CIESC Journal ›› 2017, Vol. 68 ›› Issue (8): 3030-3038.doi: 10.11949/j.issn.0438-1157.20170064

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Pressure evolution and interface movement of slug flow during micro-channel modulation process

CHEN Hongxia1,2, HUANG Linbin1, GONG Yifei1   

  1. 1 School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China;
    2 Beijing Key Laboratory of Multiphase Flow and Heat Transfer, Beijing 102206, China
  • Received:2017-01-16 Revised:2017-05-05 Online:2017-08-05 Published:2017-05-18
  • Supported by:

    supported by the National Natural Science Foundation of China(51576063) and the Universities' Basic Scientific Research of Central Authorities.

Abstract:

Slug flow separation, a traditional process in biochemical and pharmaceutical industries, is a valid method to control two-phase flow patterns and enhance heat transfer. The fundamental to study evolution mechanism of two-phase flow patterns is to understand development rules of local parameters by numeric simulation of drainage on micro-channel walls and modulation process of slug flow. The VOF model coupling with dynamic grid adaption was chosen to precisely track gas liquid interface, to simulate movement of the interface at split, and to acquire hydrostatic and dynamic pressure evolution along axial direction and at wall. Results indicated that piston-like movement of bubbles at split was critical to slug flow separation in micro channels. Because of the presence of Laplacian pressure drop at the interface, pressure drop of slug flow was discontinuous with a periodic wavy variation following the interface piston-like movement. The overall pressure drop of slug flow was influenced by local pressure drop at liquid bridge region. Significant pressure drop near bubble head while minimal pressure drop near bubble tail where liquid flow rate was reduced. Such pressure drop characteristics of slug flow is distinguished from other two phase flows.

Key words: slug flow, liquid separation, local pressure, CFD, simulation

CLC Number: 

  • TK121

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[10] CHEN H X, XU J L, XIE J, et al. Modulated flow patterns for vertical upflow by the phase separation concept[J]. Experimental Thermal and Fluid Science, 2014, 52:297-307.
[11] CHEN Q C, XU J L, SUN D L, et al. Numerical simulation of the modulated flow pattern for vertical upflows by the phase separation concept[J].International Journal of Multiphase flow, 2013,56:105-118.
[12] SOTOWA K I. Performance evaluation and integration of micro devices for singe stage distillation[D]. Japan:Kyushu University Fukuoka, 2003.
[13] FANG C, HIDROVO C, WANG F, et al. 3-D numerical simulation of contact angle hysteresis for microscale two phase flow[J]. International Journal of Multiphase Flow, 2008, 34:690-705.
[14] GUPTA R, FLETCHER D F, HAYNES B S. On the CFD modelling of Taylor flow in microchannels[J]. Chemical Engineering Science, 2009, 64:2941-2950.
[15] ZENITH F, KRAUS M, KREWER U. Model-based analysis of micro-separators for portable direct methanol fuel-cell systems[J]. Computer & Chemical Engineering, 2012, 38:64-73.
[16] WIESEGGER L E, KNAUSS R P, GUNTSCHNIG G. E, et al. Vapor-liquid phase separation in micro-/ministructured devices[J]. Chemical Engineering Science, 2013, 93:32-46.
[17] ASADI M., XIE G N, SUNDEN B. A review of heat transfer and pressure drop characteristics of single and two-phase microchannels[J]. International Journal of Heat and Mass Transfer, 2014,79:34-53.
[18] CHOI C, KIM M. Flow pattern based correlations of two-phase pressure drop in rectangular microchannels[J], International Journal of Heat Fluid Flow, 2011, 32:1199-1207.
[19] VENKATESAN M, DAS S K, BALAKRISHNAN A R. Effect of diameter on two-phase pressure drop in narrow tubes[J], Experimental. Thermal Fluid Science, 2011, 35:531-541.
[20] TAHA T, CUI Z F. Hydrodynamics of slug flow inside capillaries[J]. Chemical Engineering Science, 2004, 59(6):1181-1190.
[21] TAHA T, CUI Z F CFD modelling of slug flow inside square capillaries[J]. Chemical Engineering Science, 2006, 61(2):665-675.
[22] ZHAO Y, ORIN H, FAN L S. Experiment and lattice Boltzmann simulation of two-phase gas-liquid flows in microchannels[J]. Chemical Engineering Science, 2007, 62 (24):7172-7183.
[23] CHEN Y, KULENOVIC R, MERTZ R. Numerical study on the formation of Taylor bubbles in capillary tubes[J]. International Journal of Thermal Sciences, 2009,48(2):234-242.
[24] LANGWISCH D R, BUONGIOMO J. Prediction of film thickness, bubble velocity, and pressure drop for capillary slug flow using a CFD-generated database[J]. International Journal of Heat and Fluid Flow, 2015, 54:250-257.
[25] TAYLOR G L. Deposition of a viscous fluid on the wall of a tube[J]. Journal of Fluid Mechanics, 1961,10:161-165
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[27] BRETHERTON F P. The motion of long bubbles in tubes[J]. Journal of Fluid Mechanics, 1961,10:166-188.
[28] AUSSILLOUS P, QUERE D. Quick deposition of a fluid on the wall of a tube[J]. Physics of Fluids, 2000, 12 (10):2367-2371.
[29] CHEN H X, XU J L, YAN Y Y, et al. Phase separation and air-water flow pattern modulation by a micro-channel drainage system[J]. Applied Thermal Engineering, 2017, Accepted.
[30] 陈宏霞,黄林滨,宫逸飞. 壁面分流调控弹状流流型的CFD数值研究[C]//工程热物理会议, 广州,2016,11:11-14. CHEN H X, HUANG L B, GONG Y F, CFD study on the flow pattern modulation of slug flow by liquid separating structure on the wall[C]//Engineering thermal physical conference, Guangzhou, 2016,11:11-14.

 

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