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- W2028704792 abstract "Proper modelling of chemical and physical processes of pollutants in the atmosphere and tests under controlled conditions may be made to complement field measurements in reducing the cost and time and the uncertainty due to changing meteorological conditions in field measurements. With knowledge gained from correlating model and field tests, proper modelling and model testing permit prediction and checking of performance of a given design of an emission source. The design parameters may include stack height, ejection speed, and its location with respect to buildings and topography. Proper modelling calls for design and testing based on accurate similarity relations. For gaseous or particulate components k in a gravitational field of acceleration g, hydrodynamic field of characteristic velocity U, electric field of characteristic potential V, and charge to mass ratio (q/m)k with reaction rate constant kjm with components j's of number densities nj's, surface interaction rate k8 with surfaces of area to volume ratio S, diffusivity Dk, characteristic dimension L, characteristic time t, primary similarity parameters are: (tU/L), (-rg/U), (Dk/UL), or (Dkt/L2), (k3n5L/U), etc., (k8S8L/U) etc., and (Tk(q/m)k) V/LU). With programmed testing of a proper model, the diffusion phenomenon, for instance, over a year from an actual installation can be checked by one day of testing according to the parameter (Dkt/L2) of model and prototype. Obviously, the above similarity relations cannot all be satisfied at once. A complete check on an installation would take several model tests. Specific cases and details discussed are: (a) actual stack plume rise based on Sutton's diffusivity as compared with wind tunnel test results which satisfy relations based on Tollmien's diffusivity; (b) diffusion and fall-out in relation to relaxation time; (c) correction for chemical reaction rates." @default.
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- W2028704792 date "1970-01-01" @default.
- W2028704792 modified "2023-10-17" @default.
- W2028704792 title "Modelling and similarity relations of physical and chemical processes" @default.
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- W2028704792 doi "https://doi.org/10.1351/pac197024040721" @default.
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