Learning Forum

[Divyang Chauhan]

Hello everyone!

I want to simulate convective heat transfer from the tip of the fin attached to the constant heat flux. The fin is made of aluminum and has a free air stream at 298.16 K. The fin's tip temperature will vary with time. So, the convective heat transfer coefficient will also vary. Hence, convection heat transfer will also vary.

The equation in the photo wanted to be written in the convective heat transfer boundary condition. Using UDF or named expression, anything is possible.

I am thanking you!

[SRP]

 

Hi,

The convective boundary condition can be entered directly in the Ansys Fluent. It is available in the Fluent thus there is no need to write an expression or udf.

Have a look at this: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v222/en/flu_ug/flu_ug_bcs_sec_bound_cond.html

If you are not able to access the link, please refer to this forum discussion: https://forum.ansys.com/forums/topic/using-help-with-links/#latest

Thank you

Saurabh

 

[Divyang Chauhan]

Hello!.

I wanted to give conduction equal to the convection boundary condition. I don't have any fixed convective heat transfer coefficient. The equation I mentioned in the above problem. What option do I need to select? What udf or named expression do I need to write for this? 

[Divyang Chauhan]

I wanted to give conduction equal to the convection boundary condition. I don't have any fixed convective heat transfer coefficient. The equation I mentioned in the above problem. What option do I need to select? What udf or named expression do I need to write for this? 

[SRP]

 

Hi,

The heat transfer coefficient can be determined using a custom variable function.

You can refer to this section of the user’s guide for more information: 37.5. Custom Field Functions (ansys.com)

Additionally, kindly go over the following thread discussion: https://forum.ansys.com/forums/topic/heat-transfer-coefficient/

Thank you

Saurabh