Relevant bibliographies by topics / Flow regime

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Academic literature on the topic 'Flow regime'

Author: Grafiati
Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Flow regime"

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Dobson, M. K., and J. C. Chato. "Condensation in Smooth Horizontal Tubes." Journal of Heat Transfer 120, no. 1 (February 1, 1998): 193–213. http://dx.doi.org/10.1115/1.2830043.

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An experimental study of heat transfer and flow regimes during condensation of refrigerants in horizontal tubes was conducted. Measurements were made in smooth, round tubes with diameters ranging from 3.14 mm to 7.04 mm. The refrigerants tested were R-12, R-22, R-134a, and near-azeotropic blends of R-32/R-125 in 50 percent/50 percent and 60 percent/40 percent compositions. The study focused primarily on measurement and prediction of condensing heat transfer coefficients and the relationship between heat transfer coefficients and two-phase flow regimes. Flow regimes were observed visually at the inlet and outlet of the test condenser as the heat transfer data were collected. Stratified, wavy, wavy annular, annular, annular mist, and slug flows were observed. True mist flow without a stable wall film was not observed during condensation tests. The experimental results were compared with existing flow regime maps and some corrections are suggested. The heat transfer behavior was controlled by the prevailing flow regime. For the purpose of analyzing condensing heat transfer behavior, the various flow regimes were divided into two broad categories of gravity-dominated and shear-dominated flows. In the gravity dominated flow regime, the dominant heat transfer mode was laminar film condensation in the top of the tube. This regime was characterized by heat transfer coefficients that depended on the wall-to-refrigerant temperature difference but were nearly independent of mass flux. In the shear-dominated flow regime, forced-convective condensation was the dominant heat transfer mechanism. This regime was characterized by heat transfer coefficients that were independent of temperature difference but very dependent on mass flux and quality. Heat transfer correlations that were developed for each of these flow regimes successfully predicted data from the present study and from several other sources.
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Singh, Sanjeev, and Rajeev Kukreja. "An Experimental Investigation of Flow Patterns During Condensation of HFC Refrigerants in Horizontal Micro-Fin Tubes." International Journal of Air-Conditioning and Refrigeration 27, no. 01 (March 2019): 1950010. http://dx.doi.org/10.1142/s201013251950010x.

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Condensation heat transfer coefficients and flow regimes in two different horizontal micro-fin tubes are examined during the condensation of refrigerants R-134a and R-410A. The present investigation has focused on determination and prediction of condensation heat transfer coefficients and finding the interrelation between heat transfer coefficients and the prevailing flow regimes. During flow visualization, flow regimes have been captured using borosilicate glass tube at inlet and outlet of the test condenser using high speed digital camera. Stratified, stratified wavy, wavy annular, annular, slug and plug flows have been observed at different mass fluxes and vapor qualities of the refrigerants. The observed flow regimes are compared with the existing flow regime maps proposed by Breber et al. [Prediction of horizontal tube side condensation of pure components using flow regime criteria, J. Heat Transfer 102 (1980) 471–476], Tandon et al. [A new flow regime map for condensation inside horizontal tubes, J. Heat Transfer 104 (1982) 763–768.] and Thome et al. [Condensation in horizontal tubes, part 2: New heat transfer model based on flow regimes, Int. J. Heat Mass Transfer 46 (2003) 3365–3387.] Thome et al. [Condensation in horizontal tubes, part 2: New heat transfer model based on flow regimes, Int. J. Heat Mass Transfer 46 (2003) 3365–3387.] flow regime map shows good agreement with experimental data.
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Phung, Viet-Anh, and Pavel Kudinov. "Prediction of Flow Regimes and Thermal Hydraulic Parameters in Two-Phase Natural Circulation by RELAP5 and TRACE Codes." Science and Technology of Nuclear Installations 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/296317.

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In earlier study we have demonstrated that RELAP5 can predict flow instability parameters (flow rate, oscillation period, temperature, and pressure) in single channel tests in CIRCUS-IV facility. The main goals of this work are to (i) validate RELAP5 and TRACE capabilities in prediction of two-phase flow instability and flow regimes and (ii) assess the effect of improvement in flow regime identification on code predictions. Most of the results of RELAP5 and TRACE calculation are in reasonable agreement with experimental data from CIRCUS-IV. However, both codes misidentified instantaneous flow regimes which were observed in the test with high speed camera. One of the reasons for the incorrect identification of the flow regimes is the small tube flow regime transition model in RELAP5 and the combined bubbly-slug flow regime in TRACE. We found that calculation results are sensitive to flow regime boundaries of RELAP5 which were modified in order to match the experimental data on flow regimes. Although the flow regime became closer to the experimental one, other predicted thermal hydraulic parameters showed larger discrepancy with the experimental data than with the base case calculations where flow regimes were misidentified.
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Growns, Ivor, and Ivars Reinfelds. "Environmental flow management using transparency and translucency rules." Marine and Freshwater Research 65, no. 8 (2014): 667. http://dx.doi.org/10.1071/mf13192.

