Parametric optimization of stacked-plate jet-impingement microchannel heat sink

In this paper, a stacked-plate jet-impingement microchannel heat sink (SP-JIMC) is developed which can achieve a total heat transfer surface area over 407.36 cm² on a footprint area of 3 cm × 3 cm. There are 1350 micro-fins distributed equally on the heating surface, which constitute over 1400 micro-channels. According to the experimental results, when the micro-fin width and micro-channel width were both 0.5 mm, the channel height was 3.0 mm and the copperplate thickness was 0.3 mm, the lowest thermal resistance was 1.4 × 10^-5 m²⋅K/W at an inlet mass flux of 162.05 kg/m²⋅s. Heat transfer characteristics were analyzed on the micro-fin efficiency and local heat transfer coefficient. When the fin height was 1.5 mm, the fin efficiency reached the highest value of 81.3 %. The internal surface of SP-JIMC was categorized into four parts including the micro-fins, the impingement surface, the separator and the channel bottom, and the corresponding correlations of Nusselt number were proposed. Based on the correlations, parametric optimization was performed on the SP-JIMC with objective function of minimum thermal resistance. Compared with the original design, the thermal resistance could be reduced by 55.6 %, and the minimum value of 1.01 × 10^-5 m²⋅K/W can be achieved at a Reynolds number of 100 when W_fin = W_ch = δ_th = 0.2 mm, H₁ = 0.45 mm and H₂ = 0.05 mm.