Abstract
A new microchannel heat sink (MCHS) design comprising of secondary channels which connect neighboring primary channels are numerically analyzed to study their thermo-hydraulic characteristics. The inclusion of secondary channels in the continuous walls results in disturbance of thermal and hydrodynamic boundary layers which leads to drop in boundary layer thickness. Number of such secondary channel on either side of main channel will cause the flow to be continuously in developing state. The new MCHS are tested for heat flux range of 65 Watt per sq.cm to 200 Watt per sq.cm and cooled by water flowing at Reynolds number ranging from 650 to 1300. Compared to conventional MCHS, the thermal performance of new MCHS is higher but at the cost of pressure drop. The overall enhancement factor of the new design which is a function of Nusselt number and pressure drop of enhanced MCHS and conventional MCHS is 1.4 to 1.85.
Highlights
The development of Micro-fabrication technologies has resulted in very small and compact electronic devices which created a requirement of removing large quantity of heat generated by such electronic devices from the small space
Kuppuswamy et al [12] introduced secondary flows by having slanted passages having alternate directions in the wall separating the neighboring channels. They reported that the overall performance of enhanced microchannel improved by 146% and thermal resistance decreased by 77% and was accompanied by 6% pressure drop compared to conventional microchannel
The simulation results of conventional microchannel heat sink (MCHS) are compared with the theoretical values of pressure drop and fluid temperature difference at inlet and outlet sections
Summary
The development of Micro-fabrication technologies has resulted in very small and compact electronic devices which created a requirement of removing large quantity of heat generated by such electronic devices from the small space. Kuppuswamy et al [12] introduced secondary flows by having slanted passages having alternate directions in the wall separating the neighboring channels They reported that the overall performance of enhanced microchannel improved by 146% and thermal resistance decreased by 77% and was accompanied by 6% pressure drop compared to conventional microchannel. The continuous wall of primary channel is broken by the oblique channel which results in breaking of the thermal and hydrodynamic boundary layer, and increase in fluid mixing They reported that the average Nusselt number of such fins increased by 103%. Belhadj et al [17] employed cylindrical grooves and triangular cavities to created periodic expansion constriction cross section and studied its effect on thermo-hydraulic performance They concluded that the Nusselt number maximum increased by 36% whereas the pressure drop increased by 44 %.
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