Mass transfer from a vibrating bubble
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A stationary bubble was formed in tap water, conditioned to pH=8.5 in most of the cases, flowing at known velocities, mainly at 0.24 cm./sec. The gas bubble was vibrated by applied sonic energy. The mass transfer rates from vibrating and nonvibrating bubbles were measured, and also high speed photograph: of a vibrating bubble were taken to examine the bubble surface motion. The experimental results showed that the rate enhancements of the vibrating over non-vibrating bubbles, J, were found to depend strongly on the vibrational Peelet number, a^2f/v[infinity]D, and the bubble latitudinal vibrational mode, n. The data for the mono-dispersed bubble were correlated by the equation J = 0.024(Pev)^0.93(n)^1.39 For mixed vibrational modes of the bubbles of different sizes in their individual resonant frequencies, the results showed JR = 0.00935(af)^1.92 where is the mass transfer rate enhancement reduced to a reference liquid flow velocity, 0.24 cm./sec. Computer solution of the unsteady diffusion equation also tended to approach the experimental results.
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