Date of Award

Summer 2004

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Advisor

Majdalani, Joseph C.

Second Advisor

Nibro, Nicholas J.

Third Advisor

Borg, John P.

Abstract

In this thesis, a proposed method of enhancing the heat transfer from an integrated chip and heat sink assembly is explored. Several designs of passive vortex generators are proposed and described. The governing equations for vortex generator performance are reviewed and expanded upon. The literature is reviewed and the equipment necessary for an experimental analysis is described. An extensive experimental regime consisting of fundamental fluid dynamics research to understand the behavior of vortices within a heat sink fin channel including flow visualization and constant temperature hot-wire anemometery is undertaken and the results reported. Experimentation to determine the optimal shape, angle of attack, channel height and aspect ratio was conducted and the results submitted. Additional performance parameters were developed and utilized with the results included. Heat transfer experiments were conducted employing the lessons learned in the fluid dynamics trials. The data is presented and the results reported. A limited numerical and mathematical analysis was undertaken to validate the experimental results. The results are reported relative to the wind tunnel velocity and include normalized results for temperature differences, dimensionless parameters, heat transfer, and beat transfer coefficients. Percentage change results are also submitted. The methods of manufacture and installation for retrofit to existing systems are discussed. The conclusions address the improvement in heat transfer, chip temperature, heat transfer coefficient and thermal resistance gained with this application of the vortex generator to the heat sink.

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