Journal of Heat Transfer

Volume: Page/CID:

Initial Buoyancy Reduction in Exhausting Smoke With Solar Chimney Design
A possible problem in using solar chimney as a natural smoke exhaust system will be identified in this paper. Smoke generated in a fire might not be removed effectively if the glazing walls are heated...

Contributions of Inter- and Intraband Excitations to Electron Heat Capacity and Electron-Phonon Coupling in Noble Metals
This work examines the effects of photonically induced interband excitations from the d-band to states at the Fermi energy on thermophysical properties in noble metals. The change in the electron popu...

J. Heat Transfer / Volume 132 / Issue 1 / Technical Briefs

Buoyant Convection in Superposed Metal Foam and Water Layers

J. Heat Transfer -- January 2010 -- Volume 132, Issue 1, 014503 (4 pages)
doi:10.1115/1.3194767

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ABSTRACT

REFERENCES (12)

Author(s):
V. Kathare, F. A. Kulacki, Fellow ASME; and Jane H. Davidson, Fellow ASME
Department of Mechanical Engineering, 111 Church Street Southeast, University of Minnesota, Minneapolis, MN 55455

Heattransfer measurements for natural convection in superposed metal foam andwater layers are reported. Two systems heated at the lowerboundary are considered: a water-filled cavity with a foam layeron the heated surface and a water-filled cavity with foamlayers on the upper and lower surfaces. The present experimentsuse open cell copper foams with a nominal porosity of92%, and the relative thicknesses of the water and foamlayers are varied. Steady state Nusselt numbers show that thepresence of foam on the boundaries enhances overall heat transfercoefficients over that for the water-only layer. Enhancement of overallNusselt numbers varies from 12% to 60% depending on Rayleighnumber. Sublayer configurations with foam on both heat transfer surfacesare more effective for enhancement than a configuration with foamonly on the heated surface.