【摘要】 采用超声波辅助电沉积工艺制备了9种不同孔结构的泡沫铜,研究了水工质、层流-紊流转捩状态下(0.4~1.3 m/s)泡沫铜的孔密度和孔隙率对换热性能的影响。结果表明:相同孔隙率,孔密度从10 ppi增大到45 ppi时,泡沫铜的黏性系数K1和惯性系数K2分别降低约80%和50%,努赛尔数Nu提高了约1.0倍;相同孔密度,孔隙率从96%降低到90%时,泡沫铜的K1和K2分别降低约30%和20%,Nu提高了约0.5倍;10 ppi孔密度、96%孔隙率的泡沫铜具有最优的综合性能。更多还原

【Abstract】 Copper foams with nine different cell structural parameters were prepared by ultrasonic assisted electrodeposition process. The viscosity coefficient K1, inertia coefficient K2 and nusselt number Nuof copper foams were tested using water as working fluid in laminar-turbulent transition region(0.4~1.3 m/s). The influence of pore density and porosity of copper foams on flow, convective heat transfer and overall performance was discussed. Results show that K1 and K2decrease by about 80% and 50%, and the Nuincreases by about 100% when pore density increases from 10 ppi to 45 ppi at the same porosity, while K1 and K2decrease by about 30% and 20%, and Nuincreases by about 50% when porosity decreases from 96% to 90% at the same pore density. From the view point of overall performance, copper foam with pore density of 10 ppi, 96% porosity is a clear optimum.更多还原