化工进展2016，Vol.35Issue(10)：3049-3056,8.DOI:10.16085/j.issn.1000-6613.2016.10.006
竖直上升气液泡状流数学模型封闭的研究
Comparative investigation on closure models for the simulation of vertical gas-liquid bubbly upflow
摘要
Abstract
Gas-liquid upflow in vertical pipes was widely used in the phase change heat transfer and nuclear reactors. In this paper,the Euler-Euler two-fluid model was applied in the simulation of the gas-liquid upflow with the emphasis on the selections of the closure models. The lift force,wall lubrication force,turbulent dispersion force and bubble induced turbulence(BIT) were studied at a superficial liquid velocity 0.45m/s and superficial gas velocities,0.015m/s and 0.1m/s,respectively. The simulation results showed that:①At low superficial gas velocity,the near wall gas holdup can be optimized with both the lift force and wall lubrication force taken into account. The bubbles reached a relative balance under the effect of this two forces with the result of wall peak of gas fraction and the reasonable simulated liquid velocity;The effect of BIT can be negligible at low superficial gas velocity.②At high superficial gas velocity bubbly flows,the influence of BIT on the simulation results of gas-liquid two phase flow was evident. The simulation results can be improved with the turbulence dissipation source term included,and Troshko model prevailed over Sato model in describing the effect of bubble induced turbulence on the liquid turbulence.③At high superficial gas velocity,the wallpeak of gas holdup occurred with the lift force included,then the peak value can be reduced after the turbulent dispersion force taken into account. While the issue of wall peak still can’t be solved, indicating that turbulence dispersion force was not strong enough to overcome the lift force.关键词
气-液两相流/泡状流/气泡诱导湍流/升力/壁面润滑力Key words
gas-liquid two phase flow/bubbly flow/bubble induced turbulence(BIT)/lift force/wall lubrication force分类
数理科学引用本文复制引用
周强,郭晓峰,李军,王腾,陈彩霞..竖直上升气液泡状流数学模型封闭的研究[J].化工进展,2016,35(10):3049-3056,8.基金项目
国家自然科学基金项目（21276085）。 （）
