Effect of Wall Structured Roughness on Friction and Heat Transfer in Pipe Flow

The present study deals with the effects of wall geometry on fluid flow and heat transfer in a circular tube. Rectangular-rib structural wall roughness is considered. This roughness is characterized by rib height, width and pitch. A detailed parametric investigation of the effect of rib width-to-height ratio on the friction coefficient is performed for different rib pitches. This ratio varies from 0.1 to 6.0. Various rib pitches are considered, …