Turbulent heat transport in two-and three-dimensional temperature fields

Turbulent heat and mass transport processes in two- and three-dimensional convective flows are presented. The model of turbulence employed is the type referred to as a second-order closure. Parallel ideas were utilised in obtaining a model for turbulent heat and mass transfer processes. The problem of nonaxisymmetric convective heat and mass transport in pipes, which arises when the boundary conditions are not axisymmetric is studied. To expand the available data base an experiment was conducted to obtain heat transfer measurements in strong three-dimensional heating conditions. Numerical procedures especially suitable for incorporation of second-order turbulent closure models were developed. The effect of circumferential conduction in the tube material, which is influential in the asymmetric heating data currently available, was accounted for directly by extending the finite difference calculations into the pipe wall.