대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제25권6호
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  • Pages.804-810
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  • 2001
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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수평 원주형 환형 내에서의 자연 대류 유동의 천이: Pr=0.2

Transition of Natural Convective Flows in a Horizontal Cylindrical Annulus: Pr=0.2

  • 발행 : 2001.06.01
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초록

Transition of flows in natural convection in a horizontal cylindrical annulus is investigated for the fluid with Pr=0.2. The unsteady streamfunction-vorticity equation is solved with finite difference method. As Rayleigh number is increased, the steady crescent-shaped eddy flow bifurcates to a time-periodic flow with like-rotating eddies. After the first Hopf bifurcation, however, a reverse transition from oscillatory to a steady flow occurs by the flow pattern variation. Hysteresis phenomenon occurs between the solution branches of up-scan and down-scan stages, and dual solutions with one steady and one oscillatory flow are found. Overall Nusselt of the flows at the flows at the down-scan stage is greater than that at the up-scan stage.

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참고문헌

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