3D打印赋形微小流道集热器内层流换热特性数值模拟与试验研究

针对星内载荷存在大功率、多热源、高度非均匀功率密度的传散热需求,研发了一种3D打印赋形微小流道集热器.在评估了用数值模拟方法预测复杂构型微小流道集热器流动换热特性之可行性基础上,采用数值模拟与试验相结合的方法,研究流量、入口温度、热功率及重力对集热器内层流换热特性的影响,获得了集热器阻力系数与努塞尔数的经验关联式,并优...

Numerical simulation and experimental study of laminar flow and heat transfer in the 3D-printed shape follow-up minichannel thermal collector

Based on the heat transfer and dissipation in cases of high power, multi heat sources and highly non-uniform power density for some special satellite payload, a 3D-printed shape follow-up minichannel thermal collector is developed. In view of the assessed reliability of the numerical simulation method to predict the flow and heat transfer performances of the complex 3D-printed minichannel thermal collector, the effects of the flow rate, the inlet temperature, the thermal power and the gravity on the laminar heat transfer characteristics of the thermal collector are studied by the numerical simulation and the experiment, respectively. The empirical relations between the friction factor and the Nusselt number for the thermal collector are obtained, and the structure of the minichannel thermal collector is thus optimized. It is shown that with the increase of the flow rate, the pressure drop of the thermal collector increases approximately linearly, and the increase rate of the total heat transfer coefficient decreases gradually. Increasing the inlet temperature or the thermal power would reduce the pressure drop and increase the total heat transfer coefficient of the thermal collector. Gravity has little effect on the pressure drop and the total heat transfer coefficient of the minichannel thermal collector.