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River flow regimes and their variability are considered by many authors to be the most important factor structuring their physical and ecological environment. In regulated rivers, environmental or instream flows are the main management technique used to ameliorate the ecological effects of flow alteration. We highlight two concepts that are not commonly used in a managed flow regime but help return natural flow variability to a managed river, namely, transparent and translucent flow rules. Transparency flows target lower flows up to a defined threshold so that all inflows are released from a dam or are protected from abstraction. Translucency flows form a percentage of inflows greater than the transparency threshold that are released to maintain a proportion of flow pulses in the river system. The main ecological concept underlying transparency and translucency flows is that riverine biota are adapted to the historical flow regime. Although the loss of small to moderate flood events may arise from implementation of translucency and/or transparency flow regimes, we advocate that these rule types would, nonetheless, be beneficial in many managed flow regimes and present two case studies where they have been defined and implemented.
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Kunii, Kohei, Takahiro Ishida, Yohann Duguet, and Takahiro Tsukahara. "Laminar–turbulent coexistence in annular Couette flow." Journal of Fluid Mechanics 879 (October 1, 2019): 579–603. http://dx.doi.org/10.1017/jfm.2019.666.

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Annular Couette flow is the flow between two coaxial cylinders driven by the axial translation of the inner cylinder. It is investigated using direct numerical simulation in long domains, with an emphasis on the laminar–turbulent coexistence regime found for marginally low values of the Reynolds number. Three distinct flow regimes are demonstrated as the radius ratio $\unicode[STIX]{x1D702}$ is decreased from 0.8 to 0.5 and finally to 0.1. The high-$\unicode[STIX]{x1D702}$ regime features helically shaped turbulent patches coexisting with laminar flow, as in planar shear flows. The moderate-$\unicode[STIX]{x1D702}$ regime does not feature any marked laminar–turbulent coexistence. In an effort to discard confinement effects, proper patterning is, however, recovered by artificially extending the azimuthal span beyond $2\unicode[STIX]{x03C0}$. Eventually, the low-$\unicode[STIX]{x1D702}$ regime features localised turbulent structures different from the puffs commonly encountered in transitional pipe flow. In this new coexistence regime, turbulent fluctuations are surprisingly short-ranged. Implications are discussed in terms of phase transition and critical scaling.
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Wilson, Donna, David M. Hannah, and Glenn R. McGregor. "A large-scale hydroclimatological perspective on western European river flow regimes." Hydrology Research 44, no. 5 (November 9, 2012): 809–33. http://dx.doi.org/10.2166/nh.2012.201.

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A novel flow regime classification scheme was applied to 141 river basins across western Europe, providing more robust analysis of space–time variability in regimes and their driving hydroclimatological processes. Regime shape (timing) and magnitude (size) were classified to regionalise long-term average flow regimes and to quantify year-to-year variation in regimes for each basin. Six long-term regime shape regions identified differences in seasonality related to latitude and altitude. Five long-term magnitude regions were linked to location plus average annual rainfall. Spatial distribution of long-term regimes reflected dominant climate and runoff generation processes. Regions were used to structure analysis of (relative) inter-annual regime dynamics. Six shape and five magnitude inter-annual regimes were identified; and regime stability (switching) assessed at pan-European, regional and basin scales. In some years, certain regime types were more prevalent, but never totally dominant. Regime shape was more stable at higher altitude due to buffering by frozen water storage-release (cf. more variable rainfall-runoff at lower altitudes). The lower inter-annual magnitude regimes persisted across larger domains (cf. higher magnitude) due to the more widespread climatic conditions generating low flow. Notably, there was limited spatio-temporal correspondence between regime shape and magnitude, suggesting variations in one attribute cannot be used to infer the other.
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Liebenberg, Leon, John R. Thome, and Josua P. Meyer. "Flow Visualization and Flow Pattern Identification With Power Spectral Density Distributions of Pressure Traces During Refrigerant Condensation in Smooth and Microfin Tubes." Journal of Heat Transfer 127, no. 3 (March 1, 2005): 209–20. http://dx.doi.org/10.1115/1.1857942.

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This paper presents a flow pattern identifier of the prevailing flow regime during refrigerant condensation inside smooth- and microfin tubes. The power spectral density distribution of the fluctuating condensing pressure signal was used to identify the prevailing flow regime, as opposed to the traditional (and subjective) use of visual-only methods, and/or smooth-tube flow regime maps. The prevailing flow regime was observed by using digital cameras and was validated with the use of the conventional smooth-tube flow regime transition criteria, as well as a new flow regime map for microfin-tube condensation. Experimental work was conducted for condensing refrigerants R-22, R-407C, and R-134a at an average saturation temperature of 40°C with mass fluxes ranging from 300–800 kg/m2 s, and with vapor qualities ranging from 0.05–0.15 at condenser outlet to 0.85–0.95 at condenser inlet. Tests were conducted with one smooth-tube condenser and three microfin-tube condensers (with helix angles of 10°, 18°, and 37° respectively). The power spectral density distributions of the condensing pressure signals distinguish the annular and intermittent (slug and plug) flows. A very low resonant frequency (<40 Hz) and low power spectral density amplitude of the pressure oscillation denoted stratified and wavy flows. As the annular flow regime was approached, the oscillations became larger and their frequencies increased (typically 40–120 Hz). Intermittent flow showed the most distinct character of all flow regimes. Its trace consisted of large amplitude pressure pulses occurring at fairly constant frequencies (approximately 50, 60, 80, 100, and 120 Hz). As the transition from intermittent to annular flow began, the pressure fluctuations became less regular and the amplitude dropped sharply.
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Abbasian Arani, Ali Akbar, and Majid Dehghani. "Numerical Comparison of Two and Three Dimensional Flow Regimes in Porous Media." Defect and Diffusion Forum 312-315 (April 2011): 427–32. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.427.

