CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   How to set Prandtl number in natural convection in a heated cavity (http://www.cfd-online.com/Forums/fluent/118299-how-set-prandtl-number-natural-convection-heated-cavity.html)

krunalgangawane May 24, 2013 09:43

How to set Prandtl number in natural convection in a heated cavity
 
Hello 2 all,
I am solving 2d natural convection in an differentially heated cavity.
I have used 100*100 grids domain,,,
I have problem in setting Prandtl number..I have 2 solve problem for 5 different Pr and theree Rayleigh numbers..
Procedure I am using:

From the defination of Calculate Value of beta (coeff of thermal expansion) from chosen values of g, DeltaT, density, viscosity, charct lenght and k.

fro setting Pr=(Cp* mu)/k,
let Cp=Pr,
so mu=k;

for different Pr, change values of Cp=Pr
, by this procudure, i am getting correct values of avergae Nu along hot wall..
but by changing Pr, chnage in values of Nu is negligible.
..Can anybody tell me correct way of solving, this problem for range of Pr?

Thanks and regards,


All times are GMT -4. The time now is 06:35.