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首页> 外文期刊>Journal of heat transfer: Transactions of the ASME >Effect of aperture geometry on heat transfer in tilted partially open cavities
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Effect of aperture geometry on heat transfer in tilted partially open cavities

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Free convection from a square, tilted partially open cavity was investigated experimentally. The experiment was carried out to study the effect of the aperture geometry on the heat transfer between the cavity and the surrounding air. Fourdifferent geometrical arrangements for the opening were investigated: (1) high wall slit, (2) low wall slit, (3) centered wall slit, and (4) uniform wall slots. Each opening arrangement was studied at opening ratios (i.e., ratio of opening height tocavity height) of 0.25, 0.5, and 0.75. The average heat transfer coefficient between the cavity' and the surrounding air was estimated for each geometrical arrangement for tilt angles ranging from -90 deg to +90 deg with increments of 15 deg and at aconstant heat flux Grashof number of 5.5×10{sup}8, The results showed that for tilt angles between 90 and 75 deg, the heat transfer coefficient has a small value that is independent of the geometrical arrangement of the opening. The value of the heattransfer coefficient increases sharply with decreasing tilt angle until an angle value of zero degrees is reached. The increase in the heat transfer coefficient continues in the negative range of tilt angle but not in the same rate as in the positiverange of the tilt angle. The uniform slot arrangement gave in general higher heat transfer coefficient than the other three arrangements of the opening. Large differences in the heat transfer coefficient were observed between the high and the low wallslits where the high wall slit is found to transfer more heat to the surroundings than the low wall slit. Correlations were developed to predict the average Nusselt number of the cavity in terms of the opening ratio and the cavity tilt angle for cavitieswith high wall slit, low wall slit, centered wall slit, and the uniform wall slots.

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