HEAT TRANSFER OF JET IMPINGING ON A V-SHAPE INVERSE WEDGE

Abstract

The local heat transfer coefficients of a V-shape inverse wedge were experimentally investigated for an impinging jet, as a model of a system heating a polyethylene laminated paper with hot air jet and cooling to make it adhere by a cold roller. A clear peak of heat transfer coefficient was found at a position downwards along the wall for small wedge angle (θ<90°), and the peak position shifted downwards for smaller angles. The peak values of heat transfer coefficients were of the same order of magnitude for the angles and for a given distance of nozzle. The investigated peak values of heat transfer coefficients amounted to about 75 % of those in the stagnant region.