| 摘要: |
| 基于分离式热管在一定温度水池中的应用，本文采用VOF模型就两种不同热流边界条件对蒸发段七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。 |
| 关键词: 分配特性 热负荷 数值模拟 VOF 分离式热管 |
| DOI： |
| 投稿时间：2018-11-25 修订日期：2019-03-03
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| 基金项目:科技部重大专项项目（2015ZX06004002）资助。 |
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| Investigation of the Flow Distribution in Parallel Evaporating Branches of a Separate Heat Pipe |
|
Luo Yun1, Wang Wen1, Zuo Qiaolin2, Ye Cheng2
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| (1.School of Mechanical Engineering, Shanghai Jiao Tong University;2.Shanghai Nuclear Engineering Research & Design Institute) |
| Abstract: |
| 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 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 rateof 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 rateof 0.025 kg/s while branch 7 has the lowest mass flow rateof 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 distributionin the simulation results is consistent with theexperimental ones. |
| Key words: distribution characteristics heat load numerical simulation VOF separated heat pipes |
