Learning Forum

[Dio]

Hi,

I have Re=20,000, 165mm long, 15mm*15mm channel and trying to calculate Nu number.

Tin=300K

Charc. Lenght= 15mm

300 W/m^2 heat flux at top and bottom surface

Based on Nu= 0.023 Re^0.8 * Pr^0.4 = 0.023* 20000^(0.8)*0.7441^(0.4)=56.39

When I select like below, result looks different.

How should I calculate Nu? What can be the post processing expression formula?

Thank you,

Anton

[Rob]

Look in the User's Guide for the exact definition https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v212/en/flu_ug/flu_ug_fvdefs.html (hint, use the Rules & Guidelines if you can't open the link).

[Dio]

Thank you Rob, I was looking for formulas like below videos. I hope these will be usefull for future users.

https://www.youtube.com/watch?v=mv3uDy7ZuCY
https://www.youtube.com/watch?v=3YJhB7VmVEw&t=2s
https://www.youtube.com/watch?v=YXkGqLC64-Q

[DrAmine]

Videos might be helpful but always rely on the official and up to date Ansys Help Websites :)

[Dio]

You are right you guys doing amazing job. I learned alot in this website.