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Tube Wall - Roughness Coefficients

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Old   November 23, 2011, 11:00
Default Tube Wall - Roughness Coefficients
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Ronald A. Lau
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We currently model the exterior of tube walls (the boundary of our model) that look like this: 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.


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bcs, walls

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