Forces Acting on Submillimeter Spheres at the Air-Water Interface

The forces acting on submillimeter spheres at the air-water interface are investigated theoretically and experimentally. To calculate the capillary force acting on the sphere, an iterative method is used to determine the immersing position of the liquid interface on the sphere for a given distance....

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Bibliographic Details
Published in:Chinese physics letters 2015-11, Vol.32 (11), p.97-100
Main Author: 王乐锋 刘路 徐慧超 荣伟彬 孙立宁
Format: Article
Language:English
Subjects:
Capillarity
Electronics
Evaporation
Hysteresis
Iterative methods
Liquids
Mathematical analysis
Microspheres
亚毫米波
位置关系
作用力
尺度效应
毛细管力
电子天平
空气-水界面
迟滞现象
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Summary:The forces acting on submillimeter spheres at the air-water interface are investigated theoretically and experimentally. To calculate the capillary force acting on the sphere, an iterative method is used to determine the immersing position of the liquid interface on the sphere for a given distance. Then the total forces acting on the sphere are considered. The scaling effects of the net force acting on the sphere at the air-water interface are demonstrated. For the experiments, the force-position relationship of microspheres is measured with a precise electronic balance. The results show that the evaporation of the liquid in the container affects the measuring results greatly under ambient conditions. After considering the evaporation compensation, there is a great agree- ment between the theoretical and experimental results. Obvious hysteresis phenomena of the force-distance curve during the emersion processes are also observed and explained.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/11/116801