Heat Transfer Performance of Water Flow in Porous Copper Pipes Fabricated by Explosive Welding Technique

Abstract

This paper describes heat transfer characteristics of a water flow in an explosive compression porous copper pipes. Experiments with a double-pipe heat exchanger are conducted with four porous copper pipes having different porosities and pore diameters to evaluate the heat transfer performance in a water flow. The results show that the heat transfer coefficient is much higher than that of a circular pipe flow especially in the low flow velocity regime and is 2.5 times at the maximum. It is confirmed that the present porous copper pipes have an advantage below the pumping power of 10 W/m, though the pressure loss of the porous pipes increased up to 28 times compared to that of the circular pipe.