多支管并联蒸发联箱流量分配特性分析  

Investigation of the Flow Distribution in Parallel Evaporating Branches of a Separate Heat Pipe

作　　者：罗云[1] 王文[1] 左巧林[2] 叶成[2] Luo Yun;Wang Wen;Zuo Qiaolin;Ye Cheng(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai,200240,China;Shanghai Nuclear Engineering Research&Design Institute,Shanghai,200233,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]上海核工程研究设计院,上海200233

出　　处：《制冷学报》2019年第6期27-33,共7页Journal of Refrigeration

基　　金：科技部重大专项(2015ZX06004002)资助项目~~

摘　　要：基于分离式热管在一定温度水池中的应用,本文采用流体体积函数(VOF)模型就两种不同热流边界条件对蒸发段7根并联支管中的流量分配特性进行了CFD两相仿真计算。在CFD计算中,对连续性方程添加了蒸发源项,而对动量方程添加了表面张力源项。结果表明:在较低热流条件下(外界水池温度为60℃),各支管的流量分配呈现联箱两封头处支管流量大中间支管偏小的特点,其中支管1的质量流量最大约为0. 025 kg/s,支管4内的质量流量最小约为0. 016 kg/s;在较高热流条件下(外界水池温度为80℃),各支管的流量沿着下联箱中工质流动方向逐渐减小,其中支管1的质量流量最大约为0. 025 kg/s,支管7内的质量流量最小约为0. 017 kg/s。对比分析仿真计算结果与并联分离型热管实验数据,实验中热负荷对各支管流量分配的影响趋势与仿真结果相吻合。A two-phase computational fluid dynamics(CFD) simulation of seven parallel evaporating branches in a separate heat pipe with two different heat loads was conducted with ther volume of fluid(VOF) model,and the flow distribution characteristics was assessed in the study. In the CFD calculation,the evaporation source term is added to the continuity equation while the surface tension source term is added to the momentum equation. The simulation results show that(1) at a lower heat load with a pool temperature of 60 ℃,the mass flow rate is higher in the branches of the two sides and smaller in the middle,and branch 1 has the highest mass flow rate of 0.025 kg/s while branch 4 has the lowest mass flow rate of 0.016 kg/s;(2) at a higher heat load with the pool temperature at 80 ℃,the mass flow rate of each branch is gradually reduced along the flow direction,where branch 1 has the highest mass flow rate of 0. 025 kg/s while branch 7 has the lowest mass flow rate of 0.017 kg/s. The simulation results are compared to the experimental results regarding parallel branches of separation heat pipes,and the comparison shows that the effect of the heat load on the flow distribution in the simulation results is consistent with the experimental ones.

关 键 词：分配特性 热负荷 数值模拟 流体体积函数 分离式热管 

分 类 号：TK172.4[动力工程及工程热物理—热能工程] TK124