Thermo Fluid Stress Deformation Analysis of Two Layer Microchannels for Cooling Chips With Hot Spots

Abstract

Twolayer single phase flow microchannels were studied for cooling of electronic chips with a hot spot. A chip with 2.45 أ— 2.45 mm footprint and a hot spot of 0.5 أ— 0.5 mm in its center was studied in this research. Two different cases were simulated in which heat fluxes of 1500 W cm−2 and 2000 W cm−2 were applied at the hot spot. Heat flux of 1000 W cm−2 was applied on the rest of the chip. Each microchannel layer had 20 channels with an aspect ratio of 4:1. Direction of the second microchannel layer was rotated 90 deg with respect to the first layer. Fully threedimensional (3D) conjugate heat transfer analysis was performed to study the heat removal capacity of the proposed twolayer microchannel cooling design for high heat flux chips. In the next step, a linear stress analysis was performed to investigate the effects of thermal stresses applied to the microchannel cooling design due to variations of temperature field. Results showed that twolayer microchannel configuration was capable of removing heat from high heat flux chips with a hot spot.