Thermal radiation and the thermal management of micro-devices via gaseous flows
- Univ. of Alabama, Birmingham, AL (United States). Dept. of Materials and Mechanical Engineering
The impact of thermal radiation on heat and momentum transfer characteristics in gaseous micro-flows is explored. A model problem is formulated which incorporates a radiative source term in the energy equation and couples the momentum and energy equations through the use of Sutherland`s model for viscosity. The optically thin approximation is used to model the contribution of thermal radiation. Maxwell/Smoluchowski boundary conditions are applied at the solid-gas interfacial boundaries. Numerical results for flow fields with Knudsen numbers in the slip flow regime are presented. Comparisons are made between results with and without thermal radiation and with results from previously published analytical expressions. A parametric study is examined to determine the impact of various dimensionless quantities on flow field characteristics in microchannel flows. Skin friction coefficients and Stanton numbers are also presented and discussed. Conclusions as to the importance of thermal radiation in effectively predicting microflow behavior are drawn.
- Sponsoring Organization:
- Department of the Air Force, Washington, DC (United States); Alabama Space Grant Consortium, AL (United States)
- OSTI ID:
- 483912
- Report Number(s):
- CONF-961105--; ISBN 0-7918-1527-7
- Country of Publication:
- United States
- Language:
- English
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