微细管道内R141b沸腾气液两相流动与换热特性数值仿真 *

推进技术 ›› 2018, Vol. 39 ›› Issue (4): 802-809.

微细管道内R141b沸腾气液两相流动与换热特性数值仿真 *

李琳¹,刘存良¹,杨祺²,朱惠人¹

西北工业大学动力与能源学院，陕西西安 710072,西北工业大学动力与能源学院，陕西西安 710072,兰州空间技术物理研究院真空技术与物理重点实验室，甘肃兰州 730000,西北工业大学动力与能源学院，陕西西安 710072

发布日期:2021-08-15
作者简介:李琳，女，博士生，研究领域为航空发动机高温部件高效冷却。E-mail: lilin199207@126.com 通讯作者:刘存良，男，博士，教授，研究领域为航空发动机高温部件高效冷却。
基金资助:
国家自然科学基金(51776173)；陕西省自然科学基础研究计划资助项目(2017JM5044)；航天科技支撑资助项目。

Numerical Simulations on Two-Phase Boiling Flow and Heat Transfer of Refrigerant R141b in Micro/Mini-Channel

School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China,School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China,Science and Technology on Vacuum Technology and Physics Laboratory，Lanzhou Institute of Physics，Lanzhou 730000，China and School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China

Published:2021-08-15

摘要/Abstract

摘要： 为探究微尺度管道内沸腾气液两相流动与换热机理，采用基于VOF多相流模型的数值方法研究了制冷剂R141b在水平微细管道内的流动沸腾换热过程，获得了制冷剂R141b在管道内的流型、温度、速度及表面传热系数分布，分析了制冷剂R141b在管道内流动沸腾换热的基本规律和气泡运动特点。研究表明，制冷剂R141b在微细管道内流动沸腾依次出现单相流，泡状流，受限泡状流，弹状流，间歇状流，雾状流等典型流型。制冷剂R141b在微细管道内温度沿轴向逐渐升高，速度沿轴向逐渐增大，表面传热系数沿轴向先增大后减小。由于质量流速的增大使得制冷剂气相和液相的流动速度增加，表面传热系数随之增大:相同热流密度下，计算的大质量流速工况较小质量流速工况的表面传热系数平均增幅为21.4%；热流密度的增大会加快制冷剂液相向气相转变的速度，表面传热系数随之增大:相同质量流速下，计算的大热流密度工况较小热流密度工况的表面传热系数平均增幅为23.9%。

关键词: 微细管道；沸腾换热；传热系数；数值仿真；制冷剂

Abstract: In order to investigate the flow and heat transfer mechanism of gas-liquid two-phase in micro/mini-channel，the flow boiling heat transfer of the refrigerant R141b in horizontal micro/mini-channel was simulated using VOF multiphase flow model. The distribution of two-phase flow regimes，temperature，velocity and boiling heat transfer coefficients were obtained. The characteristics of the flow boiling heat transfer and bubble movement were analyzed. The results show that two-phase flow pattern maps in horizontal micro/mini-channels include single phase flow，bubbly flow，confined bubble flow，slug flow，intermittent flow，mist flow，and so on. Vapor quality，temperature and velocity increase gradually along the axial direction，the boiling heat transfer coefficients increase firstly and begin to decrease after the peaks. As the increase of the mass velocity and heat flux，boiling heat transfer coefficient increase significantly. This is because that the flow velocity of the refrigerant increases with the increasing mass flux and the velocity of liquid phase transition to gas phase increases with the increasing heat flux. On the same conditions of heat flux，the heat transfer coefficient in the conditions of large mass flux increased 21.4% averagely than the small mass flux. On the same conditions of mass flux，the heat transfer coefficient in the conditions of large heat flux increased 23.9% averagely than the conditions of small heat flux.

Key words: Micro/mini-channel；Boiling heat transfer；Heat transfer coefficient；Numerical simulation；Refrigerant

李琳,刘存良,杨祺,朱惠人. 微细管道内R141b沸腾气液两相流动与换热特性数值仿真 *[J]. 推进技术, 2018, 39(4): 802-809.

LI Lin¹,LIU Cun-liang¹,YANG Qi²,ZHU Hui-ren¹. Numerical Simulations on Two-Phase Boiling Flow and Heat Transfer of Refrigerant R141b in Micro/Mini-Channel[J]. Journal of Propulsion Technology, 2018, 39(4): 802-809.

