论文标题
通过老化粘弹性悬浮液的径向位移形成的界面模式的生长动力学
Growth kinetics of interfacial patterns formed by the radial displacement of an aging viscoelastic suspension
论文作者
论文摘要
当软玻璃状胶体悬浮液被径向Hele-shaw几何形状中的牛顿流体移动时，在界面上发展的模式形态是由前者的复杂流变学决定的。我们在较早的工作中报道了[Palak，V。R. S. Parmar，D。Saha和R. Bandyopadhyay，JCIS Open，6（2022）100047]，可以通过控制流离失所的悬浮液的弹性来形成一系列界面模式。有趣的是，所有不同的形态特征都可以从其面积比例来区分，该特征定义为完全发达的模式所占据的区域的比率和包围它的最小圆圈。在对这项较早工作的重大进展中，我们在这里表明，对时空模式增长的系统研究可以揭示有关模式选择机制的重要信息。我们分析了模式的时间进化，以揭示其生长机制与完全发达的形态之间的有趣相关性。我们认为，这种系统识别对衰老的粘层粘土悬浮液和牛顿流体之间界面处的图案生长的独特时间特征可用于预测和抑制泥浆和水泥泥浆位移中界面不稳定性的发作和进化。
When a soft glassy colloidal suspension is displaced by a Newtonian fluid in a radial Hele-Shaw geometry, the pattern morphology that develops at the interface is determined by the complex rheology of the former. We had reported in an earlier work [Palak, V. R. S. Parmar, D. Saha and R. Bandyopadhyay, JCIS Open, 6 (2022) 100047] that a range of interfacial patterns can be formed by controlling the elasticity of the displaced suspension, the flow rate of the displacing fluid and the interfacial tension of the fluid pair. Interestingly, all the different morphological features can be distinguished in terms of their areal ratios, defined as the ratio of the areas occupied by the fully-developed pattern and the smallest circle enclosing it. In a significant advance to this earlier work, we show here that a systematic study of spatio-temporal pattern growth can reveal important information about pattern selection mechanisms. We analyse the time-evolution of the patterns to reveal interesting correlations between their growth mechanisms and fully-developed morphologies. We believe that such systematic identification of the unique temporal features characterising pattern growth at the interface between an aging viscoelastic clay suspension and a Newtonian fluid can be useful in predicting and suppressing the onset and evolution of interfacial instabilities in the displacement of mud and cement slurries.
