An Experimental Study on Collection Efficiency by Model Filter

The mechanism of the removal of aerosol particles was experimetally studied with a model filter. The model filter was composed of four filter elements which were manufactured by sticking glass fibers on a brass plate. The diameters of the fiber were 40μ and 80μ and the porosity of the filter was 0.75-0.88. The aerosols whose diameters were 0.7μ and 1.0μ were prepared with Sinclair-La-Mer type generator and stearic acid was used as aerosol particles. The experiment was carried out with the conditions that Re=dfuₛρ/μg were ranged between 0.1 and 1.0. In some cases there seemed to appear minimum collection efficiency. The results were analyzed by Fucks' model filter theory

EFFECT OF DRYING ON POWDER COATING EFFICIENCY AND AGGLOMERATION IN VIBRO-FLUIDIZED BED

Glass beads of 43 m were coated in a vibro-fluidized bed by atomizing a fine silica powder together with polyvinyl alcohol aqueous solution. The coating efficiency and weight fraction of the agglomerated particles were measured under various experimental conditions, and their dependencies on the frequency and the direction of vibration were investigated. The coating efficiency and the degree of the agglomeration among core particles correlated well with an index R. The index R was introduced to evaluate quantitatively the drying conditions in a fluidized bed. Application of vertical vibration on the fluidized bed lowered the coating efficiency somewhat, while it prevented agglomeration. From the experimental results it was confirmed that coating with high quality and high efficiency, where few agglomerates were produced and silica powder was utilized efficiently, was possible in a vibro-fluidized bed with adequate vibration frequency and orientation of the vibration vector

Effect of Drying on Powder Coating Efficiency and Agglomeration in Vibro-Fluidized Bed

Glass beads of 43 m were coated in a vibro-fluidized bed by atomizing a fine silica powder together with polyvinyl alcohol aqueous solution. The coating efficiency and weight fraction of the agglomerated particles were measured under various experimental conditions, and their dependencies on the frequency and the direction of vibration were investigated. The coating efficiency and the degree of the agglomeration among core particles correlated well with an index R. The index R was introduced to evaluate quantitatively the drying conditions in a fluidized bed. Application of vertical vibration on the fluidized bed lowered the coating efficiency somewhat, while it prevented agglomeration. From the experimental results it was confirmed that coating with high quality and high efficiency, where few agglomerates were produced and silica powder was utilized efficiently, was possible in a vibro-fluidized bed with adequate vibration frequency and orientation of the vibration vector