Date of Original Version

1991

Type

Technical Report

Rights Management

All Rights Reserved

Abstract or Description

Abstract: "Grooved-channel geometries are formed when electronic components are directly mounted to a substrate. Some grooved-channel geometries have been found to excite and sustain the normally damped instabilities present in Poiseuille flows at lower Reynolds numbers than indicated by linear stability analysis. The resulting self-sustained oscillatory flows improve mixing and thereby enhance convective heat dissipation. Numerical simulations of the flow field and heat transfer characteristics of oscillatory and non-oscillatory flows for five grooved- channel and one suspended block geometry are presented. The extent of heat transfer enhancement is gauged through direct comparison to results corresponding to the steady-flow regime.Local heat transfer coefficients are determined and used to calculate the temperature distribution within a surface-mounted package. Furthermore, the importance of using locally defined heat transfer coefficients instead of spatially-averaged coefficients for thermal design and analysis is discussed."

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