Journal
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
Volume 101, Issue 2, Pages 1083-1094Publisher
WILEY
DOI: 10.1002/cjce.24378
Keywords
heat transfer; hierarchical honeycomb rib; microchannel; porous media; pressure drop
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This study investigates the thermal and hydraulic characteristics of microchannels with different shapes of ribs through numerical simulation. The results show that different shapes of ribs can enhance heat transfer, and microchannels with hierarchical honeycomb ribs exhibit the highest heat transfer capability.
Microchannel cooling technology has been proven to be extraordinarily efficient for the removal of heat flux in electronic devices. Here, we numerically investigate the thermal and hydraulic characteristics of microchannels with different shapes of ribs, namely, circular ribs, square ribs, regular ribs, and hierarchical honeycomb ribs. Those ribs are composed of solid and porous media. Results indicate that heat transfer can be promoted by adding different shapes of ribs. Especially, microchannels with hierarchical honeycomb ribs possess the greatest heat transfer capability. Pressure drop (Delta p) and friction factor (f) display the largest values when microchannel ribs are hierarchical honeycomb and solid, whereas Delta p of the microchannel with hierarchical honeycomb porous ribs dramatically decreases, which achieves an 81.1%-81.7% reduction. Results of j/f show that the microchannel with hierarchical honeycomb porous ribs presents the best comprehensive performance, which is ascribed to the superior heat transfer capability and the low Delta p induced by the ultra-hydrophobic effect.
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