Turbulent Transport of Concentration Correletion of Urban Air Pollution

Very recently, in the air pollution meteorology the usual practice of neglecting the concentration correlation in photochemical reaction has been recognized as a source of serious error and it is shown that in the case of pure mixing (without chemical reaction) the concentration of air pollution decays in a natural way but if the concentration selected is the chemical reactant then the effect is that the transport of air pollution is much more faster (Kumar and Patel 1974, 1975; Patel 1974, 1976, 1983, 1984, 1992, 1998; etc.). The practical applications of concentrations of chemical flow occurs whenever the process of turbulent flow and chemical reaction are merge, particularly when the reactant species are nonuniformly distributed. The urban air pollution is an interesting case of this problem because the pollutants are introduced in the atmosphere at the various locations so that large concentration inhomomgeneities exist before the pollutants are brought togather by moviments and mixing large scale masses by atmospheric turbulent winds. This is common in the case of auto exhusts when the pollutants are discharged and subsequently mixed and react in the atmosphere. Since the first work of Corrsin (1958) about the turbulence on chemical reaction, there is an extensive literature on the subject. However the future work is needed on the study of various aspects of concentration correlations of air pollution with chemical reaction. In the study the turbulent transport of concentration correlation with chemical reaction of urban air pollution is obtained by using the model of Pao (1965) and the method of Goulart et al. (2002). The results of this study also show that in the case of pure mixing the concentration of air pollution decays in a natural manner but if the concentration selected is the chemical reactant then the effect is that the dispersion of air pollution is much more rapid.