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The purpose of this work is to study the fluid flow regimes in a porous media with high enough velocities (in the range of laminar flow). In our study, the results obtained from expanding Darcy’s equation to Forchheimer’s equation with volume averaging method have been used for studdying the fluid flow behavior in 2D and 3D models. Results of numerical simulations show that in all cases, there are weak inertial regime, strong inertial regime and transition zone. In all the cases, the domain of weak inertial regime is relatively narrow, and this problem is intensified in the 3D numerical simulations. This could be the reason of missing the weak inertial regime in experimental studies on inertial fluid flow in porous media. The domain of strong inertial regime in 3D models is so wide that after Darcy’s regime, the governed regime is the strong inertial regime. To obtain more accurate and analytical results, more studies should be done on the 2D and the 3D flow regimes.
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van der Spek, Alex, and Alix Thomas. "Neural-Net Identification of Flow Regime With Band Spectra of Flow-Generated Sound." SPE Reservoir Evaluation & Engineering 2, no. 06 (December 1, 1999): 489–98. http://dx.doi.org/10.2118/59067-pa.

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Summary Multiphase production log interpretation requires that the flow regime along hole in the wellbore is known. Flow regime is the cased-hole analog of lithology. Knowledge of the flow regime will help to interpret tool signals, will help to evaluate the flow rate on a per phase basis, and will reduce post-processing load. The flow regime can be classified correctly by a neural net in up to 87% of all cases using 1/3 octave band spectra of flow-generated sound plus the pipe inclination angle. Without the inclination an 88% correct classification can be achieved. A neural net trained on commercially available tool data (noise cuts) appears to be too sensitive to the wellbore inclination. Hence, application of automated neural net interpretation of noise logs requires a new generation of noise logging tools. Introduction Flow regime is for the fluid dynamicist what lithology is for the petrophysicist. Without a lithology classification, it is difficult if not impossible to quantify hydrocarbon volumes in a reservoir. Likewise, without a flow regime classification, it is hard to quantify fluid flow rates in two-phase flow in a conduit. The conventional way to classify the flow regime is by visual observation of flow in a conduit by a human observer. Although downhole video surveys are commercially available, visual observation of downhole flow is not standard practice in (horizontal well) production logging, since it requires a special wireline (optical fiber cable). Moreover, downhole video surveys can only be successful in transparent fluids, either gas wells or wells killed with clear kill fluid. In oil wells, an alternative to visual observation for classifying the flow regime is needed. All flow regimes produce their own characteristic sounds. A trained human observer can classify the flow regime in a pipe by auditory rather than visual observations. Contrary to video surveys, sound logging services are readily available at low cost from various cased-hole wireline service providers. The traditional use of such sound logs is to pinpoint leaks in either casing or tubing strings. In addition to the sound logs recorded, the surface control panel is equipped with amplifiers and speakers that allow audible monitoring of downhole produced sounds. The sound log typically is a plot versus along hole depth of the (uncalibrated) sound pressure level in five different frequency bands with high pass cut-off frequencies equal to 200, 600, 1000, 2000 and 4000 Hz (noise cuts). In principle, the logging engineer, based on auditory observation of the downhole sounds, could carry out flow regime classification. This procedure, however, is impractical; it is prone to errors, it cannot be reproduced from recorded logs (the sound is not normally recorded on audio tape) and it relies on the experience of the specific engineer. The objective of this investigation was to establish the feasibility of classifying the flow regime by a neural net. A second objective was to identify the minimum required resolution of sound band spectra in order to allow a neural net to classify flow regime correctly in excess of, say, 85% of all cases. The figure 85% was chosen because, from the authors' experience human beings, using visual observations cannot classify the flow regime correctly in 10 to 20% of all cases. To meet these two objectives, an extensive experimental program was carried out whereby two-phase flow-generated sound was recorded as 1/3 octave spectra. Subsequently, a neural net was trained on various kinds of band spectra that could be derived from the recorded 1/3 octave spectra. Both objectives were met and it appears that a neural net can classify the flow regime correctly in up to 88% of all cases using 1/3 octave spectra of two-phase flow-generated sound. Successful application of neural net classification of the flow regime from sound logs in the field brings several benefits to the business. First of all it will allow the application of the correct, flow regime specific, hydraulic model to the task of evaluating horizontal well, two-phase flow production logs. Second, it will allow a more constrained consistency check on recorded production logging data. Last but not least, it alleviates the need to predict the flow regime using hydraulic stability criteria from first principles thereby reducing computational loads (from the authors' experience at least a factor of 10) and resulting in faster turn around times. Theory: Flow Regimes Two-phase flow is the interacting flow of two phases, liquid, solid or gas, where the interface between the phases is influenced by their motion.1 Many different flow patterns can result from the changing form of the interface between the two phases. These patterns depend on a variety of factors, for instance, the phase flow rates, the pressure and the diameter and inclination of the pipe containing the flow in question, etc. Flow regimes in vertical upward flow are illustrated in Fig. 1 and are described below.1Bubble flow: A dispersion of bubbles in a continuum of liquid.Intermittent or slug flow: The bubble diameter approaches that of the tube. The bubbles are bullet shaped. Small bubbles are suspended in the intermediate liquid cylinders.Churn or froth flow: A highly unstable flow of an oscillatory nature, whereby the liquid near the pipe wall continuously pulses up and down.Annular flow: A film of liquid flows on the wall of the pipe and the gas phase flows in the center.
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Lachmy, Orli, and Nili Harnik. "Wave and Jet Maintenance in Different Flow Regimes." Journal of the Atmospheric Sciences 73, no. 6 (June 1, 2016): 2465–84. http://dx.doi.org/10.1175/jas-d-15-0321.1.

