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Experimental Heat Transfer
A Journal of Thermal Energy Generation, Transport, Storage, and Conversion
Volume 22, 2009 - Issue 1
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Original Articles

Effect of Sound Field on a Round Air Impingement Jet

A. Kanamori Graduate School of Engineering, Gifu University, Gifu, Japan
,
M. Hiwada Department of Mechanical and System Engineering, Gifu University, Gifu, Japan
,
J. Mimatsu Department of Mechanical and System Engineering, Gifu University, Gifu, Japan
&
K. Oyakawa Department of Mechanical and System Engineering, University of the Ryukyus, Okinawa, Japan
Pages 12-25 | Received 15 May 2008, Accepted 14 Aug 2008, Published online: 08 Jan 2009
 
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Abstract

The local heat transfer and static pressure on a heated plate is reported with an air jet produced by a circular nozzle under tone-excitation with a frequency range of fe = 0–300 Hz. The Reynolds numbers were (1.7 – 4.2) × 104, and the nozzle-to-plate spacings were L/d = 6, 8, and 10. For all spacing, the isopressure and Nusselt number contours changed a shape from a concentric circle to an elliptic or peanut shape and changed back to a concentric circle with an increase of the tone-exciting frequency. These phenomena might be attributed to the induced vorticities observed as a non circular orifice jet.

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