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The turbulent dispersion of particles is of major importance in such diverse applications as liquid fuel and coal combustion, reaction quenching in (for example) petroleum chemistry, sediment transport in rivers and gas-solid separation in cyclones. In recent years there has been increased emphasis on the development of mathematical models to predict the behavior of particles and/or droplets in turbulent flows and these can be grouped under the two Page 490 May, 1984 AlChE Journal (Vol. 30, No. 3) NOTATION U~. U Z , U~ CI,Cz,C, = coefficients in Eq. 6 = constants in the turbulence model CD = drag coefficient Dp = particle diameter k = kinetic energy Re = pDp I upu I / p , relative Reynolds number

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