Technical Briefs

Numerical Study on Stagnation Point Heat Transfer by Jet Impingement in a Confined Narrow Gap

[+] Author and Article Information
Y. Q. Zu

School of the Built Environment, University of Nottingham, Nottingham NG7 2RD, UK

Y. Y. Yan1

School of the Built Environment, University of Nottingham, Nottingham NG7 2RD, UKyuying.yan@nottingham.ac.uk

J. Maltson

 Siemens Industrial Turbomachinery Limited, Lincoln LN5 7FD, UK


Corresponding author.

J. Heat Transfer 131(9), 094504 (Jun 25, 2009) (4 pages) doi:10.1115/1.3139183 History: Received September 04, 2008; Revised February 19, 2009; Published June 25, 2009

In this paper, the heat transfer characteristics of a circular air jet vertically impinging on a flat plate near to the nozzle (H/d=16, where H is the nozzle-to-target spacing and d is the diameter of the jet) are numerically analyzed. The relative performance of seven turbulent models for predicting this type of flow and heat transfer is investigated by comparing the numerical results with available benchmark experimental data. It is found that the shear-stress transport (SST) kω model and the large Eddy simulation (LES) time-variant model can give better predictions for the performance of fluid flow and heat transfer; especially, the SST kω model should be the best compromise between computational cost and accuracy. In addition, using the SST kω model, the effects of jet Reynolds number (Re), jet plate length-to-jet diameter ratio (L/d), target spacing-to-jet diameter ratio (H/d), and jet plate width-to-jet diameter ratio (W/d) on the local Nusselt number (Nu) of the target plate are examined; a correlation for the stagnation Nu is presented.

Copyright © 2009 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 4

Effects of L/d on Nusg

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Figure 5

Effects of H/d on Nusg

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Figure 6

Comparison of numerical results with correlation: (a) H/d=3.0, L/d=50; (b) H/d=3.0, W/d=20; and (c) L/d=50, W/d=20

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Figure 1

The physical domain and boundary conditions

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Figure 2

Local Nusselt number distribution on the positive x-axis

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Figure 3

Effects of W/d on Nusg



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