乙烷脉动热管的CFD数值模拟研究及实验对比

CFD Numerical Simulation Research and Experimental Comparison of an Ethane Pulsating Heat Pipe

为了更好地了解脉动热管内部的内在运行机制,本文在实验的基础上采用VOF模型对乙烷脉动热管的传热特性进行了数值模拟研究。结果表明:充注工质后,脉动热管内部形成了随机的气液分布;在启动过程和稳定运行过程中,温度波动的频率随着加热功率的增大而增大;在稳定运行过程中,脉动热管内的流型也在不停地变化。将模拟结果与前期的实验结果进行了对比,验证了所采用的数值模拟方法的适用性。

To better understand the operating mechanism of the pulsating heat pipe,the heat transfer and flow characteristic of ethane pulsating heat pipe based on the experiment was numerically investigated by using the VOF model.The simulation results showed that the random distribution of vapor and liquid phase in the pulsating heat pipe tubes had been formed after charging the working fluid.When the pulsating heat pipe started up and worked stably,the time of single periodical pulsating of temperature was decreased with the increasing of the heat load.In addition,the flow pattern in the tube of the pulsating heat pipe was also changing constantly when the pulsating heat pipe worked stably.The simulation results were compared with the previous experimental results,which proved that the numerical simulation method used in this paper is applicability feasibility.