A lid-driven cavity flow of kaolinite suspension is investigated using a numerical approach. The suspension with a kaolinite concentration in the range of 15–28.5wt% is modeled using Bingham–Papanastasiou approach. The cavity is of a rectangular shape and has different aspect (height-to-width) ratios, that is, 0.5 (shallow cavity), 1 (square cavity), and 2 (deep cavity). The width-based Reynolds number is in the range of 40–400, corresponding to a Bingham number in the range of 0.16–28.8. Various flow characteristics such as the streamline pattern, the velocity distribution, the formation of unyielded/rigid zones, and the vortex structure are presented and discussed. Results show that the static rigid zones are significantly larger for greater aspect ratio. Unlike the shallow and square cavities in which only one primary vortex is observed, in the deep cavity two primary vortices rotating in the opposite directions are formed. In addition, the upper part of the deep cavity behaves like a square cavity, while its lower part is mostly a rigid zone.

使用数值方法研究了高岭石悬浮液的盖驱动腔流动。使用Bingham-Papanastasiou方法对高岭石浓度在15-28.5wt％范围内的悬浮液进行建模。空腔为矩形，并且具有不同的纵横比（高宽比），即0.5（浅空腔），1（方形空腔）和2（深空腔）。基于宽度的雷诺数在40–400的范围内，对应于Bingham数在0.16–28.8的范围内。提出并讨论了各种流动特性，例如流线型式，速度分布，未屈服/刚性区的形成以及涡旋结构。结果表明，静态刚性区域的纵横比更大。不同于仅观察到一个初级涡旋的浅腔和方腔，在深腔中，形成了两个沿相反方向旋转的主旋涡。另外，深腔的上部表现得像方腔，而其下部大部分是刚性区域。