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13.8mm,分别填充5PPI/95%孔隙率和10PPI/95%孔隙率的泡沫铜的圆管。实验工况涵盖:蒸发压力995kPa;质流密度30～90kg.m-2.s-1;热通量5.9～16.5kW.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90kg.m-2.s-1时,内嵌10PPI泡沫金属的圆管中的压降梯度达56kPa.m-1;泡沫金属PPI越大,压降增加越多,相同工况下内嵌10PPI泡沫金属圆管中制冷剂流动沸腾的压降是内嵌5PPI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13.8mm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。
The two-phase pressure drop characteristics of R410Aflow boiling inside tubes filled with metal foams were investigated experimentally.The test sections are two tubes of 13.8mm inner diameter filled with 5 PPI/95% porosity and 10 PPI/95% porosity metal foams separately.Experimental conditions include saturation pressure of 995kPa,mass flux from 30to 90kg.m-2.s-1,heat flux from 5.9to 16.5 kW.m-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.m-1 at vapor quality of 0.775and mass flux of 90kg.m-2.s-1.The pressure drop increases with the value of PPI,and the pressure drop with 10PPI metal foams can be as much as 1.2times that with 5 PPI metal foams under the same working condition.A pressure drop correlation for the 13.8mm 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%.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2012年第11期3428-3433,共6页
CIESC Journal
基金
国家自然科学基金项目(50906048)~~
