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

Deformation, orientation and bursting of microcapsules in simple shear flow: Wrinkling processes, tumbling and swinging motions
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简单剪切流中微胶囊的变形、取向和破裂:起皱过程、翻滚和摆动运动

DOI:
10.1088/1742-6596/602/1/012002
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发表时间:
2015
期刊:
Journal of Physics: Conference Series
影响因子:
--
通讯作者:
Rehage
Rehage
中科院分区:
--
文献类型:
--
作者:
Unverfehrt;Rehage

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在一系列实验中,我们研究了微胶囊在简单剪切流动中的变形和取向行为。对于大量的胶囊,我们观察到了由弯曲阻力、膜预应力或周围粘弹性壁材的力学不对称引起的折叠过程。对于非球形颗粒,其倾角存在周期性振荡。在低剪切率下,胶囊绕其轴线发生翻滚运动。在评估的剪切率下的摆动模式伴随着坦克踩踏运动,即围绕胶囊核心的膜旋转。在这两个众所周知的运动之间,我们还观察到了一种间歇性的状态。
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.
DOI: --
发表时间: 1998
期刊:
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