关于固体表面上液体球冠的平衡条件问题——兼评“冷凝器壁面滴状冷凝的热力学机理及最佳接触角”等文章

On the equilibrium conditions for a spherical-cap liquid drop on a solid surface——Also comments on"Thermodynamic mechanism for the condensation of liquid drops on the condenser surface"etc.

对于第一类液滴(尺度远大于界面层的厚度),无论是远离固体壁面的液体球或附着在壁面上的球冠,其内外压力差(简称"附加压力")均适用经典Laplace公式,并且特别对球冠情况给出了一种新的整体性证明.还澄清有关争论:指出[曹治党、郭愚1999物理学报481823]一文对附壁面第一类液体球冠所推导出的附加压力与接触角有关的公式是错误的,而[闵敬春2002物理学报512730]是正确的。

For a liquid drop of first kind（with the size much bigger than the interface thickness）,whether on or far away from a solid surface,it is proved that the classical Laplace equation is valid and the related arguments are clarified.The formula of additional pressure for the liquid drop of the first kind dependent on contact angle,given in Ref.[Cao Z J,Guo Y 1999 Acta Phys.Sin.48 1823]is wrong,the comment of Ref.[Min J C 2002 Acta Phys.Sin.51 2730]is correct.