文献类型：期刊文献

英文题名：A numerical study of two identical CO2 bubbles rising side by side in water coupled with mass transfer

作者：Zeng, Lexiang[1];Pei, Donghao[1];Cao, Jun[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2024

卷号：46

期号：1

起止页码：9512

外文期刊名：ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS

收录：;EI(收录号：20243016743531);WOS:【SCI-EXPANDED(收录号:WOS:001273840300001)】；

基金：This research work is supported by the Natural Science Foundation of Shanghai under Grant No. [20ZR1413200].

语种：英文

外文关键词：CO2 bubbles; mass transfer; coalescence; numerical simulation; liquid viscosity

摘要：In contrast to the relatively straightforward rising dynamics of single bubbles, the behavior of multiple bubbles involves a more intricate interplay of flow field dynamics, trajectory patterns, morphological changes, and mass transfer phenomena. To reveal the coalescence characteristics and mass transfer effects of CO2 bubbles during the rising process, this study developed a coupled mass transfer numerical model for bubbles. The Volume of Fluid (VOF) method was used in combination with a mass transfer code for solving the model. The effects of bubble pair initial spacing and liquid viscosity on the coalescence and mass transfer were discussed. The numerical simulation results show that as the initial distance between the two bubbles decreases, the interaction force between the bubbles increases, and the possibility of bubble coalescence increases, the coalescence behavior reduces the contact area and thus decreases the amount of CO2 dissolved about 24.07%. When the initial viscosity of the liquid phase is low, there is an oscillation in the bubble velocity, and the two bubbles tend to merge. As the initial viscosity of the liquid phase increases, resistance increases, causing a decrease in bubble velocity. Consequently, the path of bubble ascent shifts from "approach-repulsion-approach" to "continuous repulsion." The viscous resistance reduces the gas-liquid contact area, resulting in a corresponding decrease in the mass transfer rate, the dissolution amount of carbon dioxide decreased by approximately 24.42% in this case. The exploration of coupled fluid dynamics and mass transfer phenomena at the multi-bubble scale holds paramount importance in guiding the design and exploration of gas-liquid two-phase flow systems.