CFD modelling of flow and heat transfer in the Taylor flow regime

Gupta, Raghvendra; Fletcher, David F.; Haynes, Brian S.

doi:10.1016/j.ces.2009.12.008

Cited by 127 publications

(78 citation statements)

References 54 publications

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“…In Fig. 64, the normalized bubble tip velocity is plotted as a function of were reported in [77,92]. In Fig.…”

Section: Reference Casementioning

confidence: 99%

“…The effects of mixture velocity, gas void fraction, liquid and gas inlet velocities and geometry of the tube or channel have been considered in the literature [75,77,85]. However, a fundamental understanding of the heat transfer mechanisms in boiling slug flow is still lacking.…”

Section: Literature Reviewmentioning

confidence: 99%

“…A heat transfer model as a function of parameters such as slug length, flow rate of gas and liquid was proposed based on negligible gas heat capacity and conductivity and one-dimensional unsteady heat conduction in liquid film. Gupta et al [77] utilized two commercial codes to compare the VOF method (using Fluent) and the level set method (TransAT) in the study of gas-liquid flows and heat transfer in microchannels with constant wall heat flux and constant wall temperature boundary conditions. They reported around 2.…”

Section: Literature Reviewmentioning

confidence: 99%

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Direct numerical simulation of incompressible multiphase flow with phase change

Lee

Riaz

Aute

2017

Journal of Computational Physics

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Phase change problems arise in many practical applications such as air-conditioning and refrigeration, thermal energy storage systems and thermal management of electronic devices.The physical phenomenon in such applications are complex and are often difficult to be studied in detail with the help of only experimental techniques. The efforts to improve computational techniques for analyzing two-phase flow problems with phase change are therefore gaining momentum.The development of numerical methods for multiphase flow has been motivated generally by the need to account more accurately for (a) large topological changes such as phase breakup and merging, (b) sharp representation of the interface and its discontinuous properties and (c) accurate and mass conserving motion of the interface. In addition to these considerations, numerical simulation of multiphase flow with phase change introduces additional challenges related to discontinuities in the velocity and the temperature fields. Moreover, the velocity field is no longer divergence free. For phase change problems, the focus of developmental efforts has thus been on numerically attaining a proper conservation of energy across the interface in addition to the accurate treatment of fluxes of mass and momentum conservation as well as the associated interface advection.Among the initial efforts related to the simulation of bubble growth in film boiling applications the work in [1] was based on the interface tracking method using a moving unstructured mesh. That study considered moderate interfacial deformations. A similar problem was subsequently studied using moving, boundary fitted grids Among the front capturing methods, sharp interface methods have been found to be particularly effective both for implementing sharp jumps and for resolving the interfacial velocity field. However, sharp velocity jumps render the solution susceptible to erroneous oscillations in pressure and also lead to spurious interface velocities. To implement phase change, the work in [16] employed point mass source terms derived from a physical basis for the evaporating mass flux. To avoid numerical instability, the authors smeared the mass source by solving a pseudo time-step diffusion equation. This measure however led to mass conservation issues due to non-symmetric integration over the distributed mass source region. The problem of spurious pressure oscillations related to point mass sources was also investigated by [17]. Although their method is based on the VOF, the large pressure peaks associated with sharp mass source was observed to be similar to that for the interface tracking method.Such spurious fluctuation in pressure are essentially undesirable because the effect is globally transmitted in incompressible flow. Hence, the pressure field formation due to phase change need to be implemented with greater accuracy than is reported in current literature.The accuracy of interface advection in the presence of interfacial mass flux (mass flux conservation) has been discussed in [14,18]. ...

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“…In Fig. 64, the normalized bubble tip velocity is plotted as a function of were reported in [77,92]. In Fig.…”

Section: Reference Casementioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

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Direct numerical simulation of incompressible multiphase flow with phase change

Lee

Riaz

Aute

2017

Journal of Computational Physics

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“…Many numerical studies to date have contributed to improved understanding of two-phase slug flow in small channels [12][13][14][15][16][17][18][19][20][21][22][23][24]. Kreutzer et al [21] investigated the influence of both the Capillary and Reynolds numbers on film thickness, pressure drop, and liquid flow patterns.…”

Section: Introductionmentioning

confidence: 99%

“…The variation of film thickness at the middle of the slug, and a correlation to predict the pressure drop across the slug, were obtained for 0.002 < Ca < 0.04 and 0 < Re < 900. Gupta et al [22] compared the volume of fluid (VOF) and level set (LS) interface tracking methods for simulating liquid-gas slug flow and heat transfer; both methods provided physically accurate results. The VOF method required a higher grid resolution, and the LS method a smaller time step, to accurately predict the flow field.…”

Section: Introductionmentioning

confidence: 99%

Spurious Current Suppression in VOF-CSF Simulation of Slug Flow through Small Channels

Zhang

Weibel

Garimella

2014

Numerical Heat Transfer, Part A: Applications

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A numerical treatment is proposed to minimize the creation of unphysical, spurious currents in modeling liquid-gas slug flow using the volume of fluid-continuum surface force (VOF-CSF) method. An elongated gas slug drawn into a small circular channel initially filled with liquid is considered. To suppress spurious currents formed by numerical errors in calculation of the surface tension force at small Capillary numbers (Ca < 0.01), an artificial relative reference frame is specified with motion in a direction opposite that of the flow. An increase in the local relative velocity magnitude near the interface is demonstrated to be the key mechanism for spurious

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Design methodology for barrier‐based two phase flow distributor

et al. 2012

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The barrier‐based distributor is a multiphase flow distributor for a multichannel microreactor which assures flow uniformity and prevents channeling between the two phases. For N number of reaction channels, the barrier‐based distributor consists of a gas manifold, a liquid manifold, N barrier channels for the gas, N barrier channels for the liquid, and N mixers for mixing the phases before the reaction channels. The flow distribution is studied numerically using a method based on the hydraulic resistive networks (RN). The single phase hydraulic RN model (Commenge et al., 2002;48:345–358) is extended for two phases gas‐liquid Taylor flow. For ReGL <30, the accuracy for the model was above 90%. The developed‐model was used to study the effects of fabrication tolerance and barrier channel dimensions. A design methodology has been proposed as an algorithm to determine the required hydraulic resistance in the barrier channels and their dimensions. This methodology is demonstrated using a numerical example. © 2012 American Institute of Chemical Engineers AIChE J, 2012

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CFD modelling of flow and heat transfer in the Taylor flow regime

Cited by 127 publications

References 54 publications

Direct numerical simulation of incompressible multiphase flow with phase change

Direct numerical simulation of incompressible multiphase flow with phase change

Spurious Current Suppression in VOF-CSF Simulation of Slug Flow through Small Channels

Design methodology for barrier‐based two phase flow distributor

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