On turbulent transfer of heat, momentum and suspended matter in a density flow

By the data of full-scale experiments, the features of turbulent heat diffusion in a suspension flow are investigated. The methods for the process theoretical description are developed. A unique method for computing the turbulent thermal diffusivity vertical distribution is proposed. Comparing this distribution with the momentum and suspension transfer coefficient profiles, the regularities of the Prandtl and Schmidt numbers variation with altitude above the bottom level are identified. Mechanisms of the effect of suspended matter on heat transfer in an internal-wave flow are analyzed. The observed effects are described by a semi-empirical dependence of the Prandtl number on the Richardson and Turner numbers.