Flow and thermal analysis of hybrid mini-channel and slot jet array heat sink

In this paper, experimental tests and numerical studies were performed for better understanding the flow and heat transfer characteristics of the hybrid mini-channel and slot jet array heat sink. The average heat transfer coefficients were experimentally obtained and compared with independent mini-channel heat sink and slot jet array heat sink with a dimension of 10 mm x 10 mm at a flow rate from 0.1 L/min to 1.2 L/min, heat flux of 35.74 W/cm(2) and 62.22 W/cm(2). The results showed that the hybrid scheme has a better heat transfer performance than other two heat sinks at the same flow rate. Numerical simulations were conducted to further analyze thermal-hydraulic performance of the hybrid heat sink at an inlet Reynolds from 230 to 2760. Compared with k-epsilon models, numerical results with transition SST flow model match better with the experimental results. According to the numerical results, we found vortexes in the channel of the hybrid heat sink and these vortexes are beneficial to the heat transfer. The influence of geometries on the overall thermal resistance and total pressure drop were discussed using numerical simulations. The results demonstrated that the base thickness, channel height, side wall to channel width ratio and channel number of the hybrid heat sink all have significant effect on the cooling performance and thermal resistance and pressure drop can be reduced obviously via geometry optimization.