UNSPECIFIED (2002) Numerical study of momentum and heat transfer in unsteady impinging jets. INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 23 (5). pp. 592-600. ISSN 0142-727X

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Abstract

Direct numerical simulations of an unsteady impinging jet are performed to study momentum and heat transfer characteristics. The unsteady compressible Navier-Stokes equations are solved using a high-order finite difference method with non-reflecting boundary conditions. It is found that the impingement heat transfer is very unsteady and the unsteadiness is caused by the primary vortices emanating from the jet nozzle. These primary vortices dominate the impinging jet flow as they approach the wall. Detailed analysis of the instantaneous flow and temperature fields is performed, showing that the location of primary vortices significantly affects the stagnation Nusselt number. Spatio-temporal behaviour of the heat transfer is analysed, with instantaneous C-f and Nu variations showing the correlation between the local heat transfer and the flow field. Near the secondary vortices, the breakdown of the Reynolds analogy is observed. (C) 2002 Elsevier Science Inc. All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics T Technology > TJ Mechanical engineering and machinery
Journal or Publication Title:	INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
Publisher:	ELSEVIER SCIENCE INC
ISSN:	0142-727X
Date:	October 2002
Volume:	23
Number:	5
Number of Pages:	9
Page Range:	pp. 592-600
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/10819

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