参考文献

[1] Yang Z, Peng X F, Ye P. Numerical and Experimental Investigation of Two Phase Flow during Boiling in a Coil Tube[J]. International Journal of Heat and Mass Transfer, 2008, 51(5-6): 1003-1016.
[2] Kew P, Cornwell K. Correlations for the Prediction of Boiling Heat Transfer in Small Diameter Channels[J]. Applied Thermal Engineering, 1997, 17(8-10): 705-715.
[3] Bertsch S S, Groll E A, Garimella S V. Refrigerant Flow Boiling Heat Transfer in Parallel Micro-Channels as a Function of Local Vapor Quality[J]. International Journal of Heat and Mass Transfer, 2008, 51(19-20): 4775-4787.
[4] Coleman J W, Garimella S. Characterization of Two-Phase Flow Patterns in Small Diameter Round and Rectangular Tubes[J]. International Journal of Heat and Mass Transfer, 1999, 42(15): 2869-2881.
[5] 张小艳, 袁秀玲. R417A在水平光滑管和内螺纹管中的流动沸腾换热[J]. 西安交通大学学报, 2007, (1): 18-22.
[6] 葛琪林, 柳建华. R290 微通道内沸腾换热实验研究[J]. 热能动力工程, 2015, 30(5): 672-817.
[7] 张良, 柳建华, 叶方平. 细微通道内低温CO₂流动沸腾换热特性研究[J]. 热能动力工程, 2014, 29(3): 262-266.
[8] 郭雷, 张树生, 程林. 竖直矩形细通道内水沸腾换热的数值模拟[J]. 热能动力工程, 2011, 26(1): 31-35.
[9] 琚忠云, 周涛. 窄通道内水沸腾换热的数值模拟研究[J]. 工业安全与环保, 2014, 40(8): 5-11.
[10] 王志奇, 夏小霞. 水平管内制冷剂沸腾传热特性的数值模拟[J]. 工业加热, 2015, 44(1): 32-34.
[11] 黄秀杰. R32在微细通道内流动沸腾特性的实验及数值研究[D]. 北京:清华大学, 2013.
[12] 郑杰, 朱惠人, 郭涛. 微尺度冲击冷却通道换热特性实验研究[J]. 推进技术, 2015, 36(1): 82-88. (ZHENG Jie, ZHU Hui-ren, GUO Tao. Experimental Investigation on Jet Impingement Heat Transfer for Micro-Channel[J]. Journal of Propulsion Technology, 2015, 36(1): 82-88.)
[13] 吴峰, 王秋旺, 罗来勤, 等. 液体火箭发动机推力室冷却通道流动与传热数值研究[J]. 推进技术, 2005, 26(5): 389-393. (WU Feng, WANG Qiu-wang, LUO Lai-qin, et al. Numerical Investigation of Heat Transfer and Fluid Flow in Cooling Channel of Liquid Rocket Engine Thrust Chamber[J]. Journal of Propulsion Technology, 2005, 26(5): 389-393.)
[14] 姜玉廷, 郑群, 罗铭聪. 叶片前缘两相流冲击冷却的耦合数值模拟[J]. 推进技术, 2015, 36(3): 443-449. (JIANG Yu-ting, ZHENG Qun, LUO Ming-cong.Congjugate Simulation of Two Phase Flow Impingement Cooling on Blade Leading Edge[J]. Journal of Propulsion Technology, 2015, 36(3): 443-449.)
[15] Swapna S R, Vivek V B. Volume-of-Fluid (VOF) Simulations of Rise of Single/Multiple Bubbles in Sheared Liquids[J]. Chemical Engineering Science, 2010, (65): 527-537.
[16] Brackbill J U, Kothe D B, Zemach C. A Continuum Method of Modeling Surface Tension[J]. Journal of Computational Physics, 1992, 10(2): 335-354.
[17] Lee W H. A Pressure Iteration Scheme for Two-Phase Flow Modeling[R]. LA-UR-79-975.
[18] Lin S, Kew P A, Cornwell K. Two-Phase Heat Transfer to a Refrigerant in a 1mm Diameter Tube[J]. International Journal of Refrigeration, 2001, (24): 51-56.
[19] 常威. 矩形细通道内流动沸腾特性分析及实验研究[D]. 山东:山东大学, 2012.　　　　　　　　　　　　　*　收稿日期:2016-12-24；修订日期:2017-03-06。基金项目:国家自然科学基金(51776173)；陕西省自然科学基础研究计划资助项目(2017JM5044)；航天科技支撑资助项目。作者简介:李琳,女,博士生,研究领域为航空发动机高温部件高效冷却。E-mail: lilin199207@126.com通讯作者:刘存良,男,博士,教授,研究领域为航空发动机高温部件高效冷却。E-mail: liucunliang@nwpu.edu.cn(编辑:张荣莉)