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http://dx.doi.org/10.6112/kscfe.2017.22.1.110

TRIPLE SOLUTIONS IN NATURAL CONVECTION OF A FLUID IN A HORIZONTAL ANNULUS WITH CONSTANT TEMPERATURE WALLS  

Yoo, Joo-Sik (Dept. of Mechanical Engineering Education, Andong Nat'l Univ.)
Publication Information
Journal of computational fluids engineering / v.22, no.1, 2017 , pp. 110-115 More about this Journal
Abstract
Natural convection of a fluid with the Prandtl number of 7(water) in a horizontal annulus with constant temperature walls is numerically investigated. The inner cylinder is hotter than the outer cylinder. The flows are classified by the number of eddies in a half annulus. It is found that dual or triple solutions exists above a critical Rayleigh number for an annulus with a aspect ratio $D_i/L=4$. Transitions of $3{\rightarrow}1$ and $2{\rightarrow}1$ eddy flow occur with decrease of Rayleigh number. However, reverse transitions of $1{\rightarrow}3$ and $1{\rightarrow}2$ eddy flow do not occur with increase of Rayleigh number, and no hysteresis phenomenon is observed. In the regime of triple solutions, the 3 eddy flow has the largest mean Nusselt number value and the 1 eddy flow has the smallest value.
Keywords
Natural Convection; Horizontal Annulus; Constant Temperature; Triple Solutions;
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Times Cited By KSCI : 1  (Citation Analysis)
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