DROPS AT REST ON A TILTED PLANE

A liquid drop on a tilted plate can remain at rest, provided that an h ysteresis for the contact angle exists. We examine in this paper the c ase of small contact angle hysteresis, for which the drops are found t o be nearly spherical caps, despite the slope. We derive in particular the condition (both in angle and hysteresis) under which the drop rem ains stuck on the surface: a simple model is proposed and compared wit h experimental data.