Hydrodynamic and thermal performance of in-line strip-fin manifold microchannel heat sink

In this work, an in-line strip-fin manifold microchannel heat sink is proposed to improve the hydro-dynamic and thermal performance of the conventional manifold microchannel. The hydrodynamic and thermal performance of varying strip-fin arrangements with approximately the same heat transfer area are numerically investigated. The results show that the in-line strip-fin manifold microchannel has lower pressure drop and better thermal performance than that of the conventional manifold microchannel at the same inlet mass flux. For varying strip-fin arrangements studied in this work, the pressure drop de-creases by 15% to 25 . 5% at the inlet mass fluxes between 600 kg/(m2s) and 1800 kg/(m2s), compared with the conventional manifold microchannel. The effective overall thermal resistance of the in-line strip -fin manifold microchannel heat sink reaches the minimum value at one specific strip-fin arrangement, which is characterized by the optimal longitudinal number of strip-fins NL,opt. A minimum effective over-all thermal resistance of 5 . 7 x 10 -6 m2K / W at an inlet mass flux of 1800 kg/(m2s) is achieved. The av-erage temperature of the optimal strip-fin arrangement is about 6 . 8 K lower than that of the conven-tional manifold microchannel, when the heat flux is 300 W/ cm2. Heat transfer correlation considering microchannel geometrical parameters is proposed, which can be used to predict the thermal performance of the in-line strip-fin manifold microchannel. Based on the correlation, the effect of the in-line strip-fin array on the thermal performance is qualitatively revealed by thermal resistance analysis.(c) 2023 Elsevier Ltd. All rights reserved.