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Roughness effect

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Old   April 23, 2004, 01:47
Default Roughness effect
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I analysing surface roughness effect on heat transfer and friction coefficient.I included roughness in the geometry as rectangular ribs.In wall boundary condition I put zero roughness height.I am getting good results for heat transfer but for fiction coefficient it gives value similar to smooth wall.If I give roughness height equals to rib height the heat ransfer anf friction coefficient both becomes very high.How I can get reasonable values of both heat transfer and friction coefficient for rib roughness in the same solution?
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