Free Convective Transition of Intermediate Prandtl-Number Fluids in a Wide-Gap Horizontal Annulus

- Journal title : Transactions of the Korean Society of Mechanical Engineers B
- Volume 24, Issue 2, 2000, pp.169-176
- Publisher : The Korean Society of Mechanical Engineers
- DOI : 10.22634/KSME-B.2000.24.2.169

Title & Authors

Free Convective Transition of Intermediate Prandtl-Number Fluids in a Wide-Gap Horizontal Annulus

Yoo, Joo-Sik;

Yoo, Joo-Sik;

Abstract

Natural convection in a wide-gap horizontal annulus is considered, and the transition of flows and the bifurcation phenomenon are investigated for the fluids with Pr=0.2 and 0.3. At Pr=0.2, a bicellular flow pattern is observed at high Rayleigh number, and the solution is unique. At Pr=0.3, both the steady unicellular and bicellular flows exist above a certain critical Rayleigh number. For the fluids of Pr=0.2, the bicellular flow can be obtained by the impulsive heating of the inner cylinder, but it is not obtained from the zero initial condition for Pr=0.3. Hysteresis phenomena have not been observed. A transition from a bicellular flow to a unicellular flow occurs for Pr=0.3.

Keywords

Natural Convection;Transition of Flows;Unicellular Flow;Bicellular Flow;Dual Solutions;

Language

Korean

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