填充泡沫铜圆管内R32单相流动换热  

Single-phase heat transfer characteristics of R32 flowing through metallic foam filled channel

作　　者：朴勇日 吴晓敏[1] 马强[1] 李通[1] 

机构地区：[1]清华大学热能工程系,热科学与动力工程教育部重点实验室,北京市C02资源利用与减排技术重点实验室,北京100084 [2]朝鲜金策工业综合大学,朝鲜平壤999093

出　　处：《化工学报》2017年第6期2275-2279,共5页CIESC Journal

摘　　要：在泡沫金属纤维两端布置电极,采用电加热方法,实验测量了填充泡沫金属的管内R32流体和泡沫金属纤维的温度分布,得到了泡沫纤维与流体之间的对流传热系数。实验条件为:实验段管径5 mm,泡沫铜孔隙率0.95,孔隙密度15、45 PPI,流体温度280~325 K,热通量1~18 k W·m^(-2),质量流速20~200 kg·m^(-2)·s^(-1)。实验及模拟结果表明:泡沫纤维与单相R32的对流传热系数随Re、泡沫铜的孔隙密度的增大而增大。基于流体外掠光滑圆管换热实验数据的Zukauskas经验关联式的预测值与泡沫金属纤维和R32流体之间的对流传热系数的实测值偏差为-35%^-67%,即该关联式不适用于泡沫金属纤维与流体之间的对流传热系数的预测。By electric heating method of metal foam, temperature distribution of R32 and porous fibre were measured and the heat transfer coefficients between them were obtained in metallic foam filled channels. The experiments were conducted for R32 in a metallic foam filled tube with an internal diameter of 5 mm, the 0.95 porosity and 15, 45 PPI pore densities, under the conditions of fluid temperature of 280-325 K, heat flux ranging of 1-18 kW·m^-2, and mass flux ranging of 20-200 kg·m^-2·s^-1. Following conclusions could be summarized from the results of the experiments. The heat transfer coefficients of R32 flowing through porous fibres increased with the increase of Re and pore densities. The deviation between predicted values of heat transfer coefficient based on conventional correlation and experimental data reached to -35%- -67%, that is, the conventional correlation is not suitable to predict the convective heat transfer between the porous fibre and the fluid.

关 键 词：泡沫金属 R32 传热系数 

分 类 号：TK1[动力工程及工程热物理—热能工程]