Heat Transfer and Fluid Flow Analysis of Spiral Microchannel Heat Sink - Softcover

Inhaltsangabe

The microchannel are used to augment the heat transfer rate especially for the cooling in electronic components. Today’s electronic components are required to perform tasks at a faster rate, and so high-powered integrated circuits have been produced in order to meet this need. These high-speed circuits are expected to generate heat fluxes that will cause the circuit to exceed its allowable temperature. In order to solve this problem, microchannel heat sink were introduced in 1981 by Tuckerman & Pease and have since been the study of many researchers in the field of fluid mechanics. The heat generated by the electronic component is transferred to the coolant by forced convention. The microchannel causes a decrease in the thickness of thermal boundary layer, which generates a decrease in the convective resistance to heat transfer, thus generating high cooling rates. To the best knowledge of the authors, not much work was done on Spiral type Microchannel Heat Sink. In the present work an aluminum piece of dimension 50mmx 50mm x 5mm with spiral microchannel is fabricated and heat transfer and fluid flow analysis will be performed. The liquid fluid is allowed to flow inside the grove and measurement is taken at the inlet and outlet of the plenum for pressure drop, temperature variation and heat transfer rate. In present work the research is studied both analytically and experimentally. In analytical work the computational study is carried out with the specific boundary conditions. In inner boundary condition the fluid is pass through the microchannel with the mass flow rate of 1lite per hour (LPH) and at outer boundary condition the environmental pressure of 101325Pa is provided. The heat source of 25Watt is given at the bottom surface of Spiral Microchannel. The wattage variation is as 25W, 35W, 45W, 55W, 65W keeping the flow rate constant i.e 1LPH. Similar wattage variation is performed at every flow rate 1.5LPH, 2LPH, 2.5LPH, 3LPH. This is done for two different cases, Case 1: Entry of fluid at Inner Spiral Eye (EISE) and for Case 2: Entry of fluid at Outer Spiral Eye (EOSE) in order to conclude which case gives the best result. This computational study of result is compared with the experimental result in order to verify the research. In this research the best result is obtained in Case 1 i.e EISE. It is due to the fact that the pressure drop obtain in Case 1 is less than the Case 2 which depicts that the rate of heat transfer is more in case of EISE.

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