Heat transfer and fluid flow characteristics within non-circular duct

Abstract

Heat transfer and the characteristics of a fluid flow of water flows in the twisted square duct are studied numerically using commercially available software. Numerical investigations of fully-developed laminar fluid flow within duct was performed for water with constant wall temperature boundary conditions, twist ratios of 16.5, 11.5, and 7.5, Reynolds number 100-6000, Prandtl numbers 8 and 10. The numerical results of friction factor and Nusselt number found in this present study were compared with the results obtained from the correlations for the same working fluid such as water. Nusselt number in the twisted square duct is higher than the result found by correlation together with a lower friction factor. Percentage increase in average Nusselt number found for twist ratios 16.5, 11.5, and 7.5 compared to the theoretical values was 25.56, 33.21, and 37.73 The heat transfer coefficients of the square twisted duct are increased with a lower twist ratio and higher Prandtl number.