The influence of particle shape and gradation parameters on the permeability of filter media

In the present study, an effort has been made to determine the effect of shape of filter media particles and their gradation on its permeability. Six different shapes of the graded filter particles, ranging from rounded to flat, were used in the study. Experiments were carried out to assess the variation of permeability with respect to the various shape parameters, viz. sphericity, roundness, shape factor, flatness ratio, elongation ratio, angularity index and the gradation parameters, for each group of the material. A model on the basis of experimental data, obtained in the study was developed which takes into account the variation of the above mentioned shape and gradation parameters for estimation of the permeability through filter media.