Anisotropic Stokes Drag and Dynamic Lift on Spheres Sedimenting in a Nematic Liquid Crystal

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• 作者：Joel B. Rovner ; Daniel H. Reich ; Robert L. Leheny
• 刊名：Langmuir
• 出版年：2013
• 出版时间：February 19, 2013
• 年：2013
• 卷：29
• 期：7
• 页码：2104-2107
• 全文大小：220K
• 年卷期：v.29,no.7(February 19, 2013)
• ISSN：1520-5827

文摘

The motion of silica spheres with homeotropic anchoring sedimenting within nematic liquid crystal 4-cyano-4鈥?pentylbiphenyl (5CB) has been studied at low Ericksen number. The magnitude of the spheres鈥?velocity depends on the angle 胃 between the far-field nematic director and the gravitational force, indicating an anisotropic Stokes drag. When the director is oriented at an oblique angle to the gravitational force, the velocity also acquires a component normal to the force, demonstrating the existence of a lift force generated by the fluid. The magnitude and direction of the velocity as functions of 胃 quantitatively obey theoretically predicted forms.