Liquid Films Theory, Experiments and Industrial Applications (cancelled)
October 14, 2002 — October 18, 2002
Coordinator:
- Nuri Aksel (University of Bayreuth, Bayreuth, Germany)
Liquid films occur in various technical processes, in nature and in everyday life, such as coating, lubrication, painting, printing, i.e. coating of semi-conductors and magnetic tapes. Beyond practical importance, liquid films are of great fundamental interest to mathematicians, physicists and engineers. They show a broad variety of physical phenomena, such as instabilities, rupture, wave propagation and so on.
The aim of the course is to present an overview of the state-of-the-art on liquid films, including theory, experiment and practical industrial applications. Beginning with the governing equations and the associated boundary conditions of film flows, the lubrication equations will be presented. Influence of the sidewalls and bottom topographies will be discussed theoretically and experimentally. Hereby, the capillarity is of fundamental importance not only for film flows but also for spreading. It gives rise to interesting static and dynamic phenomena at interphases which often cause problems in practical applications. Viscous fingering and dry patches for example may restrict the quality of painting.
Surface tension gradients provoked by temperature or concentration gradients modify the film flow. Such concentration gradients may occur during evaporation and condensation which can lead to wetting and dewetting. In the case of viscous fingering, evaporation is responsible for example for the tears of wine. All the above-mentioned phenomena can be observed in Newtonian liquids. However, in most applications we face non-Newtonian liquids. The non-Newtonian properties modify the flow behaviour of liquid films.
Finally, practical applications from the industrial point of view will be given to show and to narrow the gap between the academic research and industrial application.
The course is addressed to: postgraduates, PhD. students, postdocs and research engineers in physics, mechanical and chemical engineering.