Flow Mode-transition Of Natural Convection
Inside Inclined Complex Enclosures
Author(s)
H. Wang & M. S. Hamed
Abstract
Steady, two-dimensional natural convection in an air-filled, inclined, curved
bottom enclosure heated from below and cooled from above has been
investigated numerically. A general quadratic equation has been used to
represent curvature of the bottom wall considering various maximum middle
heights. The effect of geometric shape of the curved bottom on mode-transition
and the hysteresis phenomenon (multi-steady solutions) associated with thermal
convection inside inclined enclosures has been reported.
Simulations have been carried out for Rayleigh numbers, based on cavity
height, in the range between 103 and 104 and cavity aspect ratio equal to 4. The
hysteresis phenomenon has been investigated as angle of inclination was varied
from 0o to 90° and back to 0o. Results indicate that mode-transition and, hence,
rate of heat transfer of buoyancy driven flows is greatly dependent on the shape
of the bottom wall. Multi-cell flow patterns, normally observed in the case of
flat-bottom cavities, can be eliminated and thereby, flow mode-transitions
occurring due to change of the angle of inclination can be avoided. The existence
of multi-steady solutions also strongly depends on the curvature of the bottom
wall and could also be eliminated or controlled.
Findings of the present study are useful in the design of heat transfer systems
where sudden changes in the rate of heat transfer due to flow-mode transitions
and variations of effectiveness of heat transfer inside cavities due to the
hysteresis phenomenon can be eliminated or controlled in a certain desired way.
Keywords: natural convection, inclined cavities, complex enclosures, modetransition,
hysteresis phenomena.
Keywords
natural convection, inclined cavities, complex enclosures, modetransition,
hysteresis phenomena.
Related Book
Other papers in this volume
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