不同压力下具有内热源的包装箱内传热特性

Heat Transfer Characteristics of a Product with an Inner Heat Source in a Packaging Container under Different Pressures

目的研究具有内热源的某产品包装箱在不同压力下的传热特性。方法搭建具有内热源的某产品包装箱传热特性实验系统,对不同压力下内部具有热源的某产品包装箱内的温度场进行测量,讨论产品各部件的传热特性,并基于计算结果,拟合各部件的传热关联式。结果常压状态下各测点温度较低压状态更易达到平衡,箱体内温度场的分布符合被加热物四周热边界层厚度分布规律。包装箱内对流传热能力随着压强的增大而增强,且箱内压强处于较小范围时,压强的增加对于箱内各部的冷却效果更加显著。结论正常工作的温度范围内,该产品包装箱内传热能力的强弱主要受对流传热影响,对流传热能力随着压强的增大而增强;得到了各部件壁面传热关联式,误差在5%以内。

This work aimed to investigate the heat transfer characteristics of a product with an inner heat source in a packaging container at different pressures. The experimental system of heat transfer characteristics in a packaging container was set up to test the temperature field of a product with an inner heat source in a packaging container under different pressures. The heat transfer characteristics of different parts of the product were discussed and the empirical heat transfer correlations were proposed based on the experimental results. The temperatures of various measure points reached equilibrium more easily under constant pressure than those under low pressure, and the distribution of the temperature field was consistent with the principles of the distribution of thermal boundary layer thickness of heated objects. The convective heat transfer ability was enhanced with the increase of the pressure, and the effect was more significant in a small pressure range. In the normal range of working temperature, the convective heat transfer affected the heat transfer ability of the packaging container greatly, and the convective heat transfer ability was enhanced with the increase of pressure. The empirical heat transfer correlations were obtained within 5% deviation.