EXPERIMENTAL-STUDY ON MASS HEAT-TRANSFER OF CIRCULAR JET IMPINGEMENT IN CUBICAL CAVITIES

Heat/mass transfer characteristics of a circular jet impingement in cu bical cavity with flat or curved bottom surface are investigated exper imentally using naphthalene sublimation technique. The effects of the distance between jet exit and bottom surface (H) and jet Reynolds numb er are parametrically studied. The jet Reynolds number varied from 7 x 10(3) to 1.1 x 10(5), and the ratio of HID (D-jet delivery nozzle dia meter) varied from 0.5 to 4.0. The surface averaged Sherwood numbers f or the bottom and lateral walls are correlated with jet exit Reynolds number by a power law equation. In the parameter range tested, the ave raged Sherwood number of the bottom surface is always lower than that of the lateral walls.