高孔隙率泡沫金属内空气流动与换热特性  

Air Flow and Heat Transfer Characteristics in Foam Metal with High Porosity

作　　者：孙晋洲 聂政威 陈晔[1] SUN Jinzhou;NIE Zhengwei;CHEN Ye(School of Mechanical and Power Engineering,Nanjing University of Technology,Nanjing 211816,China)

机构地区：[1]南京工业大学机械与动力工程学院,南京211816

出　　处：《新能源进展》2023年第5期411-416,共6页Advances in New and Renewable Energy

基　　金：江苏省自然科学基金青年基金项目(BK20200686)。

摘　　要：为了确保“双碳”目标的实现,需要建立一个绿色低碳的循环发展体系,以提高能源利用效率。在构建新的能源体系过程中,寻找新材料和开发新的节能技术刻不容缓。泡沫金属由于其高效的传热性能与独特的传热机理,作为新型紧凑式传热表面引起了众多学者的关注。以孔隙率为97%,孔密度为10 PPI、20 PPI、40 PPI和60 PPI的泡沫铜为实验材料,研究泡沫金属内空气流动与换热特性。结果表明,40 PPI和60 PPI泡沫铜具有更高的传热系数,同时产生较大的压差,10 PPI泡沫铜的综合传热性能更好,低孔密度泡沫金属的强化传热特性应深入研究。依据实验结果,基于Fluent多孔介质模型理论,计算得到不同孔密度泡沫金属的黏性与惯性阻力系数,拟合得到对流换热系数与空气流速之间的函数关系式。To ensure the achievement of the carbon peaking and carbon neutrality goals,it is necessary to establish a green and low-carbon circular development system to improve energy utilization efficiency.In the process of building a new energy system,it is urgent to find new materials and develop new energy-saving technologies.Foam metal has attracted many scholars'attention as a new compact heat transfer surface due to its efficient heat transfer performance and unique heat transfer mechanism.The air flow and heat transfer characteristics in foam metal were studied using copper with 97%porosity and 10 PPI,20 PPI,40 PPI,and 60 PPI pore density as experimental materials.The results showed that 40 PPI and 60 PPI foam copper had higher heat transfer coefficients and higher pressure drop.The comprehensive heat transfer performance of 10 PPI foam copper was better,and the enhanced heat transfer characteristics of foam metal with low pore density should be further studied.According to the experimental results,the viscous and inertial drag coefficients of metal foam with different pore densities were calculated based on the porous medium model theory of Fluent,and the functional relationship between convective heat transfer coefficient and air velocity was obtained by fitting.

关 键 词：泡沫金属 对流换热 多孔介质 阻力系数 

分 类 号：TK172[动力工程及工程热物理—热能工程]