王瑞星;刘斌;申志远;董小勇;
WANG Rui-xing;LIU Bin;SHEN Zhi-yuan;DONG Xiao-yong;Tianjin Key Lab of Refrigeration Technology,Tianjin University of Commerce;

• 1:天津市制冷技术重点实验室天津商业大学

摘要(Abstract)：

改善蒸发器表面温度场的均匀性对提高其换热效率具有决定性作用。设计出一种类似平行流蒸发器的圆管单流程蒸发器,改变其集液管和蒸发管衔接处的孔径大小以及制冷剂入口流速,并进行了蒸发器管路的水力计算和相应的实验研究,得出管路中间截面的温度分布。模拟结果表明:在结构一定的条件下,集液管内的制冷剂来流速度具有决定性作用。当集液管内的来流速度在0.04m/s时,蒸发器各支管的温度分布最为均匀;同时在制冷剂流量一定时,支管数及各蒸发管与集液管衔接处的孔径大小也影响着温度分布。试验结果证明了此结论:在一定的液态制冷剂集管入口流速下,最小孔径为0.4mm时,具有8根支管的单流程蒸发器比10根支管的单流程蒸发器具有均匀的温度场。研究结果为研发高效率的平行流蒸发器提供了一定的理论和试验基础。
For evaporator,improving its surface temperature field uniformity plays a key role in its heat transfer efficiency. We designed a circular tube single flow evaporator similar to the parallel flow evaporator. The temperature distribution of the middle section of the evaporator was obtained by the hydraulic calculation of evaporator and the corresponding experiment under different working conditions including different diameter of the pore connecting the collection tube and the evaporator tube and different inlet velocity of the refrigerant in the collection tube. The simulation results show that the inlet velocity of collection tube counts much for a fixed structure evaporator. When the inlet velocity is 0. 04 m / s,the temperature distribution is more uniform. If the refrigerant flow is fixed,the pore size affects the temperature distribution. The experimental results show that in a certain inlet velocity,the temperature field of the evaporator with 8 tubes is more uniform than that of the evaporator with 10 tubes when the smallest pore size is 0. 4mm. The results provide theoretical and experimental basis for the development of high efficient parallel flow evaporator.

关键词(KeyWords)： 热工学;数值模拟;单流程蒸发器;温度场均匀性
thermal engineering;numerical simulation;parallel flow evaporator;temperature field uniformity

Abstract:

Keywords:

基金项目(Foundation): 十二五国家科技支撑计划重点资助项目(2011BAD24B01);; 天津市科技支撑资助项目(142C2DNC00016)

作者(Author): 王瑞星;刘斌;申志远;董小勇;
WANG Rui-xing;LIU Bin;SHEN Zhi-yuan;DONG Xiao-yong;Tianjin Key Lab of Refrigeration Technology,Tianjin University of Commerce;

Email:

DOI:

参考文献(References)：

• [1]韩清,张驰,徐博,等.制冷剂分液器分配特性的实验研究[J].制冷学报,2014,35(3):1-7.
• [2]李夔宁,吴小波,尹亚领.平行流蒸发器内气液两相流分配均匀性实验研究[J].热能动力工程,2009,24(6):759-765.
• [3]鲁洪亮,陶红歌,胡云鹏,等.平行流换热器中热流体分布均匀性的研究进展[J].制冷学报,2010,31(6):39-45.
• [4]李越峰,陈俊智,王晰.平行流换热器在家用空调的应用和分析[J].制冷技术应用专题,2008,19:46-48.
• [5]Ahmad Mohammad,Berthoud Georges,Mercier Pierre.General characteristics of two-phase flow distribution in a compact heat exchanger[J].International Journal of Heat and Mass Transfer,2009,52(1-2):442-450.
• [6]Lee Jun Kyoung.Lee Sang Yong.Distribution of twophase annular flow at header-channel junctions[J].Experimental Thermal and Fluid Science.2004,28(2-3):217-222.
• [7]Horiki Sachiyo,Nakamura Tomoshige,Osakabe Massahiro.Thin flow header to distribute feed water for compact heat exchanger[J].Experimental Thermal and Fluid Science,2004,28(2-3):201-207.
• [8]Kulkami Tushar,Bullard Clar W,Cho Keumanm.Header design trade-offs in microchannel evaporator[J].Applied Thermal Engineering,2004,24:759-776.
• [9]Habib M A,Ben-Mansour R,Said S A M,et al.Evaluation of flow maldistribution in air-cooled heat exchangers[J].Computers&Fluids,2009,38(3):677-690.
• [10]梁雨迎,诸凯,张莹.带有强化冷凝段的热管散热器三维温度场数值模拟分析[J].流体机械,2013,41(1):87-90.
• [11]孙艳,魏峰.自然循环蒸发器内流动和传热的数值模拟研究[J].流体机械,2012,40(9):58,83-85.
• [12]周怒潮,邵虎跃,贺小华.刮板结构对薄膜蒸发器内气液两相液膜流场影响分析[J].压力容器,2013,30(4):33-38.
• [13]田雪娇,刘晨,张丽萍.植物乳杆菌LY-78发酵液在牛肉贮藏中的应用[J].包装与食品机械,2013,31(2):23-26.
• [14]穆传冰.旋风除尘器的结构设计与内部流场数值模拟[J].化工设备与管道,2013,(5):38-43.
• [15]周森泉,过增元,胡桅林,等.来流温度速度不均匀时换热器效能的分析[J].工程热物理学报.1994,15(4):403-407.