A theoretical and experimental study of turbulent forced convection between two parallel plates, subjected to a sinusoidally varying inlet temperature, is presented. The previous work on laminar flow is extended to a more realistic situation, turbulent flow, since most of the flows in practice are generally in the turbulent regime. A boundary condition which accounts for the effects of both external convection and wall thermal capacitance is considered. The analytical solution is obtained through extending the generalized integral transform technique. An experimental apparatus was designed, built and used for the experimental study to provide validation of the mathematical modeling employed. Analytical solutions are compared with the experimental findings. A satisfactory agreement is obtained when the non-uniform inlet temperature amplitude profile obtained experimentally is incorporated into the theoretical model. Furthermore, the effects of the modified Biot number, the fluid-to-wall thermal capacitance ratio and the Reynolds number on the temperature amplitude along the channel are also discussed for turbulent flow.