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Abstract The wave spectrum and zonal-mean-flow maintenance in different flow regimes of the jet stream are studied using a two-layer modified quasigeostrophic (QG) model. As the wave energy is increased by varying the model parameters, the flow transitions from a subtropical jet regime to a merged jet regime and then to an eddy-driven jet regime. The subtropical jet is maintained at the Hadley cell edge by zonal-mean advection of momentum, while eddy heat flux and eddy momentum flux convergence (EMFC) are weak and concentrated far poleward. The merged jet is narrow and persistent and is maintained by EMFC from a narrow wave spectrum, dominated by zonal wavenumber 5. The eddy-driven jet is wide and fluctuating and is maintained by EMFC from a wide wave spectrum. The wave–mean flow feedback mechanisms that maintain each regime are explained qualitatively. The regime transitions are related to transitions in the wave spectrum. An analysis of the wave energy spectrum budget and a comparison with a quasi-linear version of the model show that the balance maintaining the spectrum in the merged and subtropical jet regimes is mainly a quasi-linear balance, whereas in the eddy-driven jet regime nonlinear inverse energy cascade takes place. The amplitude and wavenumber of the dominant wave mode in the merged and subtropical jet regimes are determined by the constraint that this mode would produce the wave fluxes necessary for maintaining a mean flow that is close to neutrality. In contrast, the equilibrated mean flow in the eddy-driven jet regime is weakly unstable.
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Dissertations / Theses on the topic "Flow regime"

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Lovick, Jonathon. "Horizontal, oil-water flows in the dual continuous flow regime." Thesis, University College London (University of London), 2004. http://discovery.ucl.ac.uk/1383486/.

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The research presented in this thesis is concerned with the flow behaviour of two-phase, liquid-liquid, oil-water flow through horizontal pipes. The test liquids used were oil (density 828kg/rn3, viscosity 6x iO 3 Pa s) and water, with experiments carried out in a purpose built test facility with a stainless steel pipe (internal dia. 38mm, length 8m). Visual observation of the flow was possible at low mixture velocities through a lm transparent pipe at the end of the test section. At higher mixture velocities local probes were used for flow pattern identification. These local probes were a conductivity probe for identifying the continuous phase, and a high frequency impedance probe for measuring local phase distribution. A dual sensor impedance probe was also developed for measuring local drop velocity and also the drop chord length distributions. Pressure gradient was also measured using a differential pressure transducer, and in-situ phase fractions were obtained using Quick Closing Valves. Experimental results show that the dual continuous flow regime, where both phases retain their continuity while there is mixing at the interface, dominates at all input oil fractions at low mixture velocities and intermediate oil fractions at high mixture velocities. In general the pressure drop of the two-phase mixture is lower than that of single phase oil. At higher mixture velocities a minimum in pressure gradient appeared at high oil fractions perhaps as a combination of the drag reduction phenomenon and the relative fraction of the oil and water layers in the pipe. At the highest mixture velocity this minimum was at the boundary of fully dispersed oil continuous flow with dual continuous flow. Velocity ratios are shown to increase with increasing oil fraction at low mixture velocities, with this trend reversing at high mixture velocities. These trends in the pressure gradient and velocity ratio can be explained using the phase distribution diagrams, with the interfacial curvature greatly affecting velocity ratio. Local chord length data shows that, in general, drop sizes decrease with increasing distance from the interface and that oil drops tend to be slightly larger than water drops. Mixture velocity did not significantly affect the drop size of either phase in dual continuous flow. A modified version of the two-fluid model was suggested for dual continuous flow that treats the upper and lower layers as dispersions and uses experimental entrainment to calculate their properties. Better predictions were obtained when friction factors that accounted for the drag reduction phenomenon were used to calculate wall shear stresses.
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Watson, Martin James. "Flow regime transitions and associated phenomena." Thesis, Imperial College London, 1999. http://hdl.handle.net/10044/1/8790.

