A resistance-in-series model is developed to quantitatively predict the heat and mass transfer processes for turbulent fluid flow through tubes and circular conduits under uniform wall temperature condition. An analogy between heat, mass and momentum transfer has been suggested using Fanning number (Fa) for momentum transfer. A modified eddy diffusivity expression for the turbulent boundary layer near a smooth wall has been obtained from earlier models. This eddy diffusivity expression is used to predict radial temperature or concentration profile as well as film coefficients that are in good agreement with the experimental studies over wide range of Prandtl or Schmidt numbers. The proposed equations are compared with Chilton-Colburn analogy and other semi-theoretical models using wide range of experimental data. (C) 2000 Elsevier Science Ltd. All rights reserved.