Mass transfer from carbon dioxide bubbles rising in water

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Abstract
Continuous phase mass transfer coefficients have been measured for carbon dioxide bubbles rising in water. A procedure was developed for systematically studying the effect of the three variables: bubble volume, formation frequency, and seal height.The mass transfer coefficient was independent of bubble volume, increased 35% with a ten‐fold increase in frequency and varied only 8% over a 30 cm. range in seal height. The data, extrapolated to zero frequency, agreed well with the single bubble study of Hammerton and Garner. The Higbie equation predicted results very close to those obtained here but was not too successful in explaining the effect of bubble size or frequency.The average mass transfer coefficient is about four times that for a solid particle as reported by Akselrud; this enhancement is attributed to internal circulation. Surface absorption rates were determined as a function of bubble frequency. New data has also been presented on the factors which control frequency, velocity of rise, and bubble shape. A partial correlation was developed relating bubble frequency to chamber volume.

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