split inlets. Three geometries have been systematically studied for both constant and time dependent flows.

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Yeow, Ye Jien, Mohan Yu, James B. Day, and Roozbeh (Ross) Salary. "A Computational Fluid Dynamics (CFD) Study of Material Flow in Pneumatic Microextrusion (PME) Additive Manufacturing Process." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24325.

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Abstract The objective of this study is to investigate the underlying physical phenomena behind material transport in pneumatic micro-extrusion (PME) process, using a computational fluid dynamics (CFD) model. The geometry of the PME deposition head assembly (including a micro-capillary having a diameter of 200 μm) was set up in the ANSYS-Fluent environment, based on a patented design in addition to direct measurements of the dimensions of the assembly. Subsequently, the geometry was meshed using tetrahedron cells. Besides, five layers of inflation were defined with the aim to obtain an accurate solution near all wall boundaries. The transient, pressure-based Navier-Stokes algorithm (based on absolute velocity formulation) was the mathematical model of choice, used to obtain transient solutions. To account for the effects of compressibility as well as viscose heating, the energy equation (in addition to the continuity and momentum equations) was utilized in the CFD model. Furthermore, the explicit volume of fluid model (composed of two Eulerian phases) and the laminar viscose model were used to collectively establish a viscose two-phase flow model for the molten polymer (PCL) deposition in the PME process. Pressure-velocity coupling was implemented using the semi-implicit method for pressure linked equations (SIMPLE). Finally, experimental sensor data was used with the aim to: (i) define the boundary conditions (as follows), and (ii) validate the CFD model. In this study, PCL powder was loaded into the cartridge, maintained at 120 °C, defined as the temperature of all stationery walls (with no slip condition). Pressure inlet was the type of boundary defined for the high-pressure gas flow in the PME process, set at 550 kPa. The laminar molten PCL flow was deposited on a glass substrate, steadily and uniformly kept at 45 °C, defined as the temperature of the substrate wall, moving with a speed of 0.35 mm/s. Overall, the results of this study pave the way for better understanding of the causal phenomena behind material transport and deposition in the PME process toward fabrication of bone tissue scaffolds with optimal functional properties.

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Hatman, Anca, and Ting Wang. "Separated-Flow Transition: Part 3 — Primary Modes and Vortex Dynamics." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-463.

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This paper clearly identifies the possible modes of transition in the separated boundary layers and their specific characteristics. This study distinguishes between the short and long bubbles primarily based on the separated flow structure. A hypothetical description of the vortex structure and evolution for each separated-flow transition mode is provided. The present approach in analyzing separated-flow transition is based on the assumption that the transition to turbulence in separated boundary layers is a result of the superposition of the effects of two different types of instability. The first type of instability is the Kelvin-Helmholtz (KH) instability. It occurs and develops in the shear layer at a specific location downstream of the separation point. The concentration of spanwise vorticity grows in time and remains in place through the vortex sheet roll-up mechanism. The roll-up vortex interacts with the wall and induces periodic ejection of near-wall fluid into the separated shear layer. The ejection process takes place at a location identifiable by the maximum displacement of shear layer, xMD. The second type of instability is the (convective) Tollmien-Schlichting (TS) instability. It originates in the boundary layer prior to the separation point and continues to evolve in the separated shear layer. The mechanism for the TS instability also leads to roll-ups, but it involves viscous tuning of the instability waves. Thus, the separated-flow transition is the result of spatially developing, often competing instabilities. The ejection induces the onset of transition for laminar short and long bubble modes of transition and controls the mid-transition point of transitional separation mode. The ejection may be accompanied by vortex shedding. Shedding occurs in the laminar separation - short bubble mode and occasionally in the transitional separation mode; however, it is not present in the laminar separation - long bubble mode of transition.

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Mohekar, Ajit A., Burt S. Tilley, and Vadim V. Yakovlev. "Onset of Bénard Convection in an Electromagnetic Heat Exchanger Under Laminar Flow Conditions." In ASME 2021 Heat Transfer Summer Conference collocated with the ASME 2021 15th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/ht2021-60452.

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Abstract Electromagnetic (EM) heat exchangers (HX) are critical components in power beaming applications where EM waves are radiated towards an EM HX, which then converts incident energy into heat or mechanical work. An EM HX consists of a lossy ceramic undergoing EM heating, and a fluid flow maintaining thermal contact transfers heat from the ceramic. Temperatures during high-power EM processing of ceramics materials such as zirconia suggest that liquids would be in gaseous phase, so models of EM HX with compressible gas dynamics may provide insights into experimental scenario. As a first step, we consider an EM HX such that plane Poiseuille flow of an incompressible coolant whose density drops linearly with temperature is situated above a lossy ceramic material. Compressible effects are negligible, but density gradients within the fluid can give rise to buoyancy-driven flow under the action of gravity, which may affect the performance of the device. We determine the power of incident waves at which Bénard convection is initiated, through a linear stability analysis, in the fluid layer. We show that in case of temperature dependent ceramic loss factor, perturbations in temperature give rise to an electric (fringe) field which then feeds back into the system promoting the Bénard instability.

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van Rij, Jennifer, Todd Harman, and Tim Ameel. "The Effect of Creep Flow on Two-Dimensional Isoflux Microchannels." In ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2006. http://dx.doi.org/10.1115/icnmm2006-96150.

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Micro channel convective heat transfer and friction loss characteristics are numerically evaluated for gaseous, two-dimensional, steady state, laminar, constant wall heat flux flows. The effects of Knudsen number, accommodation coefficients, second order slip boundary conditions, creep flow, and thermal/hydrodynamic developing flow are considered. These effects are compared through the Poisuelle number and Nusselt number. Numerical values for the Poisuelle and Nusselt numbers are obtained using a continuum based three-dimensional, unsteady, compressible computational fluid dynamics algorithm that has been modified with slip boundary conditions. To verify the numerical results, analytic solutions for the hydrodynamically and thermally fully developed Poisuelle and Nusselt numbers have been derived. The fully developed analytic Poisuelle and Nusselt numbers are given as a function of Knudsen number, the first and second order velocity slip and temperature jump coefficients, the Brinkman number, and the ratio of the thermal creep velocity to the mean velocity. Excellent agreement between the numerical and analytical data is demonstrated. Second order slip terms and creep velocity are shown to have significant effects on the Poisuelle and Nusselt numbers.

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Reports on the topic "Laminar flow. Fluid dynamics. Two-phase flow"

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Tentner, A. Computational fluid dynamics modeling of two-phase flow in a BWR fuel assembly. Final CRADA Report. Office of Scientific and Technical Information (OSTI), 2009. http://dx.doi.org/10.2172/967950.

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