Diffusion cross-wind

Hughes, T. J.R. and Brooks, A.N., 1979, A multidimensional upwind scheme with no cross-wind diffusion. In Hughes, I . J. R. (ed.), Finite Element Methods for Convection Dominated Flows, AMD Vol. 34, ASME, New York. 

To apply Equation (3), it is necessary to determine the diffusion coefficients Oy and o. The diffusion coefficients can be related to the deviation in the wind direction, given by o, in the azimuth angle (azimuth refers to the lateral or cross-wind direction), and o in the deviation angle (deviation refers to... 

Typical Horizontal Eddy Diffusivities and Cross Wind Standard Deviations... 

Brzustowski, T.A., Gollahalli, S.R., Gupta, M.P., Kaptein, M. and Sullivan, H.E. 1975a. The Turbulent Piydrogen Diffusion Elame in a Cross Wind. Combustion Science and Technology, (11). 

T urbulent diffusion Flames in cross-wind Fuel propane... 

Gollahalli, S. R., Brzustowski, T. A., and Sullivan, H. F. "Characteristic of a Turbulent Propane Diffusion Flame in a Cross-Wind." Transactions of the Canadian Society for Mechanical Engineers 3, no. 4 (1975) 205-14. 

Kalghatgi, G. T. "Blow-Out Stability of Gaseous Jet Diffusion Flames Part 11 Effect of Cross Wind." Combustion Science and Technology 26 (1981) 241 4. 

Kalghatgi, G. T. "The Visible Shape and Size of a Turbulent Hydrocarbon Jet Diffusion Flame in a Cross-wind." Combustion and Flame 52 (1983) 91-106. 

Brzustowski, T. A. "Turbulent Diffusion Flame Models 111 The Buoyant Flame in a Cross-Wind." Proceedings of 5th Canadian Congress of Applied Mechanics, University of New Brunswick, Fredericton, 1975. 

In practice, a solid catalyst is most conveniently modeled as a quasi-homo-geneous phase. Even if the catalyst particle is porous, visualize it as a homogeneous, but permeable solid. Mass transfer in its interior is retarded by two effects obstruction of part of the cross-sectional area by the solid material, and diffusion paths that are longer because molecules have to wind their way around the obstructions (tortuosity effect). In the quasi-homogeneous model, the retardation is accounted for by the use of appropriately smaller "effective mass-transfer or diffusion coefficients. 

The solid sorbent diffusional dosimeter usually consists of a small badge-like container which can be attached to a worker or placed in an area for sampling. It is basically composed of a diffusion space or a group of spaces with a defined length to cross sectional area ratio. A porous wind screen may be used to define the opening and the solid sorbent, usually bound in a pad, is placed at the opposite end of the space. 

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