1992 Volume 25 Issue 1 Pages 39-43
Local controllability of jet impingement heat transfer was investigated by immersing an array of circular cylinders within a slot jet. Heat transfer on the central stagnation line was augmented most effectively due to the acceleration and surface-renewal effects when the cylinder array was placed from four to six cylinder diameters upstream of the heat transfer surface in a ‘passing’ arrangement. The maximal point of heat transfer was shifted, without attenuation, to half the cylinder pitch off the jet axis on both sides by a ‘blocking’ arrangement whereas the central stagnation-line heat transfer was suppressed very much due to the blocking effect. The mechanism for augmentation of the stagnation-line heat transfer was explained successfully by the surface-renewal model proposed.
