enhancement of efficiency of circle tube banks using change of shape of tubes in a special row with turbulent flow

in this paper, analysis of fluid flow and heat transfer over the bank of tubes is considered. k-ω sst model is applied for simulation of turbulent flow. in this paper, the improvement of efficiency of a bundle of circular tubes by changing the shape of the cross section of one row of the pipes to the elliptical cross section as an innovative plan is considered. as know, friction factor in turbulent flow is very important on efficiency of bank of tubes. therefore, replacement of elliptic cross section shape in a special row in the bank of circular tubes is considered. obtained results showed change of tubes in fifth row of the bank of circular tubes with elliptic cross section has been caused 24% increase of efficiency in bank of circular tubes