Journal
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
Volume 49, Issue 7, Pages 1247-1252Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2010.01.020
Keywords
Pulsed impinging jet; Intermittent pulsation; Convective heat transfer; Nusselt number
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Funding
- National Natural Science Foundation of China [10947153, 10802083]
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A numerical study was carried out of heat transfer under a pulsating turbulent slot impinging jet. The jet velocity was varied in an intermittent (on off) fashion. The effects of the time-mean jet Reynolds number, temperature difference between the jet flow and the impinging surface, nozzle-to-target distance as well as the frequency on heat and mass transfer were examined. The numerical results indicate significant heat transfer enhancement due to intermittent pulsation of the jet flow over a wide range of conditions for both cooling and heating cases. Simulations of the flow and temperature fields show that the instantaneous heat transfer rate on the target surface is highly dependent on the hydrodynamic and thermal boundary layer development with time. (C) 2010 Elsevier Masson SAS. All rights reserved.
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