Chemical Engineering & Technology, Vol.38, No.11, 1947-1954, 2015
Influence of Bubble-Surface Contamination on Instantaneous Mass Transfer
The relationship between instantaneous mass transfer, bubble motions, and bubble-induced surrounding liquid motions is discussed on the basis of precise measurements in time and space. The influence of bubble-surface contamination on the above is considered quantitatively through comparison with those in a purified system. The bubble's surface motion, centroid motion, volume, and surface area were acquired precisely from moment to moment using two high-speed cameras and an own innovative image processing method. The dissolution process of CO2 was visualized via the laser-induced fluorescence/8-hydroxypyrene-1,3,6-trisulfonic acid (LIF/HPTS) method. Combining these experimental results carefully, the effects of the surfactant on the mass transfer, bubble motions, and vortex mechanism are discussed.