Contact angle of spherical drops inside a smooth and homogeneous cylindrical capillary with hemispherical head

Abstract

To investigate the wettability of spherical drops in a smooth and homogeneous cylindrical capillary with hemispherical head, based on Gibbs’s method of dividing surface and Rusanov’s concept of dividing line, the contact angle of spherical droplets has been successfully derived considering the effects of the line tension. Additionally, under the condition of ignoring the line tension, the equation describing the contact angle is simplified as the classical Young equation.