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Old   June 4, 2003, 11:01
Default tube-in-tube
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Andrew
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Hi all, im brand new to CFD. Im trying to model a tube-in-tube heat exchanger using fluent 6.1. The tube is very long and then with fully turbulent flow. Can anyone give some insight as to what kind of turbulent model, mesh and wall treatment to use?

thanks alot Andrew
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Old   June 4, 2003, 11:23
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Dayton
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Do you want to simulate heat transfer too and also conjugate heat transfer.
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Old   June 4, 2003, 12:59
Default Re: tube-in-tube
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Andrew
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yes. one tube has air entering at 400k and the other, air at 1300k
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Old   June 4, 2003, 14:53
Default Re: tube-in-tube
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Dayton
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In case of conjugate heat transfer ..., remember never to use k-epsilon turbulence model, it overpredicts the heat transfer. As you are using Fluent, you can specify velocity directly as inlet condition, outlet you can specify as pressure-outlet. As far as turbulence intensity and length scale are concerned you can use corelations given in Varstegee and Malansekara (hope I have spelled it correctly) for pipe turbulent length scale. I hope with this you can solve your problem.

Regards

Apurva
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