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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

NUMERICAL INVESTIGATION ON BIFURCATIVE NATURAL CONVECTION IN AN AIR-FILLED HORIZONTAL ANNULUS

Get access (open in a dialog) DOI: 10.1615/IHTC10.3620
pages 85-90

摘要

Steady-state two-dimensional natural convective heat transfer in horizontal cylindrical annuli was studied by solving the governing equations based on the primitive variables. Emphasis was put on the occurrence of the multiple solutions at a given set of parameter values, and on the determination of the bifurcation points at which those multiple solutions begin to branch out. Two families of convergent solutions were found for moderate values of outer-to-inner radius ratio and high Rayleigh numbers, depending on the initial guesses for the field variables. Particularly for a narrow annulus, tricellular solutions also were observed to exist, and only the multicellular solutions were viable as the Rayleigh number exceeded a certain critical value. It was also found that the numerical determination of the bifurcation points required very restrictive criteria for convergence.