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Rashid, Bilal. "Simplifying reservoir models by flow regime." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11104.

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This study focuses on the interaction between geological heterogeneity and the reservoir processes which govern fluid flow in porous media. We have developed and tested a measure of heterogeneity which uses the coefficient of variation of the vorticity of the flow field to quantify the impact of geological uncertainty on oil recovery. We go on to explore the vorticity formulation of the equations of motion in porous media as a basis for understanding reservoir dynamics, particularly in the presence of heterogeneity and density differences. We derive dimensionless numbers to quantify the relative importance of viscosity and density differences, molecular diffusion, dispersion, and permeability heterogeneity on reservoir flow behaviour. This approach is used to develop an objective measure of the impact of permeability heterogeneity on reservoir performance, which we have compared with traditional heterogeneity indices and shown how it may be used for realistic 2D and 3D geological models. We have used our heterogeneity index, and the dimensionless numbers to analyse the impact of heterogeneity, buoyancy effects, mobility ratio and dispersion on breakthrough time and recovery for first contact miscible gas injection processes using geologically realistic reservoir models. We find that the new heterogeneity number, in conjunction with these dimensionless numbers, provides meaningful results for real non-linear reservoir flows. We present phase diagrams which show how reservoir performance depends on mobility ratio, viscous-gravity ratio, and heterogeneity. We have proposed that the phase diagram, and a comparison of these dimensionless numbers can be used to identify the key factors which control recovery, thus assisting the engineer in determining appropriate enhanced oil recovery (EOR) techniques, without resort to detailed flow simulation. This will enable a quick, and more robust, evaluation of the impact of geological uncertainty in the field.
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Nema, Gaurav. "Flow regime transitions during condensation in microchannels." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22592.

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Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Garimella, Srinivas; Committee Member: Ghiaasiaan, Seyed Mostafa; Committee Member: Mistree, Farrokh.
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Kamram, Muhammad. "Analysis of Various Complex Flows of Micropolar Fluids in the Slip Flow Regime." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/70737.

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Four mathematical models have been developed to study the slip flow of micropolar fluids over a stretching/shrinking sheet under the influence of slip and the Newtonian heating conditions at the boundary. The optimal homotopy analysis method is applied for the solutions of these models. The results obtained from this study are useful in liquid crystals, polymeric suspensions, polishing artificial heart valves and internal cavities.
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SARE, ALEXANDRE REIS. "ANALYSIS OF FLOW REGIME IN CURUÁ-UNA DAM, PARÁ." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2003. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=3749@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
A análise das condições de fluxo na barragem de Curuá-Una (Pará) tem como objetivo avaliar a viabilidade geotécnica quanto à elevação do nível de operação do reservatório. A Usina de Curuá-Una (operada pela REDE Celpa) é responsável pelo abastecimento elétrico de Santarém. No entanto, nos horários de grande consumo, a produção de energia tem se mostrado insuficiente. O alteamento do reservatório de Curuá-Una é uma alternativa para o aumento de geração energética. Curuá-Una destaca-se por ser fundada em terreno arenoso, solução poucas vezes utilizada no mundo. A barragem de terra é do tipo zonada, com altura máxima de 26m e comprimento de 600m. Os parâmetros geotécnicos necessários para as análises do presente trabalho foram obtidos em ensaios de laboratório, em informações referentes à construção e em dados de instrumentação durante a operação da barragem. As análises numéricas foram realizadas com o programa FLOW3D. A retroanálise do regime de fluxo, feita com base na piezometria, possibilitou a estimativa das permeabilidades dos diversos materiais. A partir destes dados foi possível simular as poropressões associadas a diferentes níveis do reservatório. Foram definidos três níveis de alerta (normal, atenção e emergência) referentes à segurança da barragem. As análises indicam que a barragem opera atualmente dentro do nível normal e que um alteamento de 1,5m do reservatório não afeta a condição de segurança. O aumento das subpressões na base da barragem foi também avaliado, com os resultados mostrando um incremento máximo de 5 por cento.
The analysis of flow conditions in Curuá-Una Dam, State of Pará, has the objective of evaluating the geotechnical feasibility of raising the operation level of the reservoir. Curuá-Una Power Plant, operated by REDE Celpa, is responsible for the electric supply of Santarém city. However, in periods of peak consumption, the energy production has been insufficient. Raising of Curuá-Una reservoir is an attractive alternative for increasing energy production. Curuá-Una Dam is distinguished for being constructed on sandy alluvial soil, which is a solution rarely used in the world. The earth dam is zoned, with maximum height of 26m and crest length of 600m. The geotechnical parameters were obtained from laboratory tests, field instrumentation data and construction reports. The numerical analyses were carried out with FLOW3D program. A back-analysis of flow behavior was performed for evaluating permeability parameters, taking into account results from piezometers installed in the dam and in the foundation materials. These parameters were used to predict pore pressures associated to different reservoir levels. Three levels of alert conditions (normal, attention and emergency) referring to the safety of the dam have been defined. The analyses indicated that the dam is operating within normal levels and a 1.5m rising of the reservoir shall not affect dams safety. The uplift pressures, due to different reservoir levels, have also been evaluated, with results showing a maximum increment of 5 percent.
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Mohapatra, Chinmoy Krushna. "Computational Study of Internal Two Phase Flow in Effervescent Atomizer in Annular Flow Regime." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470741568.

