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| Influence of pore density and porosity on heat transfer performance of copper foam |
| LIU Han-qiang, ZHAO Peng, PU Yu-ping, SHEN Wei, ZHU Li-ran |
| Central Iron and Steel Research Institute, Beijing 100081, China |
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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 [Nu] of 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 [K2] decrease by about 80% and 50%, and the [Nu] increases by about 100% when pore density increases from 10 ppi to 45 ppi at the same porosity, while [K1] and [K2] decrease by about 30% and 20%, and[Nu]increases 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.
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Received: 11 September 2014
Published: 29 April 2015
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2015, Vol. 25 
