LAUSR

Abstract An offset-strip pin miniature heat sink (OSPMHS) is experimentally analyzed in order to find the effects of design parameters, including strip thickness (t = 1, 2, and 3 mm), strip length (l = 5, 10, and 15 mm), strip transversal pitch (pt = 1, 2, and 3 mm), and strip longitudinal pitch (pl = 5, 10, and 15 mm). The Al2O3/water nanofluids in weight concentrations of 0.1% and 0.3% are tested and their results are compared with water as the base fluid. A heat transfer enhancement is observed for the OSPMHSs at the lower values of the studied design parameters, i.e. t = 1 mm, l = 5 mm, pt = 1 mm, and pl = 5 mm. Also, noticeable values for the heat transfer rate to pumping power ratio are obtained for the OSPMHSs with thinner and longer strips with higher transversal and longitudinal pitches. Based on experimental data for the studied ranges, the lower values of the convective thermal resistance and pumping power are obtained for the OSPMHS with t = 1 mm, l = 10 mm, pt = 2 mm, and pl = 10 mm; the lowest convective thermal resistance of 0.03 °C/W is obtained at the pumping power of 0.2 W. Finally, it is detected that the cooling performance of a nanofluid-cooled OSPMHS is greater than a base fluid-cooled OSPMHS.