Reactive mass transfer of single bubbles in a turbulent flow chamber: Discussion on the effects of slippage and turbulence

The widely occurrence of gas-liquid mass transfer in the circulating flow is often involved but seldom discussed. Here, the mass transfer of single bubbles in a turbulent flow chamber was investigated. Force balance was performed to calculate the bubble slip velocity. In previous literatures, the effect of turbulence and slippage on the mass transfer was always discussed separately. In this work, we proposed that both slippage and turbulence contributed to gas-liquid mass transfer, and the mass transfer, in which turbulence had a more pronounced effect than slippage, increased with the increase of apparent liquid velocity in the chamber. A model, including two weighting coefficients and the models from Higbie, Frossling, and Lamont and Scott, was used for the comparison. The model can be used to describe k r in both quiescent and turbulent liquids as well as to express the mass transfer by considering both the effect of slippage and turbulence. (C) 2020 Elsevier Ltd. All rights reserved.