temperature gain in the flow field due to solar radiation

amir7 · April 10, 2012, 20:45

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.

smsc59 · April 10, 2012, 23:33

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?

amir7 · April 11, 2012, 09:07

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

smsc59 · April 13, 2012, 12:53

could the temperatures are not changing due to the effective cooling at velocity 0.1m/s?

April 10, 2012, 20:45	temperature gain in the flow field due to solar radiation	#1
amir7 New Member Join Date: Mar 2012 Posts: 12 Rep Power: 15	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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April 10, 2012, 23:33		#2
smsc59 New Member Smsc S Join Date: Feb 2012 Posts: 5 Rep Power: 15	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?

April 11, 2012, 09:07		#3
amir7 New Member Join Date: Mar 2012 Posts: 12 Rep Power: 15	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

April 13, 2012, 12:53		#4
smsc59 New Member Smsc S Join Date: Feb 2012 Posts: 5 Rep Power: 15	could the temperatures are not changing due to the effective cooling at velocity 0.1m/s?