Performing only convection analysis for a heat sink with a Fin

karyan07 · January 3, 2021, 11:32

Hello everyone,

I have been working on a conjugate heat transfer problem for a setup with a constant heat source as the base and cylindrical fins on the top (as shown in the attached image).

Now I want to simplify the model to only forced convection and neglect the conduction happening in the fin body so that I can make it Quasi-3D for simplification.

I am not sure how I can do that in ANSYS Fluent and hence I would be grateful if anyone could let me know where to start.

Thank you very much.
Karthik

AlexanderZ · January 4, 2021, 04:43

change all boundary conditions of the fin body from coupled to heat flux, keep default value 0

karyan07 · January 4, 2021, 14:09

Hello AlexanderZ,

I tried this, but the boundary conditions for the fin body was already the heat flux set to zero. I have another thing I can do. I want to make them uni-thermal fins, by having uniform temperature distribution in each of the fins so that I can make them Quasi-3D. Is this possible?

Please find attached images that explain what I have and what I intend to have.

Thanks again.

LoGaL · January 4, 2021, 16:10

I am really throwing random suggestion here: what if you increase a lot the heat conductivity of the solid? Iwould blindly try it but I am not sure about it

karyan07 · January 4, 2021, 18:49

Hey LoGaL,

That could help, but I would not want to do that because I want the results to be comparable to the 3D results. My aim is to just make this Quasi-3D by a few assumptions. Changing the conductivity would be a big change which would not be of any use to me.

Thanks for the suggestion though.

January 4, 2021, 04:43		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	change all boundary conditions of the fin body from coupled to heat flux, keep default value 0 __________________ best regards ****************************** press LIKE if this message was helpful

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January 4, 2021, 16:10		#4
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 375 Rep Power: 12	I am really throwing random suggestion here: what if you increase a lot the heat conductivity of the solid? Iwould blindly try it but I am not sure about it

January 4, 2021, 18:49		#5
karyan07 New Member Karthikeyan Kurinjivanan Join Date: Jul 2020 Location: Braunschweig, Germany Posts: 4 Rep Power: 6	Hey LoGaL, That could help, but I would not want to do that because I want the results to be comparable to the 3D results. My aim is to just make this Quasi-3D by a few assumptions. Changing the conductivity would be a big change which would not be of any use to me. Thanks for the suggestion though.