Abstract: The two-phase pressure drop characteristics of R410A flow boiling inside tubes filled with metal foams were investigated experimentally.The test sections are two tubes of 13.8 mm inner diameter filled with 5 PPI/95% porosity and 10 PPI/95% porosity metal foams separately.Experimental conditions include saturation pressure of 995 kPa,mass flux from 30 to 90 kg穖^-2穝^-1,heat flux from 5.9 to 16.5 kW穖^-2,and inlet vapor quality from 0.175 to 0.775.The experimental results are as follows.Metal foams always increase the pressure drop of flow boiling,and the pressure drop reaches 56 kPa穖^-1 at vapor quality of 0.775 and mass flux of 90 kg穖^-2穝^-1. The pressure drop increases with the value of PPI,and the pressure drop with 10 PPI metal foams can be as much as 1.2 times that with 5 PPI metal foams under the same working condition.A pressure drop correlation for the 13.8 mm tube filled with metal foams was developed based on the experimental data,and 90% of the predicted results agree with the experimental data within a deviation of ?15%.

Key words: metal foam, R410A, flow boiling, pressure drop, correlation

摘要： 对填充泡沫金属的圆管中R410A流动沸腾的两相流压降特性进行了实验研究。实验对象为两根内径13.8 mm,分别填充5 PPI/95%孔隙率和10 PPI/95%孔隙率的泡沫铜的圆管。实验工况涵盖:蒸发压力995 kPa;质流密度30~90 kg·m^-2·s^-1;热通量5.9~16.5 kW·m^-2;入口干度0.175~0.775。实验结果表明:泡沫金属显著增加制冷剂流动沸腾的压降,在入口干度为0.775,质流密度为90 kg·m^-2·s^-1时,内嵌10 PPI 泡沫金属的圆管中的压降梯度达56 kPa·m^-1;泡沫金属PPI越大,压降增加越多,相同工况下内嵌10 PPI泡沫金属圆管中制冷剂流动沸腾的压降是内嵌5 PPI泡沫金属圆管中的压降的1.2倍左右。根据实验数据开发了适用于填充泡沫金属的内径13.8 mm圆管中的流动沸腾的压降关联式,结果表明90%的预测值与实验值的偏差在±15%以内。

关键词: 泡沫金属, R410A, 流动沸腾, 压降, 关联式