A Study on the Turbulence Models for Vertical Thermal Diffusion Phenomena in Thermal Effluent

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  • ７．流体力学　　温排水の鉛直熱拡散現象に対する乱流モデルに関する研究

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A condenser cooling sea water discharged from a coastal power plant has been diffused by thermally -stratified turbulent shear flow at temperature rise of the order of 7°C into the sea area, It is principal to perform protection of environment. An accurate diffusion prediction is playing a very important role in a pollution control and design. The turbulence models related to the thermal effluent are analyzed based on transport equations for an incompressible fluid and a non-isothermal fluid, which have been discussed for their validity. It is the purpose of this paper that the distributions in water depth direction such as thermal eddy diffusivity Kz, eddy viscosity νtz, turbulent Prandtl number σt, turbulent kinetic energy κ, velocity, water temperature, etc. are analyzed based on a theory on local equilibrium transport equations for the Reynolds stresses and the heat-flux correlations, whose models are connected with a theory on Kolmogoroff's locally isotropic turbulence as a background. There are significant differences between thermal effluent and density current at tidal river mouth. Thermal effluent shows its own characteristics in the range of 0.15<Ri<0.6.

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