捕捉微通道内Taylor流特性的一种渐变网格划分方法

摘要

提出了一种适用于捕捉通道内Taylor流液膜厚度的渐变网格划分方法。为了平衡模拟精度和计算效率，提出了针对此方法的具体规则来获得一种高效的网格划分。利用CFD软件Fluent进行了一系列的二维数值模拟，采用VOF模型来捕捉微通道内气液两相界面，所用微通道横截面宽度分别为0.1，0.2，0.3，0.4，0.5，0.8和1.0mm。采用提出的网格划分方法获得的模拟结果与关联式计算值和实验数据很接近。基于模拟结果，提出了新的气液弹长度的关联式，并且利用实验数据对此关联式进行了验证。

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	李根浩
	袁希钢
	宋文琦

关键词： Taylor流；微通道；数值模拟；网格划分；气液弹长度

Abstract：

This study is focused on a gradient mesh approach to capture the characteristics of Taylor flow.To balance the numerical accuracy and the computing efficiency, appropriate rules for the approach are newly proposed to determine an effective mesh arrangement.Series of two-dimensional simulations were performed with CFD software, Fluent, and the volume of fluid (VOF) model was applied to capture the gas-liquid two phase interface in T-junction microchannels with varying cross-sectional width (0.1, 0.2, 0.3, 0.4, 0.5, 0.8 and 1.0 mm).The hydrodynamic characteristics of Taylor flow obtained with the application of our rules for the mesh approach are shown to be in good agreement with existing correlation values and experimental data. New correlations of slug length were also proposed based on the simulations.The correlations are validated with the experimental slug lengths.

Keywords： Taylor flow； microchannel； numerical simulation； mesh approach； slug length

Received 2014-08-20;

Fund:

Supported by the National Natural Science Foundation of China (20911130358).

Corresponding Authors: Yuan Xigang, E-mail: address:yuanxg@tju.edu.cn. Email: address:yuanxg@tju.edu.cn

引用本文:

李根浩, 袁希钢, 宋文琦.捕捉微通道内Taylor流特性的一种渐变网格划分方法[J]. 化学工业与工程, 2016,33(5): 86-95

Li Genhao, Yuan Xigang, Song Wenqi .Gradient Mesh Approach for Capturing Characteristics of Gas-Liquid Taylor Flow in Microchannels[J]. Chemcial Industry and Engineering, 2016,33(5): 86-95

