PHYSICS AND MATHEMATICS

On the profile of a liquid drop in touch with the substrate

Yu. M. Zaslavsky

Institute of applied physics Russian academy of science

Abstract: Vertical cross sections of a liquid drop spread over a rigid flat wettable substrate and the drop hanging from the substrate are studied theoretically. The gas-liquid boundary analyzed in equilibrium of the surface tension forces and the gravity forces is analyzed. The radius of spreading of a liquid drop as a function of the contact angle is considered for both cases of the upper and lower location of the drop.

Keywords: section profile, liquid drop, surface tension, contact angle, rigid substrate.