Heat transfer in the turbulent flow through a conduit for removal of combustion products

A numerical model was presented to calculate the velocity and thermal fields of turbulent flow through a conduit for removal of combustion products. This study originated in response to an industrial concern to study dynamic behaviour of a smoke conduit connected to a high-efficiency gas boiler working in permanent running mode (steady state), or cyclical non-static running mode (unsteady state). The momentum and temperature fields were calculated via a finite-volume CFD code using the k− turbulence model. The validation of this calculation was conducted employing a full-scale experimentation. Comparisons of temperature fields were made, and the model was shown to give an acceptable quantitative approach for design within the framework of the coarse approximations adopted.