Numerical study of hydrodynamic and heat transfer characteristics of gas-liquid Taylor flow in a 0.5 mm capillary

doi:10.11949/j.issn.0438-1157.20160617

CIESC Journal ›› 2016, Vol. 67 ›› Issue (S1): 127-133.DOI: 10.11949/j.issn.0438-1157.20160617

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Numerical study of hydrodynamic and heat transfer characteristics of gas-liquid Taylor flow in a 0.5 mm capillary

SHI Yanping¹, ZHANG Jingzhi^2,3, LI Wei²

1 Shanxi Fenxi Heavy Industry Co., Ltd., Taiyuan 030027, Shanxi, China;
2 College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China;
3 Collaborative Innovation Center of Advanced Aero-Engine, College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received:2016-05-09 Revised:2016-05-19 Online:2016-08-31 Published:2016-08-31
Supported by:
supported by the National Science Foundation of Zhejiang Province (LZ13E060001) and the National Natural Science Foundation of China (51210011).

0.5 mm毛细管内气-液Taylor流动换热数值研究

师艳平¹, 张井志^2,3, 李蔚²

1 山西汾西重工有限责任公司, 山西太原 030027;
2 浙江大学能源工程学院, 浙江杭州 310027;
3 浙江大学能源工程学院先进航空发动机协同创新中心, 浙江杭州 310027

通讯作者: 李蔚,weili96@zju.edu.cn
基金资助:
浙江省自然科学基金项目（LZ13E060001）；国家自然科学基金国际合作项目（51210011）。

Abstract

Abstract:

The hydrodynamic and heat transfer characteristics of the fully-developed gas-liquid Taylor flow in a 0.5 mm capillary were studied numerically using the moving frame method. The bubble shapes, pressure drops and heat transfer characteristics were analyzed. The numerical results show that the liquid film thickness, the bubble length and the length of the unsteady region near the bubble tail increase with increasing Re. The effect of void fraction ξ_g on the bubble shapes is insignificant, while a longer bubble is expected at a higher ξ_g. The frictional factor f which is higher than the single-phase flow decreases with increasing Re and ξ_g. The average Nusselt number increases with increasing Re, while the increasing trend decreases with increasing Re. Nu_tp decreases linearly with increases in ξ_g and Nu_tp is about 1.2 to 3 times of that for the single-phase flow which means that Taylor flow can enhance heat transfer.

Key words: Taylor flow, microchannels, numerical simulation, dynamic mesh, heat transfer

摘要：

采用移动计算域方法研究0.5 mm毛细管内充分发展的气液Taylor流动换热特性，分析了Taylor气泡的形状、压降与换热特性。结果表明，随着入口Reynolds数Re的增大，气泡尾部的不稳定区域增大，液膜厚度逐渐增大，气泡长度变长；随着气泡体积分数ξ_g的增大，气泡形状基本不变而长度逐渐增大。阻力因子f随Re、ξ_g增大而降低，两相阻力系数高于单相的情况。平均Nusselt数Nu_tp随Re增大而增大，增大趋势逐渐降低；随ξ_g增大而线性降低。Taylor流的Nu_tp为单相的1.2～3倍，强化换热效果。

关键词: Taylor流, 微通道, 数值模拟, 动网格, 传热

CLC Number:

TK124

SHI Yanping, ZHANG Jingzhi, LI Wei. Numerical study of hydrodynamic and heat transfer characteristics of gas-liquid Taylor flow in a 0.5 mm capillary[J]. CIESC Journal, 2016, 67(S1): 127-133.

师艳平, 张井志, 李蔚. 0.5 mm毛细管内气-液Taylor流动换热数值研究[J]. 化工学报, 2016, 67(S1): 127-133.

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Numerical study of hydrodynamic and heat transfer characteristics of gas-liquid Taylor flow in a 0.5 mm capillary

0.5 mm毛细管内气-液Taylor流动换热数值研究

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