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Modelling heat transfer in a helically coiled tube heat exchanger

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Old   August 20, 2015, 07:28
Default Modelling heat transfer in a helically coiled tube heat exchanger
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Andrew Vella
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I am trying to model the heat transfer in a helical tube heat exchanger. I have validated a model using single-phase flow with a comparison of the simulated velocity fields and pressure drop to experimental data. However, it seems that I have a few issues with respect to the heat transfer simulation.

I have specified the inlet temperature at the velocity-inlet as well as the heat flux and heat generation rate at the wall-fluid boundary conditions. I did not change the FLUENT default temperature at the pressure outlet. Any ideas whether I am on the right track?
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Old   August 20, 2015, 13:30
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Quote:
Originally Posted by Lancashire View Post
I have specified the inlet temperature at the velocity-inlet as well as the heat flux and heat generation rate at the wall-fluid boundary conditions. I did not change the FLUENT default temperature at the pressure outlet. Any ideas whether I am on the right track?
The heat generation rate is not a wall "boundary condition". Did you overspecify the boundary condition? It should be specified temperature, heat flux, convective heat transfer, etc. Is this a coupled/conjugate heat transfer problem and you are modelling the wall conduction also?

By temperature at the pressure outlet, I think you are referring to the backflow temperature specification. This temperature is only used if there is backflow.
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Old   August 21, 2015, 09:06
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Many thanks for your reply. It seems that I may have overspecified the boundary conditions. As such I am not really interested in the wall conduction at this stage. Hence, with the return (inlet) temperature and heat flux I should be able to simulate the change in the bulk fluid temperature with flow along the heat exchanger?
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Old   September 13, 2015, 13:15
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Could you tell me as i have a similar case ?

I tried to study axial velocity along the helical body ,, but in fluent the axial velocity does not equal that velocity.
I have entered the inlet velocity b.c as absolute velocity,,the problem does not persist.
Also,Is there availability to get the axial velocity at any cross section/plane using the angle through the planer ?
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