Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Natural Convection of Air in a Horizontal Annulus with the Inner Cylinder Cooled by Constant Heat Flux

일정 열 유속으로 냉각되는 안쪽 실린더를 갖는 수평 환형 공간에서의 공기의 자연 대류

  • 유주식 (안동대학교 기계공학교육과) ;
  • 엄용균 (안동대학교 기계공학과) ;
  • 김용진 (한국기계연구원 열유체 환경연구부)
  • Published : 2000.08.01
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Abstract

Natural convection of air in a horizontal annulus with the inner cylinder cooled by the application of a constant heat flux and the isothermally heated outer cylinder is considered. The bifurcation phenomenon of flow patterns and the heat transfer characteristics are numerically investigated. The zero initial condition induces a unicellular flow in a half annulus. A bicellular flow consisting of two counter-rotating eddies in a half annulus can be obtained above a certain critical Rayleigh number. A transition from the bicellular to the unicellular flow occurs with a decrease in Rayleigh number. Hysteresis phenomena have not been observed. In the regime of dual flows, the overall Nusselt number of the bicellular flow is greater than that of the unicellular flow.

Keywords

References

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