Impinging-Jet Ozone Bubble Column Modeling:Hydrodynamics,Gas Hold-up,Bubble Characteristics,and Ozone Mass Transfer

摘要

A transient back flow cell model was used to model the hydrodynamic behaviour of an impinging-jet ozone bubble column.A steady-state back flow cell model was developed to analyze the dissolved ozone concentration profiles measured in the bubble column.The column-average overall mass transfer coefficient,k_L~a(s~(-1)),was found to be dependent on the superficial gas and liquid velocities,u_G(m.s~(-1))and u_L(m.s~(-1)),respectively,as follows:k_L~a= 55.58·u_G~(1.26)·u_L~(0.08).The specific interfacial area,a(m~(-1)),was determined as a= 3.61X10~3·u_G~(0.902)·u_L~(-0.038)by measuring the gas hold-up(~(epsilon)G= 4.67·u_G~(1.11)·u_L~~(0.05))and Sauter mean diameter,d_s(mm),of the bubbles(ds= 7.78·u_G~(0.207)·u_L~(-0.008)).The local mass transfer coefficient,k_L(m.s~(-1)),was then determined to be:k_L= 15.40·u_G~(0.354)·u_L~(0.118).