Impinging-jet ozone bubble column modeling: Hydrodynamics, gas hold-up, bubble characteristics, and ozone mass transfer

A transient back flow cell model was used to model the hydrodynainic 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 as and liquid velocities, tic, (m.s(-1)) and u(L) (m.s(-1)), respectively, as follows: k(L)a = 55.58 center dot u(G)(1.26)center dot u(L)(0.08). The specific interfacial area, a (m(-1)), was determined as a = 3.61 X 103 u(G) (0.902)center dot u(L)(-0.038) by measuring the gas hold-up (epsilon(G) = 4.67 center dot u(G)(1.11)center dot u(L)(-0.05)) and Sauter mean diameter, d(s) (mm), of the bubbles (ds = 7.78 center dot u(G) (0.201) center dot u(L)(-0008)). The local mass transfer coefficient, k(L) (m.s(-1)), was then determined to be: kL = 15.40. u(G)(0.354) center dot u(L)(0.118).