INFLUENCE OF EXIT ANGLE ON RADIAL JET REATTACHMENT AND HEAT-TRANSFER

Flowfield and heat transfer have been computed for impinging laminar, semienclosed axial, and vectored radial jets. A finite volume computat ional scheme based on SIMPLEC has been developed to solve the Navier-S tokes and energy equations, The present scheme can handle backflow at the exit of the computational domain. The results show that the axial jets produce larger heat transfer on a small area, and the radial jets produce moderately large transfer on larger areas. Through the vector ing of the radial jets, the area of high transfer can be selected as w anted, Axial jets always give larger peak heat transfer on the point o f impingement than the radial jet on the impingement circle. This peak value for radial jet increases with the increasing angle of the jet i nclination, At some critical value of the jet inclination (60 deg for the present geometry and the Reynolds number) the total heat transfer on the impingement surface can be larger for the radial jet than for t he axial jet. Radial jets with an angle of inclination of 0 deg or les s can produce a suction force on the impingement surface. Such jets ca n be used for transport of the product surfaces and heat or mass trans fer on the surface at the same time.