Mass Transfer from Suspended Sphere in Presence of Inert Multi-Particulate Fluidised Solid

Abstract

Mass transfer from naphthalene spheres in the presence of inert fluidised particles of different size fraction has been studied. The parameters considered in the present study include effect of particle Reynolds number Re p , suspended sphere diameter, bed porosity in mass transfer, and effect of inert fluidised particle diameter on mass transfer coefficient. Inert fluidised particles, spherical in nature and having specific gravity 1.4 with size ranging from 0.2923667 to 0.6276975 mm were used. The diameter of the suspended naphthalene spheres varied from 17 to 31 mm. The Re p varied from 11 to 70 with varying air velocity and fluidised bed porosity varied from 0.48 to 0.73. Mass transfer coefficient was found to vary from 3.6 ¥ 10− 5 to 2.4 ¥ 10− 4. The corresponding mass transfer factor varied from 7.88 ¥ 10− 7 to 8.92 ¥ 10− 6. The effect of different parameters, which affect the rate of mass transfer from suspended spheres in the presence of inert fluidised particles, were co-related in a new form of mass transfer factor J D ′ which is the function of mass transfer factor J D , naphthalene diameter D nap and inert particle diameter D pi . A new correlation was established with J D ′ and modified Reynolds number.