ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
HEAT TRANSFER FROM A TURBULENT, SWIRLING, IMPINGING JET
Abstract
This paper presents mass and heat transfer
rates associated with orthogonal impingement of
single, swirling, air jets onto flat plates. Mass
transfer data were determined using a thin-film
naphthalene sublimation technique and the Chilton-Colburn
analogy was employed to infer the corresponding
heat transfer coefficients. The swirl
number was varied from 0 to 0.48 and the nozzle-to-plate
separations ranged from 2 to 12 jet diameters.
Jet Reynolds numbers of 32,000 and 60,000 (based on
the mean nozzle exit velocity in the non-swirling
case) were also studied. The application of swirl
was found to significantly reduce the heat transfer
rates. The average Nusselt numbers, for particular
impingement areas, were correlated by means of a
simple power-law dependence on the swirl and
Reynolds numbers and also on the nozzle-to-plate
separation.