In order to reveal the interaction mechanism between the rising behavior of CO2 gas bubbles and the mass transfer process,the coupling of bubble flow and mass transfer was achieved through the VOF multiphase flow model combined with a custom program.Numerical simulation results show that during the process of CO2 gas bubble rising,phenomena such as coalescence,breakup,free rising and repulsion occur.The bubble wake experiences three stages:symmetrical detachment,transitional state and periodic detachment.Factors such as initial bubble spacing,initial bubble size and liquid phase properties collectively influence the movement and mass transfer process of multiple bubbles.When the initial spacing is small,bubbles are more likely to coalesce,which reduces the gas-liquid contact area and is not conducive to mass transfer.When the initial diameter is small,the bubble movement is more unstable and the residence time is longer,which can promote gas-liquid mass transfer.The greater the liquid viscosity,the greater the resistance,which inhibits the diffusion of the gas phase in the wake and is not conducive to mass transfer.
关键词
CO2气泡/气液两相流/传质/数值模拟/聚并
Key words
CO2 bubble/gas-liquid two-phase flow/mass transfer/numerical simulation/coalescence
万方数据