论文标题
粘弹性流体的径向位移期间的侧向分支图案，合并和稳定的界面
Side branched patterns, coalescence and stable interfaces during radial displacement of a viscoelastic fluid
论文作者
论文摘要
我们探索界面的不稳定性，当牛顿液（甘油 - 水混合物，内液）中置换辐射hea毛毛透透中的粘弹性流体（密集的玉米淀粉悬浮液，外流体）时产生的界面不稳定性。随着内部流体和外部流体的粘度之比增加，侧支界面图案被更稳定的界面所取代，这些界面显示出比例的生长和手指合并。我们将平均手指间距与界面不稳定性的最优势波长相关联，该波长是使用数学模型计算出的，该数学模型说明了可混杂的Hele-Shaw位移中的粘性指法。关于粘度比在手指间距上的作用的模型预测与实验观测密切一致。我们的研究可以深入了解外流体对界面模式的形态和生长的粘弹性的重要贡献。
We explore the interfacial instability that results when a Newtonian fluid (a glycerol-water mixture, inner fluid) displaces a viscoelastic fluid (a dense cornstarch suspension, outer fluid) in a radial Hele-Shaw cell. As the ratio of viscosities of the inner and outer fluids is increased, side branched interfacial patterns are replaced by more stable interfaces that display proportionate growth and finger coalescence. We correlate the average finger spacing with the most dominant wavelength of interfacial instability, computed using a mathematical model that accounts for viscous fingering in miscible Hele-Shaw displacements. The model predictions on the role of viscosity ratio on finger spacing are in close agreement with the experimental observations. Our study lends insight into the significant contribution of the viscoelasticity of the outer fluid on the morphology and growth of interfacial patterns.