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O'Donnell, Brynn Marie. "The Flow Regime of Function: Influence of flow changes on biogeochemical processes in streams." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/101660.

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Streams are ecosystems organized by disturbance. One of the most frequent disturbances within a stream is elevated flow. Elevated flow can both stimulate ecosystem processes and impede them. Consequently, flow plays a critical role in shifting the dominant stream function between biological transformation and physical transportation of materials. To garner further insight into the complex interactions of stream function and flow, I assessed the influence of elevated flow and flow disturbances on stream metabolism. To do so, I analyzed five years of dissolved oxygen data from an urban- and agriculturallyinfluenced stream to estimate metabolism. Stream metabolism is estimated from the production (gross primary production; GPP) and consumption (ecosystem respiration; ER) of dissolved oxygen. With these data, I evaluated how low and elevated flows differentially impact water quality (e.g., turbidity, conductivity) and metabolism using segmented metabolism- and concentration- discharge analyses. I found that GPP declined at varying rates across discharge, and ER decreased at lower flows but became constant at higher flows. Net ecosystem production (NEP; = GPP - ER) reflected the divergence of GPP and ER and was unchanging at lower flows, but declined at higher discharge. These C-Q patterns can consequently influence or be influenced by changes in metabolism. I coupled metabolism-Q and C-Q trends to examine linked flow-induced changes to physicochemical parameters and metabolism. Parameters related to metabolism (e.g., turbidity and GPP, pH and NEP) frequently followed coupled trends. To investigate metabolic recovery dynamics (i.e., resistance and resilience) following flow disturbances, I analyzed metabolic responses to 15 isolated flow events and identified the antecedent conditions or disturbance characteristics that most contributed to recovery dynamics. ER was both more resistant and resilient than GPP. GPP took longer to recover (1 to >9 days, mean = 2.5) than ER (1 to 2 days, mean = 1.1). ER resistance was strongly correlated with the intensity of the flow event, whereas GPP was not, suggesting that GPP responds similarly to flow disturbances, regardless of the magnitude of flow event. Flow may be the most frequent disturbance experienced by streams. However, streams are exposed to a multitude of other disturbances; here I also highlight how anthropogenic alterations to streams – namely, burying a stream underground – can change biogeochemical function. This thesis proposes novel frameworks to explore the nexus of flow, anthropogenic disturbances, and stream function, and thereby to further our understanding of the complex relationship between streams and disturbances.
Master of Science
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Alvarez, Martinez José Manuel. "Foam-flow behavior in porous media : effects of flow regime and porous-medium heterogeneity /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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Chen, Li-Kwen. "Unsteady flow and heat transfer in periodic complex geometries for the transitional flow regime." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Chen_09007dcc804bed71.pdf.

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Thesis (Ph. D.)--Missouri University of Science and Technology, 2008.
Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed May 12, 2008) Includes bibliographical references.
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Books on the topic "Flow regime"

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O'Gorman, William Thomas. Development of a directional flow probe for the hypersonic regime. [Toronto]: Dept. of Aerospace Science and Engineering, University of Toronto, 1997.

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O'Gorman, William Thomas. Development of a directional flow probe for the hypersonic regime. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1999.

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Environmental Consulting & Technology, Inc. Lower St. Johns River salinity regime assessment: Effects of upstream flow reduction near Deland. Palatka, Fla.]: St. Johns River Water Management District, 2008.

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Environmental Consulting & Technology, Inc. Lower St. Johns River salinity regime assessment: Effects of upstream flow reduction near Deland. Palatka, Fla.]: St. Johns River Water Management District, 2008.

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Mitchell, Thomas Robert. A framework for quantifying groundwater resources and developing an understanding of the aquifer flow regime. Birmingham: University of Birmingham, 1990.

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Cheel, R. J. Horizontal lamination and the sequence of bed phases and stratification under upper flow regime conditions. s.l: [Brock University], 1990.

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All fluid-flow-regimes simulation model for internal flows. New York: Nova Science Publishers, 2011.

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), St Johns River Water Management District (Fla. Lower St. Johns River salinity regime assessment: Effects of upstream flow reduction near DeLand ; prepared for St. Johns River Water Management District. Palatka, Fla: St. Johns River Water Management District, 2002.

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Constantinescu, Virgiliu Niculae. Dinamica fluidelor vîscoase în regim laminar. București: Editura Academiei Republicii Socialiste România, 1987.

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E, Beck A., Garven Grant, Stegena Lajos, International Union of Geodesy and Geophysics., American Geophysical Union, and International Union of Geodesy and Geophysics Symposium U.8 "Hydrogeological Regimes and Their Subsurface Thermal Effects" (1987 : Vancouver, B.C.), eds. Hydrogeological regimes and their subsurface thermal effects. Washington, DC: American Geophysical Union, 1989.

