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Experimental study on the dynamics and mass transfer of CO2 bubbles rising in viscoelastic fluids.
International Journal of Multiphase Flow ( IF 3.8 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.ijmultiphaseflow.2020.103539
Xiaofei Xu , Victus Kordorwu , Zhi Li , Fengxia Liu , Wei Wei , Zhijun Liu

Abstract Single CO2 bubbles rising in quiescent viscoelastic polyacrylamide (PAA) aqueous solutions of different weight percentages (wt. %) were studied to obtain insight into the impact of fluid elasticity on the rising dynamics of dissolving bubbles. A random abrupt fall and rise in velocity was observed as the bubble velocity gradually and progressively decreased throughout the journey. This is the first time this observation is reported. In the most viscoelastic medium in which this phenomenon occurred, CO2 bubbles decreased in diameter by at least 20% over 1m of height. Mass transfer analysis of the system indicated significant reduction of mass transfer coefficient with increase in weight percentage of the polymer solution. Comparison of experimental mass transfer coefficients with predictions for mobile and immobile gas-liquid interfaces were consistent with theoretical predictions from Higbie's and Frossling's equations respectively. The rising dynamics was correlated using dimensional analysis, and the prediction by a developed empirical correlation considering the combined effect of fluid elasticity and shear-thinning property showed a satisfactory agreement with experimental data in all liquids studied.

中文翻译:

CO2气泡在粘弹性流体中上升的动力学和传质实验研究。

摘要 研究了在不同重量百分比 (wt. %) 的静态粘弹性聚丙烯酰胺 (PAA) 水溶液中上升的单个 CO2 气泡,以深入了解流体弹性对溶解气泡上升动力学的影响。随着气泡速度在整个旅程中逐渐逐渐降低,观察到速度的随机突然下降和上升。这是第一次报告这一观察结果。在发生这种现象的最具粘弹性的介质中,CO2 气泡的直径在 1m 的高度上至少减少了 20%。系统的传质分析表明,随着聚合物溶液重量百分比的增加,传质系数显着降低。实验传质系数与移动和固定气液界面预测的比较分别与 Higbie 和 Frossling 方程的理论预测一致。上升动力学使用量纲分析相关联,并且通过考虑到流体弹性和剪切稀化特性的组合效应的开发的经验相关性进行的预测与所有研究的液体的实验数据显示出令人满意的一致性。
更新日期:2021-02-01
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