Coefficient of dispersion

Table 3.14 Diffusion coefficients of disperse dyes in hydrophobic fibres [112]...

Table 3.15 Relative diffusion coefficients of disperse dyes [113]...

Yen. C.-P.C., Perenich, T.A., and Baughman, G.L. Fate of dyes in aquatic systems II. Solubility and octanolAvater partition coefficients of disperse dyes, Environ. Toxicol. Chem., 8(ll) 9981-986, 1989. 

The high value of the proportionality coefficient between the relative viscosity coefficient of dispersions and their free volume , in our opinion, is due to the extremely high contribution of the surface friction of contacting particles in such highly-concentrated dispersions. 

Lower limit of critical particle diameter, m Upper limit of critical particle diameter, m Coefficient of dispersion, m /s Dimensionless coefficient of dispersion... 

Use the rule of thumb that if the coefficient of dispersion 1, the distribution is likely to be Poisson. 

Coefficient of dispersion = s2/Y. This is an alternative measure of dispersion to the coefficient of variation (p. 268)... 

Thus during the steady-state stage of isothermal mass transfer the cube of average radius grows linearly with time the growth rate is a function of interfacial tension, as well as of the solubility and diffusion coefficient of dispersed substance. If an admixture that is nearly insoluble in a continuous phase is introduced into the dispersion phase, a sharp decrease in recondensation rate, as well as changes in laws describing the process, may take place. 

Thus we have seen that the rate of change in degree of dispersion in a colloidal system is governed by the solubility and the diffusion coefficient of dispersed substance and by the interfacial tension. The diffusion coefficient, D, in turn, depends to a significant extent on the aggregate state of dispersion medium (very small values of D are typical for solid dispersion media)and, to a lesser extent on the size of molecules of dispersed substance, and, as a rule, can not be altered by introducing any kind of admixtures into the system. At the same time, the presence of adsorption layers at the particle surface (particularly in concentrated dispersions, where such layers fill most of the... 

Turbulent diffusivity is by nonzero wind speed the function of time, location, wind speed and meteorological conditions. The turbulent diffusivity is implemented to the model on the basis of Sutton s definition of coefficients of dispersion. Coefficients of dispersion Oj = (Ty, oi are dependent on atmospheric stability and distance from the source. 

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