An efficient method for the geometric parameters optimization of double-layer micro-channel heat sink

In this study, thermal resistance of a double-layer micro-channel heat sink (DL-MCHS) with different ratio of upper and bottom channel heights in outlet (α=H_U/H_B) and the angle of channel inclination (θ), was investigated numerically. The advantage of DL-MCHS in reducing thermal resistance compared with single-layer micro-channel heat sink (SL-MCHS) was quantitatively demonstrated. It was confirmed that both α and θ have significant impacts on the heat transfer performance of DL-MCHS. Accordingly, response surface methodology as a time-efficient optimization method was employed to obtain the optimal geometry for DL-MCHS. It turned out that the optimized geometric parameters were α = 2 and θ = 6°. In this case, compared to SL-MCHS, the thermal resistance of DL-MCHS is reduced by 34.6%. Our work should be of practical value for the design of high efficiency micro heat sink with various geometric parameters.