Flow simulation and topological rearrangements of ordered foams

2nd International Conference on Mathematical Modeling in Physical Sciences 2013

物理学;数学

Ortiz, J.S. Espinoza^1 ; Belich, H.^2

Departamento de Física, Universidade Federal de Goiás, Catalão, GO 75704-020, Brazil^1

Depto de Física e Química, Universidade Federal Do Espírito Santo, ES 29060-900, Brazil^2

关键词: Cellular potts models;    Critical behavior;    Driving forces;    Herschel-Bulkley;    Mono-dispersed;    Ordered foams;    Rate response;    Topological rearrangements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/490/1/012056/pdf
DOI  :  10.1088/1742-6596/490/1/012056

来源: IOP

【 摘 要 】

Flow through a narrow bent channel may induce topological rearrangements in a two-dimensional monodispersed dry liquid foam. We use the Cellular Potts Model to simulate a foam under a variable driving force in order to investigate the strain-rate response from these rearrangements. We observe a set of foams' behaviors ranging from elastic, viscoelastic to fluid regime. Bubble's topological rearrangements are localized and their cumulative rearrangements change linearly with time, thus non avalanches critical behavior is found. The strain-rate affects the rate of topological rearrangements, its dependence on the drag force is nonlinear, obeying a Herschel-Bulkley like relationship below the foam's flow point.