Abstract This work represents the experimental investigation results for turbulent flow heat transfer in a horizontal pipe by using double coil wire inserts and air as working fluid, experiments were carried out for a tube with and without double coil wire inserts at constant heat supply and different mass flow. The double coil wire insert are four different pitch of 12, 14, 16 and 18 mm and three different wire diameter of 1.6, 2 and 2.6 mm for outer coil and 0.9, 1.2 and 1.5 mm for inner coil wire diameter with 25 mm outer coil and 11 mm inner coil diameter. The Reynolds number varied from 4000 to 7242. Both heat transfer coefficient and pressure drop are calculated and the results are compared with those of bare tube. It was found that the enhancement of heat transfer with double coil wire inserts as compared to plain tube varied from 3 to 46% for various inserts. Also the results are compared with the plane tube without insert. Keywords: Enhancement efficiency, heat transfer, Double coil wire inserts, High/low density, pressure dropCite this Article Pathan Abdul Hai Khan, Sandip Kale. Performance analysis of double coil wire inserts for heat transfer in a circular tube. Journal of Refrigeration, Air conditioning, Heating and Ventilation. 2015; 2(3): 25–33p.
