Numerical study of momentum and heat transfer in unsteady impinging jets
Numerical study of momentum and heat transfer in unsteady impinging jets
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 Cf 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.
numerical simulation, impingement, unsteady heat transfer, jet
592-600
Chung, Y.M.
22d862d3-fd74-49fd-8b82-359bc576360d
Luo, K.H.
1c9be6c6-e956-4b12-af13-32ea855c69f3
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97
2002
Chung, Y.M.
22d862d3-fd74-49fd-8b82-359bc576360d
Luo, K.H.
1c9be6c6-e956-4b12-af13-32ea855c69f3
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97
Chung, Y.M., Luo, K.H. and Sandham, N.D.
(2002)
Numerical study of momentum and heat transfer in unsteady impinging jets.
International Journal of Heat and Fluid Flow, 23 (5), .
(doi:10.1016/S0142-727X(02)00155-8).
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 Cf 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.
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Published date: 2002
Additional Information:
The study employed advanced numerical simulation to examine correlation between impinging flow and wall heat transfer in unprecedented detail. It distinguished itself from other studies in that it revealed spatio-temporal correlations in an unsteady phenomena. Cited 10 times including by Goldstein RJ, Eckert ERG, Ibele WE, et al. (2005) in ``Heat Transfer – a Review of 2002 Literature’’ Intl. J. Heat and Mass Transfer 48 (5): 819-927. Impact factor 1.052.
Keywords:
numerical simulation, impingement, unsteady heat transfer, jet
Identifiers
Local EPrints ID: 22164
URI: http://eprints.soton.ac.uk/id/eprint/22164
ISSN: 0142-727X
PURE UUID: b2f6e3a9-59e5-4227-996d-e6b68c6bd05b
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Date deposited: 20 Mar 2006
Last modified: 16 Mar 2024 03:03
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Contributors
Author:
Y.M. Chung
Author:
K.H. Luo
Author:
N.D. Sandham
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