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Book chapters on the topic "Flow regime"

1

Kolev, Nikolay Ivanov. "Flow regime transition criteria." In Multiphase Flow Dynamics 2, 1–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20598-9_1.

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Mwelwa, Elenestina Mutekenya. "Suggested Environmental Flow Regime." In Establishing the Environmental Flow Regime for the Middle Zambezi River, 150–58. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780138756543-7.

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Sakura, Yasuo, Makoto Taniguchi, Cristoph Clauser, and Wang Ji-Yang. "Groundwater flow and subsurface thermal regime." In Groundwater Updates, 485–88. Tokyo: Springer Japan, 2000. http://dx.doi.org/10.1007/978-4-431-68442-8_92.

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Wrzesiński, Dariusz. "Flow Regime Patterns and Their Changes." In Springer Water, 163–80. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-61965-7_9.

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Anbarchian, A., and H. Torabian. "Slip Flow Regime Past over a Microsphere." In New Trends in Fluid Mechanics Research, 666–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-75995-9_223.

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Guglieri, G., M. Onorato, and F. Quagliotti. "Flow Visualization Study of Vortex Breakdown on a 65° Delta Wing in Dynamic Motion Regime." In Flow Visualization VI, 260–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84824-7_43.

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Kranenborg, E. Jurjen, and Henk A. Dijkstra. "Double Diffusive Flow Patterns in the Unicellar Flow Regime: Attractor Structure and Flow Development." In Geophysical Monograph Series, 89–96. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm094p0089.

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Smolar-Žvanut, Nataša, and Aleksandra Krivograd Klemenčič. "The Impact of Altered Flow Regime on Periphyton." In Ecohydraulics, 229–43. Chichester, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118526576.ch13.

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Lemke, Olaf, Wolfgang Neise, Lars Enghardt, Rudibert King, Rifet Muminovic, and Michael Möser. "Closed Loop Blade Tone Control in Axial Turbomachines by Flow Induced Secondary Sources in the Blade Tip Regime." In Active Flow Control II, 143–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11735-0_10.

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Melas, D., I. Ziomas, and C. Zerefos. "Numerical Simulation of the Flow Regime in Athens Area." In Air Pollution Modeling and Its Application X, 667–68. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-1817-4_96.

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Conference papers on the topic "Flow regime"

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Sepetauskas, Vinicius A., Bruno Massucatto, Adson A. de Paula, and Roberto G. da Silva. "Wavy Leading Edge Phenomena on Transonic Flow Regime." In 2018 Flow Control Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-4254.

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Matin, Meisam, Abdy Fazeli, and Saeed Moghaddam. "Physics of Transition to Annular Flow in Microchannel Flow Boiling Process." In ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icnmm2018-7753.

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Transition to annular flow regime in microchannels is arguably one of the most complex phenomena in the flow boiling process. The instability of the vapor-liquid interface in this interstitial regime presents an intricate situation in which the interface pattern rapidly changes with the mass flow rate and surface heat flux. Although a few past studies have reported observing this regime, thermohydraulics of the process and flow and boundary conditions under which this transition occurs have remained largely unknown. The main obstacle in deciphering the physics of this process is lack of measurement tools to characterize hydrodynamics and thermal characteristics of this flow regime at microscales. The present study benefits from implementation of a novel test device that enables measuring the liquid film thickness and its rapid variations with micrometer and microseconds spatial and temporal resolutions. It is determined that each flow regime has a unique surface temperature signature that enables its clear distinction without need for high-speed visualization. Based on the dynamics of the flow, we identified that the transitional region is comprised of two regimes coalescing bubbles (CB) and semi-annular flow conditions. The difference between these two flow regimes emanates from motion of liquid film beneath the bubble.
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Vedula, Keshav, Baki Cetegen, Joshua Madore, and Michelle Bellinger. "Biomimetic Tubercle Leading-Edge Airfoils in Transitional Reynolds Number Regime." In 2018 Flow Control Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-4250.

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Hamm, Trenton A., and Frederick R. Best. "Gravity dependent flow regime mapping." In AIP Conference Proceedings Volume 387. ASCE, 1997. http://dx.doi.org/10.1063/1.52057.

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Vedula, Keshav, Baki Cetegen, Joshua Madore, and Michelle Bellinger. "Correction: Biomimetic Tubercle Leading-Edge Airfoils in Transitional Reynolds Number Regime." In 2018 Flow Control Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-4250.c1.

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Bai, Bofeng, Xiaojie Zhang, Maolong Liu, and Wang Su. "Flow Regime Classification and Transition of Flow Boiling Through Porous Channel." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75589.

