Abstract
AbstractIonic mass transfer coefficients between the wall of a 2.081 inch tube and liquid fluidized beds of lead glass, soda glass and lucite spheres have been measured using the diffusion‐controlled reduction of ferricyanide ion at a nickel cathode for porosities 0.90 to 0.45 and Schmidt numbers 580 to 2100.The developed fluidization mass transfer coefficient for 41 < DT/dp < 105 were correlated by iD E = 0.274 ReH−0.38 for 10 < ReH <1600 and by JD E = 0.455 ReH−0.44 for 16.7 < DT/dp < 27 and 50 < ReH < 3500. ReH is the hydraulic Reynolds number = dH up/μE and dH is DT E/[1 + (3/2) ((1–E)) (DT/dp)).The distinct effect of DT/dp ratio is attributed to wall effects and the non‐particulate behaviour of the fluidized bed for DT/dp < 27.Measurements in the open pipe and packed bed agreed very well with literature values. The packed bed gives highest mass transfer coefficients at given ReH.
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