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-   -   Tube Wall - Roughness Coefficients (http://www.cfd-online.com/Forums/fluent/94720-tube-wall-roughness-coefficients.html)

ronaldalau November 23, 2011 11:00

Tube Wall - Roughness Coefficients
 
We currently model the exterior of tube walls (the boundary of our model) that look like this:

http://w30.indonetwork.co.id/pdimage...1_walltube.jpg

...as flat walls without a boundary layer mesh. (Can['t do it anyother way due to limited computing and time resources.)

The mesh height on the walls is 8" to 12", and the tubes are 2-1/2" OD (R1-1/4")

Does anyone have any experience on the best Roughness Height and Roughness Coefficient to use for this situation? Radiation is dominant, but Convection and Conduction are not negligible.

TIA,

R.


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