TED-AJ03-187 TURBULENT HEAT TRANSFER IN A SYMMETRIC EXPANSION PLANE CHANNEL

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The flow in a symmetric expansion plane channel is well known to deflect to one side of channel even at low Reynolds number due to the Coanda effect. Details of flow structure have been investigated by many authors. However, there have been only a few works of heat transfer. In the present paper, experimental results of turbulent heat transfer in the separated and reattached flow in a symmetric expansion plane channel are presented. Experiments were conducted using a low speed open circuit wind tunnel. The step H is 20mm high and 200mm wide, and an expansion ratio 2.0. Reynolds number based on the uniform flow velocity at step and H was varied from 5000 to 35000.[figure] The mean and turbulent fluctuating velocities were measured mainly using tow types of split film probe and a cold single wire probe was used for measuring the mean and turbulent fluctuating temperatures. It is found that the local Nusselt number profile is considerably different on the upper and lower walls due to the Coanda effect. Empirical formulae of the maximum Nusselt number in the reattachment region are proposed both for the upper and lower walls, and their two formulae are well correlated with the previous general formula proposed by Ota et al. The location of maximum Nusselt number is found to be very close to the flow reattachment point. Details of the velocity and temperature fields are clarified and their correlations with the heat transfer characteristics described above are investigated. Further, the wavelet transformation methodology was employed to study the instantaneous flow and temperature behaviors, as exhibiting its usefulness in the study of the present complicated flow and temperature fields.[figure]
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TED-AJ03-187 TURBULENT HEAT TRANSFER IN A SYMMETRIC EXPANSION PLANE CHANNEL

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