The Thermal and Rewetting Behavior of Hot Moving Surface by Water Jet Impingement

Abstract The present paper reports thermal and rewetting behavior of moving surfaces with upward circular water jet impingement. A stainless-steel foil (SS-304) with 0.15 mm thickness, used as a test specimen and temperature is measured by infrared thermal imaging camera, for transient cooling conditions. The initial surface temperature of the test foil is kept at 500 ± 10 °C, and the distance between nozzle to plate is maintained at 6. During tests, Reynolds number was varied between 2500 and 10000, while the plate test specimen speed was varied within 0 and 40 mm/s. Except for the stagnation zone (x = 0), the local heat flux values are found to be higher for moving surfaces compared to stationary surfaces. The heat flux gradient in the axial direction is higher for the stationary plate and reduces with increase in the plate speed. Nondimensional rewetting velocity is found to increase, with an increase in plate speed and Reynold Number.