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RESEARCH PAPERS

# Experimental Measurements of Heat Transfer Coefficient in a Partially/Fully Opened Tilted Cavity

[+] Author and Article Information
W. Chakroun, M. M. Elsayed, S. F. Al-Fahed

Mechanical and Industrial Engineering Department, Kuwait University, P. O. Box 5969, Safat 13060, Kuwait

J. Sol. Energy Eng 119(4), 298-303 (Nov 01, 1997) (6 pages) doi:10.1115/1.2888036 History: Received September 01, 1995; Revised May 01, 1997; Online February 14, 2008

## Abstract

An experimental investigation was carried out to determine the heat transfer coefficient from a rectangular tilted cavity to the ambient due to the buoyancy driven flow in the cavity. The cavity is partially or fully open from one side. All the walls of the cavity are adiabatic except the wall facing the cavity opening which is heated at a constant heat flux. Air was used as the cavity fluid and the experiments were carried out at a flux Grashof number of 5.5 × 108 . The tilt angle of the cavity, measured from the vertical direction, was changed between −90 deg to +90 deg in 15 deg increments. Also, geometries of aspect ratio (height-to-width of cavity) of 1.0, 0.5, and 0.25 and of opening ratio (opening height to cavity height) of 1.0, 0.5, and 0.25 were considered in the study. The results are presented in terms of the average Nusselt number for different values of the above experimental parameters. Conclusions are derived for the effect of changing the tilt angle, the aspect ratio, or the opening ratio of the cavity on the average heat transfer coefficient between the cavity and the ambient air.

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