Transport Phenomena Over a Moving Plate Due to Turbulent Slot Jets

ABSTRACT

Heat transfer characteristics of the turbulent slot jet impinging on a moving surface in the Reynolds number range up to 20,000 have been studied within a surface velocity up to about four times the jet velocity at the jet exit. The turbulent flow field was resolved using the realizable k−ε model due to Shi et al. (1995) after rigorously establishing the adequacy of the model by comparison with large-eddy simulation data. A periodic element from a jet-bank configuration was chosen in the direction of the surface movement. The distribution of heat transfer on impinging surface is found to be significantly affected by the plate motion. It is observed that the distribution curve of Nusselt number resembling an inclined-S flattens in the direction of the surface movement with increasing surface motion up to a certain level of surface velocity and the average heat transfer also reduces. When the surface motion crosses this level, the net heat transfer starts increasing. The amount of heat transfer was found to be linked with the level of turbulent kinetic energy near the impingement region. The threshold surface velocity at which the heat transfer reaches the value corresponding to the fixed surface value decreases with increasing Reynolds number.

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