Experimental investigation on the thermal-hydraulic performance of channel with gradient metal foam baffles

Metal foam is a novel material recently utilized in baffles as an alternative to solid for reducing flow resistance. However, the metal are accompanied by low heat transfer efficiency. To overcome this issue, new design of copper has been suggested research, called having gradient pore density foam. The either increases or decreases towards wall. So, experimental tests were carried out square channel and heated uniformly at bottom wall test section. Its walls mounted fixed porosity 95%. Baffles alternately upon walls' top staggered mode. results determined various kinds (10 20) pores per inch (PPI), was with order decreasing (DPPI) 10/20 PPI increasing (IPPI) 20/10 window cut ratio 25% constant flux 4.4 kW/m2 . Reynolds number changed from 3.8x104 5.4x104 data conventional used compare influence type. obtained revealed enhancement thermohydraulic performance DPPI (10/20 PPI) higher than all models baffles.