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temperature gain in the flow field due to solar radiation

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Old   April 10, 2012, 19:45
Default temperature gain in the flow field due to solar radiation
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I want to simulate temperature distribution due to the heat gain by the solar radiation in the transparent pipe.
i defined the velocity inlet, and outflow BC. and semi transparent wall with transmissivity of 1.
and defined the absorption coefficient for the fluid.
and solar ray tracing model.
but I don't see any temperature increase, and total temperature at the outlet is exactly equal to the inlet temperature.
can anyone tell me what is the problem?, i put many times on it, and I am tired of searching on the internet.
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Old   April 10, 2012, 22:33
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a few questions just to know more about your setup..

what velocities are you getting? how long (e.g. minutes) are you running your simulations? can you show your geometry?
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Old   April 11, 2012, 08:07
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Thank you so much for the reply, in fact i have tried the steady solution, you think i should try unsteady??
the geometry is a simple cylindrical pipe. i defined inlet velocity as 0.1 [m/s].
I attached the velocity magnitude profile. if you need another information please tell me. thanks.
Untitled.jpg
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Old   April 13, 2012, 11:53
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could the temperatures are not changing due to the effective cooling at velocity 0.1m/s?
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