Deformation, orientation and bursting of microcapsules in simple shear flow: Wrinkling processes, tumbling and swinging motions

1st International Conference on Rheology and Modeling of Materials

物理学;材料科学

Unverfehrt, A.^1 ; Koleva, I.^2 ; Rehage, H.^1

Technical University Dortmund, Department of Physical Chemistry, Germany^1

Phoenix CBS GmbH, Bad Blankenburg, Germany^2

关键词: Bending resistance;    Folding process;    Inclination angles;    Nonspherical particle;    Periodic oscillation;    Simple shear flow;    Swinging motions;    Tank-treading motion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/602/1/012002/pdf
DOI  :  10.1088/1742-6596/602/1/012002

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In a series of experiments we studied the deformation and orientation behaviour of microcapsules in simple shear flow. For a large number of capsules we observed folding processes which were induced by the bending resistance, by membrane pre-stresses or the mechanical asymmetry of the surrounding viscoelastic wall materials. Periodic oscillations of the inclination angle were detected for non-spherical particles. At low shear rates a tumbling motion occurred in which the capsule turned around its axis. A swinging mode at evaluated shear rates was accompanied by tank-treading motions, a rotation of the membrane around the capsule core. Between these two well-known motions we also observed an intermittent regime.