Conjugate heat transfer from three-dimensional heat sources in turbulent channel flow
- Clemson Univ., SC (United States)
The conjugate heat transfer from an array of protruding discrete heat sources was studied using a validated numerical simulation. The flow conditions were a rectangular channel with fully developed turbulent flows. Thermal, flow and geometrical parameters were varied for two conjugate conditions: (i) an isothermal substrate lower wall and (ii) a conducting substrate with adiabatic boundaries. Parameters included in the study are the solid-to-fluid thermal conductivity ratio, substrate thickness and the protrusion height. The magnitude of the heat flux conducted through the substrate is significantly affected by the substrate thickness and the substrate thermal boundary conditions. Protruding heat sources used in this study convect more than 40% more heat compared to flush mounted cases but there exists strong reversals in heat transfer (from the fluid-to-the substrate) downstream of protruding heat sources for high solid to fluid thermal conductivity ratios. An effective Biot number, which provides a measure of the relative magnitudes of the convection and conduction heat transfer, is found to be strongly correlated to the channel Reynolds number as well as the heat source geometry.
- OSTI ID:
- 449515
- Report Number(s):
- CONF-950828--; ISBN 0-7918-1711-3
- Country of Publication:
- United States
- Language:
- English
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