Forced Convection Heat Transfer from an Inner Surface of a Two-Dimensional Rectangular Cavity

이차원 사각형 공동 내부에서의 강제 대류 열전달

  • Seo, T.B. (Department of Mechanical Engineering, Inha University) ;
  • Han, K.Y. (Department of Chemical Engineering, Sungkyunkwan University) ;
  • Kange, Y.H. (Korea Institute of Energy Research)
  • 서태범 (인하대학교 기계공학과) ;
  • 한귀영 (성균관대학교 화학공학과) ;
  • 강용혁 (한국에너지기술연구원, 고온태양열 연구팀)
  • Published : 2002.12.31

Abstract

In order to investigate forced convection heat transfer due to the wind from the inner surface of a cavity receiver for a parabolic dish type solar energy collecting system, a two-dimensional rectangular cavity receiver is prepared and installed in a wind tunnel. The convection heat transfer coefficient of the inner surface of the receiver is dependent on the direction and the velocity of the wind. The attack angle of the cavity and the air velocity in the tunnel are controlled in a wide range so that the effects of the attack angle and the wind velocity on the heat transfer coefficient can be studied. The skirt is installed at the aperture of the cavity in order to reduce convective heat loss. The effects of the length and the installation angle of the skirt on convection heat transfer of the cavity are tested. It is found that convection heat loss can be significantly reduced by installing the skirt. Also, it is known that heat transfer from the cavity can be minimized if the angle of the skirt is $90^{\circ}$ to the outer surface of the cavity.

Keywords

References

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