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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Published inChinese physics letters Vol. 32; no. 11; pp. 97 - 100
Main Author 王乐锋 刘路 徐慧超 荣伟彬 孙立宁
Format Journal Article
LanguageEnglish
Published 01.11.2015
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
Online AccessGet full text
ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/32/11/116801

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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.
Bibliography: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.
WANG Le-Feng, LIU Lu,XU Hui-Chao, RONG Wei-Bin, SUN Li-Ning（ State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150080）
11-1959/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/11/116801