A study of the porosity of gas filtration cakes

Abstract

The purpose of this work was to determine the porosity of gas filtration cakes composed of powdery organic and inorganic materials, employing a technique whereby an optical microscope generates images of the powdery layer deposited on the surface of the filtering medium. To this end, experimental cake filtration porosity data were obtained as a function of the surface filtration velocity. The images generated by the optical microscope were analyzed by using an image analyzing program that supplied the cake porosity values. The results revealed that porosity decreases as surface filtration velocity increases. The average porosity of corn starch was higher than that of tapioca powder and phosphate concentrate, possibly due to the shape of the particles, differences in the physicochemical characteristics of the materials, and grain distribution. Based on the relation of the experimental average porosity data and the filtration velocity, an empirical correlation was found that better fit these parameters

Experimental investigation of deposition and removal of particles during gas filtration with various fabric filters

“…However, this study was limited to a single particulate, powdered phosphate rock, of density (q) 3.100 kg/m 3 and sphericity (/) 0.59. It must be stressed that the characteristics of the particulate material also affect the formation and removal of gas filter cakes and have been investigated by some researchers [12,27,28].…”

Exploring the Key Factors in Dusty Gas Filtration: Experimental and Modeling Studies

“…Membrane pores will be blocked when the dust particle size is smaller than the pore size of the membrane. The porosity of the pore blocked membrane can be evaluated by , where q ( x ) is the particle size distribution function, Q ( d m ) is the particle size cumulative distribution function, and ε m is the porosity of the membrane after pore blocking.…”

“…Membrane pores will be blocked when the dust particle size is smaller than the pore size of the membrane. The porosity of the pore blocked membrane can be evaluated by 37,38 Ä…”

Comparative Study of Helicopter Engine Particle Separators

“…Much of the research concentrates on determining cake porosity as a funciton of particulate properties, and the ease of slurry break-up during reverse-flow cleaning (Refs. [14][15][16][17]. Many of the studies in the literature use low Reynolds number Stokesian flow through the cake, which maybe typical of the application on which they are based.…”