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Abstract
The flow in a twisted circular-sector duct is solved numerically for a steady, incompressible, hydrodynamically and thermally fully developed laminar flow. The wall of the duct is subjected to uniform heat flux per unit axial length with peripherally uniform temperature. A rotating cylindrical coordinate system is introduced to simplify the governing equations to two independent variables. The stream function and vorticity are adopted instead of the primitive variables of velocity and pressure. Friction factor and Nusselt number are presented for values of the duct angle from 11.25 to 90°, dimensionless twist ratio up to 0.7, and Prandtl number from 1 to 100. The results show that the influence of twist on friction and heat transfer is significant at high Reynolds numbers and high Prandtl numbers.