An investigation into the effect of regular polygonal cross-sections on thethermal performance of microchannel heat sinks
Microchannel heat sinks can be constructed from the channels with various geometries in cross-section. Their shape and size may have considerable effects on the hydraulic and thermal performance of a heat sink. In this paper, the fluid flow and heat transfer of a microchannel, with water as the coolant fluid, have been evaluated numerically. The wall of the microchannel heat sink is composed of a wafer of silicon. The numerical simulation was implemented to a unit cell of the heat sink with a fixed volume. Different regular polygons with 3-∞ sides were considered as the cross-section of the unit cell channel. The numerical simulation for geometrical evaluation was conducted in a laminar flow range, constant pressure drop, constant solid volume fraction and constant fluid volume fraction using OpenFoam as an opensource CFD code. The geometrical characteristics of the cross-section were optimized to reach the optimal cross-sectional area of the unit cell of the microchannel heat sink, which in turn minimized the overall highest temperature and maximized overall global thermal conduction. It was found that the circular microchannel heat sink has the best performance among all the shapes with consideration of constant cross-section area and pressure drop. In addition, the effect of pressure drop in the heat sink was also investigated, as the result of which the increasing pressure drop reduced the difference between maximum temperatures for different cross-section shapes. The position of the flow passage in the microchannel was examined to find out how it could affect the thermal performance of the heat sink with
regular polygonal cross-sections.
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Copyright (c) 2019 Salman Soltanian, Fatemeh Almasi, Mohammad Reza Shetab Bushehri
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