Effective UV-Induced Fluorescence Method for Investigating Interphase Mass Transfer of Single Bubble Rising in the Hele-Shaw Cell

Abstract

To investigate gas–liquid interphase mass transfer from a bubble to liquid in a thin gap, an experimental setup was established based on an UV-induced fluorescence method using acridine as the fluorescer. The acridine can quantify effectively the deposited CO2 in a liquid according to fluorescence intensity change. An image processing procedure was developed to obtain bubble contours and concentration wakes. The mean bubble rising velocities with respect to the bubble diameter were fitted, and a correlation was proposed. Nondimensional mass transfer flux was also calculated and compared with the results from classical Higbie and Frössling limiting models. The experimental method developed in this work is shown to have high sensitivity and low cost for characterizing the mass transfer of CO2 from a bubble to the surrounding liquid.