ANALYSIS OF STEADY FORCED-CONVECTION IN THERMALLY DEVELOPING TURBULENT DUCT FLOWS

Presents a novel theoretical approach, based on extension of ideas ass ociated with the generalized integral transform technique, for obtaini ng accurate analytic solutions for fully developed steady forced conve ction inside circular duels with turbulent flow and constant wall surf ace temperature conditions. Within the temperature field, reports the thermal response of the fluid in terms of hybrid solutions for bulk fl uid temperature and Nusselt number distributions along the thermal ent rance region of the duct. Further, in assessing the accuracy and valid ity of the theoretical work, critically examines predicated analytical solutions of thermally developed Nusselt numbers and compares them wi th results from reliable empirical correlations of the open literature . For the investigated cases, satisfactory agreement prevailed between the theoretically and empirically derived heat transfer parameters, e xhibiting a maximum difference of 9.58 per cent for the range of syste m variables analysed.