Meteorology for Air Pollution Control Engineers39

Meteorology for Air Pollution Control Engineers39 -...

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Meteorology & Air Quality Lecture-III
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Dispersion = Advection (Transport) + Dilution (Diffusion) Fick’s law of diffusion J= - D * D C/Dx Where, J= Mass Flux; D = Diffusivity coefficient,; D C/Dx = Concentration gradient Diffusion of pollutants occur due to turbulence, which further depends upon many factors: a. Ambient temperature b. Temperature of emissions c. Roughness factors d. Wind velocity e. Wind direction f. Humidity g. Stability Source Receptor Transport Re-entrainment
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Air Pollutant Cycle
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Dispersion General mean air motion Turbulent velocity fluctuations Diffusion due to concentration gradients – from plumes Aerodynamic characteristics of pollution Particles Size Shape Weight
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Turbulence Not always completely understood Two types: Atmospheric heating Causes natural convection currents --- discussed Thermal eddies Mechanical turbulence Results from shear wind effects Result from air movement over the earth’s surface, influenced by location of buildings and relative roughness of terrain.
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