Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4995289 | International Journal of Thermal Sciences | 2017 | 12 Pages |
Abstract
An improved design of wavy microchannel heat sink with changing wavelength or/and amplitude along the flow direction is proposed. The thermal resistance R and the maximum bottom wall temperature difference ÎTb,max for the new design are compared with those for the straight and the original wavy design under a constant pumping power. The results show that the new design performance is enhanced significantly with lower R and smaller ÎTb,max when the wavelength of wavy units decreases or the amplitude increases. The enhancement becomes more remarkably when the absolute value of the wavelength difference Îλ or amplitude difference ÎA between two adjacent wavy units increases. The performance can be further improved by simultaneously increasing the absolute values of Îλ and ÎA. Moreover, as compared with the straight and the original wavy microchannel heat sink, the reductions in R and ÎTb,max for the new design is found more significant for the heat sink with a smaller channel aspect ratio. The heat transfer enhancement is attributed to the formation of vortices in the channel cross sections caused by the curved walls, which promotes the coolant mixing and enhances the convective heat transfer between coolant and channel walls.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Lin Lin, Jun Zhao, Gui Lu, Xiao-Dong Wang, Wei-Mon Yan,