Laboratory investigations for development of design criteria for varying shapes of protective filters

摘要

Laboratory investigations have been carried out in the past regarding the design of protective filters based on the controlling constriction size of the filter mass. In all such studies, the particle shape has been considered spherical. However the fact remains, that the controlling constriction size changes with shape of filter particles. The present study is an attempt to assess the effect of shape on controlling constriction size usually based on the concept of spherical shape, and subsequently observe its effect on the design criteria adopted for filters. Based on laboratory investigations for three different shapes of filter material i.e. elliptical, sub-rounded and irregular, the improvements to the existing filter design criterion are proposed in this study by way of correction factors for each shape of filter material.