Enhanced flow boiling in a microchannel with integration of nanowires

Convective heat transfer performance of a micro-channel with copper nanowires (CuNWs) coatings has been investigated experimentally. Experimental studies were carried out on a bottom surface heated single micro-channel of 672 mu m hydraulic diameter using de-ionized (DI) water as coolant. Nanowires were directly grown on the bottom surface of the micro-channel using electrochemical deposition technique. Both single-phase and two-phase convective heat transfer experiments were performed at different mass flux and different degree of sub-cooling. The results from microchannel with bare surface are used as the baseline data. CuNWs coatings have been found to enhance single-phase heat transfer rate by up to similar to 25%, whereas in the flow boiling regime, the enhancement was up to similar to 56% with a pressure drop increase by similar to 20% in the single-phase regime. The obvious change of pressure drop in the fully developed boiling regime was not observed. (C) 2011 Elsevier Ltd. All rights reserved.