Spreading of Annular Droplets on a Horizontal Fiber

Spreading of Annular Droplets on a Horizontal Fiber
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环形液滴在水平光纤上的传播

DOI:
10.1007/s12217-017-9581-6
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发表时间:
2018-05
期刊:
Microgravity-Science and Technology
影响因子:
--
通讯作者:
Rong Liu
Rong Liu
中科院分区:
其他
文献类型:
--
作者:
Xue Chen;Zijing Ding;Rong Liu

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本文研究了水平光纤上的环形液滴。分析了液滴的静态和动态扩展过程。从能量变分原理出发,推导出描述静态液滴轮廓的完整模型。为了研究液滴的动态扩展,我们推导了一个润滑模型,并通过全模型进行了验证。这表明该润滑模型对细液滴是有效的。静态液滴的结果表明,当纤维半径很小时,液滴趋于球形;如果纤维半径很大,液滴接近抛物线轮廓。此外,时间演化研究进行了调查的动态扩展的液滴。当纤维半径较小时,液滴可以分裂成小液滴或收缩成尖锐形状。对于大的纤维半径,液滴扩展到稳定的轮廓。此外,液体粘度被发现延迟液滴的变形和接触线的运动。
This paper investigates an annular droplet on a horizontal fiber. The static state and the dynamic spreading process of the droplet is analyzed. A full model describing the profile of a static droplet is derived from the energy variation principle. To study the dynamical spreading of the droplet, we derive a lubrication model which is verified by the full model. It indicates that the lubrication model is valid for a thin droplet. Results of the static droplet reveal that, when the fiber radius is very small, the droplet tends to have a spherical shape; if the fiber radius is very large, the droplet approaches to a parabolic profile. Furthermore, the time-evolution study is carried out to investigate the dynamical spreading of the droplet. It is highlighted that when the fiber radius is small, the droplet can breakup into small droplets or contract into a sharp shape. For a large fiber radius, the droplet spreads to a steady profile. In addition, the liquid viscosity is found to retard the deformation of the droplet and the motion of the contact lines.
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