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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

HEAT TRANSFER ENHANCEMENT WITH A SELF-OSCILLATING JET IMPINGEMENT NOZZLE

Get access (open in a dialog) DOI: 10.1615/IHTC10.1000
pages 19-24

Resumo

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.