ISSN Online: 2377-424X
ISBN Print: 0-85295-345-3
International Heat Transfer Conference 10
HEAT TRANSFER ENHANCEMENT WITH A SELF-OSCILLATING JET IMPINGEMENT NOZZLE
Abstract
In line jets are used throughout industry for drying
and heat transfer. A simple modification to an in line jet
offers significant enhancement of its transport properties.
The addition of a collar to an in line jet exit introduces an acoustic standing wave and flow fluctuations. The new
oscillating jet when used for impingement surface transport
has been labeled the Self-Oscillating Jet Impingement Nozzle
(SOJIN). The objectives of the research were to characterize
the gains in heat transfer caused by utilizing the oscillating nozzle in contrast to a non-oscillating in line jet (ILJ). The research consisted of flow visualization, acoustic measurement, turbulence and flow measurement, and heat transfer testing. Parameters varied included nozzle length, flow rate, collar extension length, and nozzle-to-surface spacing. Significant increases in heat transfer were obtained and optimal nozzle operating conditions were identified. Explanations for increased heat transfer in the near stagnation point area are presented and discussed.