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a doubt with jet impingement

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Old   November 21, 2000, 01:09
Default a doubt with jet impingement
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I am working with jet impingement heat transfer. I am using RSM with non-equilibrium wall functions. i kept the y* above 20 all along.The results are ok .My doubt is whether wall-funtion approach is correct while studying heat transfer.. Will Switching to a two-layer zonal model which uses a one-equation model of Wolfstein be correct physically. Any help is welcome.
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Old   November 21, 2000, 02:20
Default Re: a doubt with jet impingement
John C. Chien
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(1). You are right to point out that these are "models". (2). So, for the results to be correct, the models must be calibrated and validated for a particular problem at hand. (3). If a model is "physically correct", then it is not a "model". In other words, a model is not the real thing.
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Old   November 21, 2000, 16:17
Default Re: a doubt with jet impingement
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I have had more success in "coming close" to matching experimental htc data when using a two-layer turbulence model.

The downside is that this means more grid.

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