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首页> 外文期刊>International Journal of Heat and Mass Transfer >CFD simulations of hydrodynamic characteristics in a gas-liquid vertical upward slug flow
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CFD simulations of hydrodynamic characteristics in a gas-liquid vertical upward slug flow

机译：气液垂直向上段塞流中水动力特性的CFD模拟

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Computational fluid dynamics (CFD) simulations are conducted using the volume-of-fluid (VOF) method to investigate the hydro-dynamic characteristics of slug flow and the mechanism of slug flow induced CO_2 corrosion. The hydrodynamic characteristics are significantly affected by the viscous, interfacial, and inertial forces. In inertia dominated flows, the velocity of fully developed falling liquid film is increased with increased Taylor bubble rising velocity. The developing falling liquid film is formed at about the length of 0.5 diameter from the Taylor bubble nose, the fully developed falling liquid film is reached at about the length of 1.5-2.1 diameter from the Taylor bubble nose. The average mass transfer coefficient in the falling liquid film is always higher than that in the Taylor bubble wake zone. The iron ion near wall mass transfer coefficient is higher than that of hydrogen ion. The wall shear stress is increased with increased Taylor bubble rising velocity in fully developed falling liquid film zone, and the wall shear stress has a large fluctuation due to the chaotic and turbulent vortexes in Taylor bubble wake zone. The formation and the damage mechanism of the corrosion product scale are proposed for the gas-liquid two-phase vertical upward slug flow induced CO_2 corrosion. It is found that the wall shear stress of upward gas-liquid slug flow is alternate with high frequency, which is the key factor resulting in the corrosion product scale fatigue cracking. The CFD simulation results are in satisfactory agreement with previous experimental data and models available in literature.
机译：利用流体体积（VOF）方法进行了计算流体动力学（CFD）模拟，以研究团状流的水动力特性以及团状流引起的CO_2腐蚀的机理。流体动力特性受到粘性，界面和惯性力的显着影响。在惯性支配的流动中，完全发展的下降液膜的速度随着泰勒气泡上升速度的增加而增加。从泰勒气泡鼻形成约0.5直径的长度的显影下落液膜，从泰勒气泡鼻约1.5-2.1直径的长度达到完全显影的液滴液。下落的液膜中的平均传质系数始终高于泰勒气泡唤醒区中的平均传质系数。铁离子在壁附近的传质系数高于氢离子。在完全展开的下降液膜区中，壁剪切应力随着泰勒气泡上升速度的增加而增加，并且由于泰勒气泡尾流区中的混沌和湍流涡旋，壁剪切应力具有较大的波动。提出了气液两相垂直向上段塞流诱发CO_2腐蚀的腐蚀产物垢的形成及破坏机理。研究发现，气液弹团向上流动的壁面剪应力具有较高的频率交替变化，这是导致腐蚀产物垢疲劳裂纹的关键因素。 CFD仿真结果与以前的实验数据和文献中的模型令人满意。

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