The ra-pr domain of laminar natural convection in an enclosure heated from the side1

The phenomenon of natural convection in a square enclosure heated and cooled in the horizontal direction was investigated numerically in the Prandtl number range 0.01-10 and the Rayleigh number range 102-1011. The numerical method retied on the full governing equations for time-dependent flows. The study focused on the detection of inertia- sustained fluctuations in the flow field and on the highest Rayleigh number where steady- state laminar flows are possible. It was found that the highest Rayleigh number decreases dramatically as the Prandtl number decreases. This finding agrees qualitatively with experimental observations of transition to turbulent natural convection and with the “local Reynolds number” criterion of transition to turbulence recommended by the buckling theory of turbulent flow. Copyright © 1991 by Hemisphere Publishing Corporation.

Duke Scholars

Author Adrian Bejan Thomas Lord Department of Mechanical Engineering and Materia ...