Mass Diffusion From a Point Source in a Neutral Turbulent Shear Layer

An investigation of the diffusion of pollutants in neutral surface layer of atmosphere is analyzed here based on a simple phenomenological differential field theory of turbulent shear flows. The variation of the effective turbulent viscosity is governed by a rate equation. The analytical model studied in this work consists of mass diffusion from a continuous crosswind point source at ground level in a turbulent shear layer. The system of governing equations is solved by finite-differences giving the pollutant distributions, eddy diffusivities, and velocity profiles at various downstream locations for various initial and boundary conditions. The computed diffusion data are presented and compared favorably with the available experimental results.