Evolution of liquid/solid contact area of a drop impinging on a solid surface

• Published in: International journal of heat and mass transfer 2000-05, Vol.43 (9), p.1673-1677
• Main Authors: Fujimoto, Hitoshi, Shiraishi, Hiroaki, Hatta, Natsuo
• Format: Article
• Language: English
• Subjects: Air entrapment; Bubble; Bubbles (in fluids); Collision behavior of liquid drops with a surface; Condensed matter: structure, mechanical and thermal properties; Drops and bubbles; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Liquid/solid direct contact; Nonhomogeneous flows; Other nonelectronic properties; Phase interfaces; Photography; Physics; Solid surfaces and solid-solid interfaces; Solid-fluid interfaces; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Visualization
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/S0017-9310(99)00234-3

Time evolution of liquid/solid contact area of impacting drop on a solid surface has been investigated experimentally by means of a flash photographic method. The case has been treated where water drops with about 2.4 mm in diameter impinge vertically on a horizontal smooth surface. It has been found that a liquid drop contacts the surface with a ring-shape at the moment of collision. Inside this ring-shaped liquid/solid contact area, air is entrapped between the liquid and the solid surface. Liquid does not contact the surface there. The noncontact area decreases sharply with time, and then becomes constant. The physical phenomena occurring at the liquid/solid interface have been discussed from an experimental point of view.