不锈钢板式热沉传热特性的实验与模拟研究

目的 研究流量、胀高及焊点排布方式对不锈钢板式热沉传热特性的影响。方法 搭建实验平台，加工出结构参数不同的板式热沉实验件，同时采用静力隐式算法建立相应的几何模型，通过实验与数值模拟相结合的方法，研究流量、胀高和焊点排布方式的变化对板式热沉热阻的影响规律，并分析热沉流道内部流场状态。结果 首先计算了6个工况下的热阻，发现实际换热量为540 W时，数值模拟与实验结果的最大相对误差不大于25%。然后分析了误差来源，最后得到了热沉全流道速度场与温度场的分布情况。结论 实验与模拟结果有较好的符合程度，证明了数值模拟方法的可靠性。在换热量相同时，板式热沉的热阻随流量与胀高的增大而减小，焊点为菱形排布的热沉传热性能相对更好。板式热沉内部的流场具有周期性，焊点使流体扰动增强，并形成射流和旋涡，起到了强化传热的效果。

Experiment and Simulation Research on Heat Transfer Performance of Stainless Steel Plate Heat Sink

The work aims to study the effect of flow, bulge height and solder joint arrangement on the heat transfer performance of the stainless steel plate heat sink. The experimental platform was established, and the plate heat sinks with different structural parameters were processed as the experimental specimens. Meanwhile, the corresponding geometric models were established by static implicit algorithm. Through the combination of experiment and numerical simulation, the effect rule of flow, bulge height and solder joint arrangement on thermal resistance of the plate heat sink was studied, and the internal flow field state of the heat sink was analyzed. Firstly, the thermal resistance under 6 working conditions was calculated. When the actual heat exchange was 540 W, the maximum relative error between the numerical simulation and the experimental results was not more than 25%. Then, the source of the error was analyzed. Finally, the distribution of velocity field and temperature field of the heat sink flow path was obtained. The experiment and simulation results have a good degree of compliance, which proves the reliability of the numerical simulation method. The thermal resistance of the plate heat sink decreases with the increase of the flow and bulge height when the heat exchange is the same, while the heat transfer performance under the solder joint arrangement with rhombic form is relatively better. The internal flow field of the plate heat sink is periodic, and the solder joints enhance the fluid disturbance and generate jets and eddies, which has the effect of strengthening heat transfer.