variable heat flux as boundary conditions at a trapezoidal receiver in a CSP plant

Louiza RBH · September 27, 2016, 07:22

Hello everybody,
I'm PhD student and i'm looking for temperature distribution on my trapezoidal receiver for Linear Fresnel Mirrors.
Using Tonatiuh and Mathematica, i obtained heat flux distribution (W/m2) and now i'm using Comsol to find temperature distribution.
The heat flux is not constant so i'm asking you how can i use my variable heat flux in boundary conditions.
I thank you in advance for attention you will give to my message.
In conclusion, i have variable heat flux boundary conditions.

meusha · September 29, 2016, 07:32

The heat flux should be expressed as a function of location i.e.

h=f(x,y,z)

You should then enter this function as the boundary condition under the right domain, instead of using a fixed value. You must know the ANSYS CFX syntax to be able to translate the actual function in to something that is understandable by ANSYS.

Louiza RBH · September 29, 2016, 07:43

Thank you meusha for your help.
I think it's exactly what i have to do. I'm looking for this function but considering the angle (teta), because my heat flux varies as a function of it.
I'll define angle= f(x,y) in the variables icon so the software can recognize teta.
Thank you again for your response and for the importance that you gave to my message

September 27, 2016, 07:22	variable heat flux as boundary conditions at a trapezoidal receiver in a CSP plant	#1
Louiza RBH New Member Louiza RABHI Join Date: Sep 2016 Posts: 2 Rep Power: 0	Hello everybody, I'm PhD student and i'm looking for temperature distribution on my trapezoidal receiver for Linear Fresnel Mirrors. Using Tonatiuh and Mathematica, i obtained heat flux distribution (W/m2) and now i'm using Comsol to find temperature distribution. The heat flux is not constant so i'm asking you how can i use my variable heat flux in boundary conditions. I thank you in advance for attention you will give to my message. In conclusion, i have variable heat flux boundary conditions.

September 29, 2016, 07:32		#2
meusha New Member No Real Name Join Date: Sep 2016 Posts: 4 Rep Power: 9	The heat flux should be expressed as a function of location i.e. h=f(x,y,z) You should then enter this function as the boundary condition under the right domain, instead of using a fixed value. You must know the ANSYS CFX syntax to be able to translate the actual function in to something that is understandable by ANSYS. Louiza RBH likes this.

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September 29, 2016, 07:43		#3
Louiza RBH New Member Louiza RABHI Join Date: Sep 2016 Posts: 2 Rep Power: 0	Thank you meusha for your help. I think it's exactly what i have to do. I'm looking for this function but considering the angle (teta), because my heat flux varies as a function of it. I'll define angle= f(x,y) in the variables icon so the software can recognize teta. Thank you again for your response and for the importance that you gave to my message