泡沫金属换热器开发及性能研究

根据泡沫金属换热器的结构特点和强化换热原理,采用数值模拟的方法,研究了泡沫金属区域内部流动和传热特性。从阻力特性、换热系数、压降损失等方面分析泡沫金属换热器的换热性能。研究发现,改变泡沫金属换热材料的高宽比、空气流速和孔隙率,都能改变换热器的换热性能。结果表明,泡沫金属可以提高换热器的换热效率,但是压力损失很大,改变孔隙率和泡沫金属结构能够调节其压力损失,提高换热器的综合换热性能。

Development and performance study of foamed metal heat exchanger

According to the structural characteristics and the principle of enhanced heat transfer of the metal foam heat exchanger, the internal flow and heat transfer characteristics of the metal foam region were studied by numerical simulation. The heat transfer performance of the foam metal heat exchanger was analyzed from the aspects of resistance characteristics, heat transfer coefficient and pressure drop loss. It is found that changing the aspect ratio, air flow rate and porosity of the metal foam material can change the heat transfer performance of the heat exchanger. The results show that foam metal can improve the heat transfer efficiency of heat exchangers, but the pressure loss is very large. The changes of porosity and foam metal structure can adjust the pressure loss and improve the comprehensive heat transfer performance of the heat exchanger.