Numerical modelling of foam Couette flows
Numerical modelling of foam Couette flows
复制标题
泡沫库埃特流动的数值模拟
DOI：
10.1140/epje/i2009-10445-3
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
François Graner
中科院分区：
文献类型：
--
作者：
I. Cheddadi;P. Saramito;C. Raufaste;P. Marmottant;François Graner
我们提出了一个数值模拟的基础上张量弹粘塑性模型，包括粘性阻力和比较它的实验测量两个玻璃板之间的二维圆柱Couette几何形状，无论是在静止和瞬态制度的液体泡沫被困。该模型的主要特点是弹性到塑性屈服应力和粘弹性以上。数值建模基于一小套标准材料参数，可以充分表征。剪切局部化以及精细的瞬态观测再现，并发现与实验测量结果吻合良好。塑性似乎是流动局部化的基本机制。本方法可以从液体泡沫扩展到类似的材料，如乳液、胶体或表现出局部化的湿颗粒材料。
We present a numerical simulation based on a tensorial elastoviscoplastic model that includes a viscous drag and compare it to experimental measurements on liquid foams trapped between two glass plates in a bidimensional cylindrical Couette geometry, both in stationary and transient regimes. The main features of the model are elasticity up to a plastic yield stress and viscoelasticity above. The numerical modelling bases on a small set of standard material parameters that could be fully characterised. Shear localisation as well as fine transient observations are reproduced and are found to be in good agreement with experimental measurements. The plasticity appears to be the fundamental mechanism of the localisation of the flow. The present approach can be extended from liquid foams to similar materials such as emulsions, colloids or wet granular materials that exhibit localisation.