PACKED BED CHARACTERISTICS FOR BINARY IRREGULAR PARTICLE SYSTEMS

摘要

Packed beds are characterized by such factors as representative sizes for irregular particles, their distribution, porosity, and shape parameters under fluid flow conditions with interesting the pressure loss. And previous researches have been mainly analyzed under the conditions that the particles have a set of a certain diameter and one of various porosity functions. These may leave include compensative relations between the two. Previously, we determined the specific surface area diameter for irregular particles of which surface area and volume were determined beforehand, via image (contour) analysis aided by the Fourier transformation, and we also extended the Fourier method to multiple particles system. The present report includes the flow experiments through one irregular but sieve-sorted particles bed and through binary mixtures of different shapes and sizes. As the result, we confirmed that the well known Blake-Kozeny-Carman's equation for the porosity function was applicable to all runs and the estimated specific surface area diameter and its additive one for binary systems were expectedly effective. In this paper, the estimation method of the diameter, effects of binary particles layers configuration, and mixing ratio, and the special case of spherical particles are included.