Study on collecting efficiency of granular bed filter in non-stationary
颗粒层非稳态过滤捕集效率的研究

In order to calculate collecting efficiency of granular bed filter, the calculating formula of collecting efficiency of non-stationary was obtained by improving classic filtration model and considering particles deposited in filtration media,and filtration efficiency formula of classic theory is special case of this paper formula.Theory calculation formula was conceal function, which could not been used in engineering easily, so that orthogonal experimental test was made by fives factors, which were filtration time, filtration velocity, thickness of granular bed, dust concentration and diameter of particles. The dominance formula of filtration efficiency relationship with its influence factors was obtained; the basic accordant result was obtained by result of formula calculation comparing with the result of experimental test.