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In the present research, a visual experiment was carried out on the flow regimes of the porous channels in the spherical fuel element nuclear reactor. Boiling two-phase flow in different porous channels composed of particles with diameters of 4mm, 6mm and 8mm were studied respectively, and four different flow regimes occur within the experimental parameter range: bubbly flow, bubbly-slug flow, slug flow and slug-annular flow. The effects of heat flux, mass flux and particle diameter on the flow regimes were obtained. Bubbles and slugs deform, coalesce and break up more frequently, and increase in both number and size with the increase of the heat flux; bubbles and slugs tend to decrease in number and size with higher mass flux and particles of smaller diameters. At higher mass flux, a higher heat flux is needed to get the same flow regime that occurs at lower mass flux; with particles of smaller diameter, a higher heat flux is needed to get the same flow regime as that of particles of larger diameter. The flow regime map and flow regime transition have been proposed by modifying the void fractions of Tung/Dhir model.
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Chan, L., M. MacDonald, Nicholas Hutchins, D. Chung, and Andrew Ooi. "INVESTIGATION OF A TURBULENT FLOW FROM THE TRANSITIONALLY ROUGH REGIME TO THE FULLY ROUGH REGIME." In Ninth International Symposium on Turbulence and Shear Flow Phenomena. Connecticut: Begellhouse, 2015. http://dx.doi.org/10.1615/tsfp9.250.

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Chen, Q., and R. S. Amano. "A Study of Flows Over Microgrooves for Different Flow Pattern." In ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2006. http://dx.doi.org/10.1115/icnmm2006-96226.

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During condensation of R134a the flow patterns inside two three-dimensional (3-D) micro-fin tubes with different fin geometries were investigated. The flow patterns and their transitions were visibly observed and recorded. The experimental findings revealed the following results: a comparison of the condensation flow patterns in the 3-D micro-fin tubes with those in smooth tubes revealed no qualitative differences. The mist flow and the mist-annular flow that appeared in the smooth tube entrance region were not observed in 3-D micro-fin tubes. In the maps of the Mandhane flow regime and the Soliman flow regime, the area of annular flow region of the 3-D micro-fin tube extends towards lower Fr number range in the Soliman map and smaller vapor velocity range in the Mandhane map when compared with that of a smooth tube. The criterion of the flow regime transition between the annular flow and the wavy flow decreases from Fr = 7 to Fr = 2 in the Soliman flow regime map. However, no significant effect on the criterion for the plug flow transition was observed. The experimental data points of plug flow in the 3-D micro-fin tubes were also obtained in the same regime of smooth tube in Mandhane flow regime map. The Soliman flow regime map indicates the criterion for plug flow transition to be Fr = 0.4.
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Lee, Jae Young. "Fuzzy logical flow regime identification for two-phase flow." In The 2015 11th International Conference on Natural Computation. IEEE, 2015. http://dx.doi.org/10.1109/icnc.2015.7378080.

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Monrós-Andreu, G., R. Martínez-Cuenca, S. Torró, J. L. Muñoz-Cobo, and S. Chiva. "Influence of temperature and electrolyte concentration on regime maps in vertical-adiabatic two-phase pipe flow." In MULTIPHASE FLOW 2015. Southampton, UK: WIT Press, 2015. http://dx.doi.org/10.2495/mpf150121.

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Reports on the topic "Flow regime"

1

Zhang, Fuqing. Flow and Regime Dependent Mesoscale Predictability. Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada613569.

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Zhang, Fuqing. Flow and Regime Dependent Mesoscale Predictability. Fort Belvoir, VA: Defense Technical Information Center, September 2008. http://dx.doi.org/10.21236/ada533026.

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Zhang, Fuqing. Flow and Regime Dependent Mesoscale Predictability. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada541632.

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Knowlton, T. M., and J. G. Findlay. Determination of flow-regime boundaries for cohesive particles. Office of Scientific and Technical Information (OSTI), October 1991. http://dx.doi.org/10.2172/6025413.

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Knowlton, T. M., and J. G. Findlay. Determination of flow-regime boundaries for cohesive particles. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/5684479.

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Knowlton, T. Determination of flow-regime boundaries for cohesive particles. Office of Scientific and Technical Information (OSTI), October 1989. http://dx.doi.org/10.2172/5571439.

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Rucinski, R. LHe Flow Regime/Pressure Drop for D0 Solenoid at Steady State Conditions. Office of Scientific and Technical Information (OSTI), March 1993. http://dx.doi.org/10.2172/1031793.

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Banerjee, Subhodeep, Chris Guenther, and William A. Rogers. Validating the MFiX-DEM Model for Flow Regime Prediction in a 3D Spouted Bed. Office of Scientific and Technical Information (OSTI), February 2018. http://dx.doi.org/10.2172/1427022.

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Knowlton, T. M. Determination of flow-regime boundaries for cohesive particles. Quarterly report, June 20-September 19, 1989. Office of Scientific and Technical Information (OSTI), January 1990. http://dx.doi.org/10.2172/7026211.

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Sharar, Darin J., Nicholas R. Jankowski, and Avram Bar-Cohen. Flow Regime Transition in Inner Grooved Minichannel Cold Plates for Cooling Hybrid Electric Power Electronics. Fort Belvoir, VA: Defense Technical Information Center, January 2013. http://dx.doi.org/10.21236/ada573302.

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