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Impinging jet heat transfer improvement using acoustic forcing

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.1570
12 pages

Stephane Roux
LMT Cachan, ENS Cachan/CNRS/UPMC/PRES UniverSud Paris; and Laboratoire d'Etudes Aérodynamique (LEA), Université de Poitiers, ENSMA, CNRS, France

L.-E. Brizzi
Laboratoire d’etudes aerodynamiques, UMR 6609 SP2MI, Boulevard Marie et Pierre Curie, Teleport 2 BP 30179 86962, Futuroscope Chasseneuil, France; Université de Poitiers ENSMA, Futuroscope Chasseneuil, France

Eva Dorignac
Institut Pprime, Departement Fluides, Thermique et Combustion. Axe COST. ENSMA - Universite de Poitiers - BP 40109. 1, avenue Clement ADER. 86961 Futuroscope CHASSENEUIL cedex

Matthieu Fenot
Institut Pprime, Departement Fluides, Thermique et Combustion. Laboratoire d'Etudes Thermiques - UMR CNRS 6608 ENSMA - University of Poitiers, BP 40109 - 86961 Chasseneuil Cedex France

Abstract

Time Resolved Particle Image Velocimetry and Infrared Thermography are used to investigate the behaviour of a round jet impinging on a flat plate for a Reynolds number 28 000, for orifice-to-plate distances of 3 or 5 nozzle diameters and for two different nozzles, a contraction and a long tube. The contraction nozzle reveals a different heat transfer distribution on the impinging plate compared to the long tube case, more often used in the literature. The jet is excited by a loudspeaker at Strouhal numbers 0:26, 0:51 and 0:80. This acoustic forcing changes the jet velocity structure, modifying annular vortex rings in the shear layer of the jet and increasing the turbulent values in the whole domain of the jet, including the potential core. The heat transfer is therefore modified, resulting in an increase of the Nusselt number near the jet axis and an alleviation or a shift of the secondary peak.

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