[1] Abdul-Razzak A, Shoukri M, Chan A M C.Two-Phase flow regimes during the rewetting and refilling of hot horizontal tubes[J]. Exp Therm Fluid Sci, 1990, 3(3): 330-337
[2] Cha J, Ahn Y, Kim M. Flow measurement with an electromagnetic flowmeter in two-phase bubbly and slug flow regimes[J].Flow Meas Instrum, 2002, 12(5/6): 329-339
[3] Jassim E W, Newell T A,Chato J C. Prediction of two-phase condensation in horizontal tubes using probabilistic flow regime maps[J]. Int J Heat Mass Transfer, 2008, 51(3/4): 485-496
[4] Triplett K A,Ghiaasiaan S M,Abdel-Khalik S I,et al. Gas-liquid two-phase flow in microchannels Part I: Two-phase flow patterns[J].Int J Multiphase Flow, 1999, 25(3): 377-394
[5] Akbar M K, Plummer D A, Ghiaasiaan S M. On gas-liquid two-phase flow regimes in microchannels[J].Int J Multiphase Flow, 2003, 29(5): 855-865
[6] Thulasidas T C, Abraham M A, Cerro R L. Flow patterns in liquid slugs during bubble-train flow inside capillaries[J]. Chem Eng Sci, 1997, 52(17): 2 947-2 962
[7] Salman W, Gavriilidis A,Angeli P. A model for predicting axial mixing during gas-liquid Taylor flow in microchannels at low Bodensteinnumbers[J]. Chem Eng J, 2004, 101(1/3):391-396
[8] Adeosun J T,Lawal A. Numerical and experimental studies of mixing characteristics in a T-junction microchannel using residence-time distribution[J]. Chem Eng Sci, 2009, 64(10):2 422-2 432
[9] Gupta R, Fletcher D F, Haynes B S.On the CFD modelling of Taylor flow in microchannels[J]. Chem Eng Sci, 2009, 64(12): 2 941-2 950
[10] Aubin J, Ferrando M,Jiricny V. Current methods for characterising mixing and flow in microchannels[J]. Chem Eng Sci, 2010, 65(6): 2 065-2 093
[11] Giavendoni M D, Saita F A. The rear meniscus of a long bubble steadily displacing a Newtonian liquid in a capillary tube[J]. Phys Fluids,1999, 11 (4): 786-794
[12] van Baten J M, Krishna R. CFD simulations of mass transfer from Taylor bubbles rising in circular capillaries[J]. Chem Eng Sci, 2004, 59(12): 2 535-2 545
[13] Irandoust S,Andersson B.Simulation of flow and mass transfer in Taylor flow through a capillary[J].Comput Chem Eng,1989, 13(4/5): 519-526
[14] Qian D,Lawal A.Numerical study on gas and liquid slugs for Taylor flow in a T-junction microchannel[J].Chem Eng Sci, 2006,61(23): 7 609-7 625
[15] Olsson E,Kreiss G. A conservative level set method for two phase flow [J]. J Comput Phys, 2005, 210(1): 225-246
[16] Yue P, Zhou C, Feng J J,et al. Phase-Field simulations of interfacial dynamics in viscoelastic fluids using finite elements with adaptive meshing[J]. J Comput Phys, 2006, 219(1): 47-67
[17] Yu Z, Hemminger O, Fan L. Experiment and lattice Boltzmann simulation of two-phase gas-liquid flows in microchannels[J]. Chem Eng Sci,2007, 62(24): 7 172-7 183
[18] Kumar V, Vashisth S, Hoarau Y, et al. Slug flow in curved microreactors: Hydrodynamic study[J]. Chem Eng Sci, 2007, 62(24): 7 494-7 504
[19] Kashid M N, Agar D W. Hydrodynamics of liquid-liquid slug flow capillary microreactor: Flow regimes, slug size and pressure drop[J]. Chem Eng J, 2007, 131(1): 1-13
[20] Hazel A L, Heil M. The steady propagation of a semi-infinite bubble into a tube of elliptical or rectangular cross-section[J]. J Fluid Mech, 2002, 470: 91-114
[21] Brackbill J U, Kothe D B, Zemach C. A continuum method for modeling surface tension[J]. J Comput Phys, 1992, 100(2): 335-354
[22] Han Y, Shikazono N, Kasagi N. Measurement of liquid film thickness in a micro parallel channel with interferometer and laser focus displacement meter[J]. Int J Multiphase Flow, 2011, 37(1): 36-45
[23] Bretherton F P. The motion of long bubbles in tubes[J]. J Fluid Mech, 1961, 10(2): 166-188
[24] Han Y, Shikazono N. Measurement of the liquid film thickness in micro tube slug flow[J]. Int J Heat Fluid Flow, 2009, 30(5): 842-853
[25] Warnier M J F, Rebrov E V, De Croon M, et al. Gas hold-up and liquid film thickness in Taylor flow in rectangular microchannels[J]. Chem Eng J, 2008, 135: S153-S158
[26] Kreutzer M T, Kapteijn F, Moulijn J A, et al. Inertial and interfacial effects on pressure drop of Taylor flow in capillaries[J]. AIChE J, 2005, 51(9): 2 428-2 440
[27] Santos R M, Kawaji M. Numerical modeling and experimental investigation of gas-liquid slug formation in a microchannel T-junction[J]. Int J Multiphase Flow, 2010, 36(4): 314-323
[28] Berěiě G, Pintar A. The role of gas bubbles and liquid slug lengths on mass transport in the Taylor flow through capillaries[J]. Chem Eng Sci, 1997, 52(21): 3 709-3 719
[29] Vandu C O, Liu H, Krishna R. Mass transfer from Taylor bubbles rising in single capillaries[J]. Chem Eng Sci, 2005, 60(22): 6 430-6 437
[30] Heiszwolf J J, Kreutzer M T, van den Eijnden M G, et al. Gas-Liquid mass transfer of aqueous Taylor flow in monoliths[J]. Catal Today, 2001, 69(1): 51-55
[31] Mantle M D, Sederman A J, Gladden L F, et al. Dynamic MRI visualization of two-phase flow in a ceramic monolith [J]. AIChE J, 2002, 48(4): 909-912
[32] Kreutzer M T, Eijnden M G, Kapteijn F, et al. The pressure drop experiment to determine slug lengths in multiphase monoliths[J]. Catal Today, 2005, 105(3): 667-672
[33] Laborie S, Cabassud C, Durand-Bourlier L, et al. Characterisation of gas-liquid two-phase flow inside capillaries[J]. Chem Eng Sci, 1999, 54(23): 5 723-5 735
[34] Sobieszuk P, Cygański P, Pohorecki R. Bubble lengths in the gas-liquid Taylor flow in microchannels[J]. Chem Eng Res Des, 2010, 88(3): 263-269