t has been suggested that heat transfer from a surfacecan

Chapter 7, Problem 7.137

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t has been suggested that heat transfer from a surfacecan be augmented by wetting it with water. As a spe-cific example, consider a horizontal tube that isexposed to a transverse stream of dry air. You mayassume that the tube, which is maintained at a temper-ature Ts?T?, is completely wetted on the outsidewith a thin film of water. Derive an equation to deter-mine the extent of heat transfer enhancement due towetting. Evaluate the enhancement for V?10 m/s,D?10 mm, Ts?320 K, and T??300 K.

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