The ring-sheared drop is a module for the International Space Station to study sheared fluid interfaces and their influence on amyloid fibril formation. A 2.54-cm diameter drop is constrained by a stationary sharp-edged ring at some latitude and sheared by the rotation of another ring in the other hemisphere. Shearing motion is conveyed primarily by the action of surface shear viscosity. Here, we simulate microgravity in the laboratory using a density-matched liquid surrounding the drop. Upon shearing, the drop's deformation away from spherical is found to be a result of viscous and inertial forces balanced against the capillary force. We also present evidence that the deformation increases with increasing surface shear viscosity.

中文翻译：

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环形剪切液滴中的模拟微重力。

环形剪切滴是国际空间站研究剪切的流体界面及其对淀粉样蛋白原纤维形成的影响的模块。直径下降2.54厘米时，在某个纬度上会受到固定的锐边环的约束，而在另一个半球中，另一个环的旋转会对其产生剪切作用。剪切运动主要通过表面剪切粘度的作用来传递。在这里，我们使用液滴周围的密度匹配液体在实验室中模拟微重力。剪切后，发现液滴的变形远离球形，是粘性和惯性力与毛细力平衡的结果。我们还提供证据表明，变形随着表面剪切粘度的增加而增加。