Single and Multiscale Bubble Motions Beneath an Inclined Downward-Facing Surface in the Aluminum Reduction Cell,Industrial & Engineering Chemistry Research

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Single and Multiscale Bubble Motions Beneath an Inclined Downward-Facing Surface in the Aluminum Reduction Cell
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-04-15 , DOI: 10.1021/acs.iecr.0c00793
Meijia Sun _{1,

2} , Roozbeh Mollaabbasi ₂ , Baokuan Li ₁ , Houshang Alamdari ₃ , Mario Fafard ₄ , Seyed Mohammad Taghavi ₂

Affiliation

Three-dimensional (3D) transient mathematical models are developed to explore the single and multiscale bubble dynamics beneath the inclined downward-facing surface of the anode in an aluminum reduction cell. The single bubble motion is traced by the volume of fluid (VOF) method. For the multiscale bubble, the discrete phase model (DPM) combined with the VOF approach is used to track the dispersed microbubbles’ trajectories and trace the continuous macrobubbles’ surfaces, respectively. A discrete-continuum transition (DCT) model is proposed to convert the dispersed bubbles to continuous ones and deal with the multiscale motions under the inclined anode surface. The predicted results of the sliding bubble velocity and the gas coverage are in a good agreement with the experimental data from the literature. On increasing the inclination angle, the detachment time of the single bubble from the nucleation site decreases while the sliding velocity increases. The gas coverage, bubble size, and thickness of multiscale bubbles decrease on increasing the inclination angle.

中文翻译：

铝电解槽中向下倾斜表面下方的单刻度和多刻度气泡运动

开发了三维（3D）瞬态数学模型，以探索铝还原池中阳极的向下倾斜表面下方的单尺度和多尺度气泡动力学。单个气泡运动通过流体体积（VOF）方法进行跟踪。对于多尺度气泡，离散相模型（DPM）与VOF方法相结合，分别用于跟踪分散的微气泡的轨迹和跟踪连续的大气泡的表面。提出了离散连续跃迁（DCT）模型，将分散的气泡转换为连续的气泡，并处理倾斜阳极表面下的多尺度运动。滑动气泡速度和气体覆盖率的预测结果与文献中的实验数据非常吻合。在增加倾斜角度时，气泡从成核位置的脱离时间减少，而滑动速度增加。气体覆盖率，气泡大小和多尺度气泡的厚度随倾斜角的增加而减小。

更新日期：2020-04-24

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