Polydisperse Systems of Spherical Particles

For the analysis of mass and heat transfer processes in polydisperse systems, the distribution function f(a) of particles with respect to their size is introduced satisfying the normalization condition 

The total number N of particles in the system is calculated according to the formulas 

Using the results of [473] obtained for the flow field in the point force model, one can find the mean Sherwood number for a polydisperse system of particles [74]  

If the distribution function is known, then the calculation of the moments bm is easy. Usually, the function f(a) is assumed to be exponential or Maxwellian. Some methods for the experimental determination of f(a) are described in [454], 

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