A Comparative Study on Saturated Boiling Heat Transfer Characteristics in Heat Sinks with Different Rib Shapes

Faced with the growth trend of high-power electronic devices and the accompanying requirements for efficient heat dissipation, boiling heat transfer technology has enormous development potential in existing cooling methods. In order to optimize the structures of ribbed channels and further improve the comprehensive heat transfer performance, the saturated boiling phenomena of fluorocarbon fluid in two-dimensional ribbed channel was investigated using the VOF (Volume of Fluid) model. The inlet velocity was
$1.0 \mathrm{m}\cdot \mathrm{s}^{-1}$
, and the range of heat flux was
$100\sim 500\text{kW}\cdot \mathrm{m}^{-2}$
. The results showed that the heat transfer of the channel with square pin fins is better under medium and high heat fluxes, and its average temperature maximally decreased by 6.90K. The pressure drop of the pentagonal ribbed channel was the largest, as well as that of the octagonal ribbed channel is the smallest, which was reduced by 16% ∼ 19% comparing with the former. The comprehensive heat transfer capacity of each channel was weakened with the increase of heat flux, but the octagonal ribbed channel always maintained the largest heat transfer factor by virtue of the minimum pressure drop, up by 25%. The research results can provide guidance for the cooling design of electronic devices.