Konan N'dri Arthur, Rosenbaum Eilis, Massoudi Mehrdad
National Energy Technology Laboratory, 3610 Collins Ferry Road, Morgantown, WV 26507, USA.
NETL Support Contractor, 3610 Collins Ferry Road, Morgantown, WV 26507, USA.
Materials (Basel). 2023 Sep 27;16(19):6433. doi: 10.3390/ma16196433.
The dynamics of air (gas) bubbles in a column of cement slurry is examined numerically. The air injected at the bottom of a laboratory-scale column through a porous distributor plate spatially distributes and migrates as a swarm of bubbles throughout the slurry toward the freeboard. The two-phase system of the cement slurry and the air bubbles is modeled using the conservation equations of mass and linear momentum in the framework of the volume-of-fluid (VOF) approach. The cement slurry is modeled using the Herschel-Bulkley and Bingham fluid models. Results show that the mean Sauter diameter and the mean rise velocity of the bubbles decrease with the gas flow rate. Meanwhile, it is found that the rising of the bubbles is controlled by breakup events, along with relatively weak path instabilities of the bubbles resulting in relatively straight trajectories, independent of the gas flow rate. The extent of the yielded region appears larger for the Herschel-Bulkley model compared to the Bingham fluid model (by approximately 10%).
对水泥浆柱中空气（气体）气泡的动力学进行了数值研究。通过多孔分布板在实验室规模的柱体底部注入的空气，作为一群气泡在整个浆液中空间分布并向自由液面迁移。在流体体积（VOF）方法的框架内，使用质量和线性动量守恒方程对水泥浆和气泡的两相系统进行建模。水泥浆采用赫谢尔-布尔克利和宾汉流体模型进行建模。结果表明，气泡的平均索特直径和平均上升速度随气体流量的增加而减小。同时，发现气泡的上升受破裂事件控制，气泡的路径不稳定性相对较弱，导致轨迹相对笔直，且与气体流量无关。与宾汉流体模型相比，赫谢尔-布尔克利模型的屈服区域范围似乎更大（约大10%）。
