ABSTRACT
In heat exchangers, conical spiral tubes are used to enhance heat transfer. The variation of Nusselt number around the circumference of tube cross section is not widely reported in the literature related to conical spiral tube. The present study focuses on the velocity and temperature profiles at 45 and 225° angle from the start of the fluid flow using numerical simulation results. The coil with pitch circle diameter 100 mm, tube diameter 20 mm and cone taper angle 20° was modeled for simulation of boundary conditions of 0.5 m/s inlet velocity, 300 K inlet fluid temperature and 320 K constant wall temperature. The results show that the velocity profile is complex at 225° angle as compared to 45° angle. The highest value of Nusselt number is observed at the outermost side of the tube while the lowest is partially offset from the inner side of tube.
