大学化学 >> 2018, Vol. 33 >> Issue (10): 110-113.doi: 10.3866/PKU.DXHX201803044

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毛细管口气泡的曲率半径和附加压力变化

谢治辉*()   

  • 收稿日期:2018-03-21 发布日期:2018-11-01
  • 通讯作者: 谢治辉 E-mail:zhxie@cwnu.edu.cn

Evolution of Radius of Curvature and Excess Pressure of a Bubble at the End of Capillary

Zhihui XIE*()   

  • Received:2018-03-21 Published:2018-11-01
  • Contact: Zhihui XIE E-mail:zhxie@cwnu.edu.cn

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摘要：

通过直接绘制气泡形成过程中弯曲表面关键状态的形状示意图，得到了曲率半径随时间变化的关系曲线。利用该曲线有助于加深学生对最大泡压法测表面张力实验中曲率半径和附加压力变化的理解，同时该曲线也可用于解析一些与附加压力有关的习题。

关键词: 毛细管, 曲率半径, 附加压力, 表面张力

Abstract:

The profiles of the curved surface at critical status during formation of a bubble are drawn schematically, and the dependence of the radius of curvature on time is obtained in this work. The curve is useful for the students to better understand the evolution of radius of curvature and excess pressure in the laboratory experiment of surface tension measurements by the bubble pressure method, and helpful to interpret the exercises regarding excess pressure.

Key words: Capillary, Radius of curvature, Excess pressure, Surface tension