ISSN Online: 2377-424X
International Heat Transfer Conference 12
Liquid film flow and deformation of the surface caused by Marangoni effect on a small heat transfer surface heated in a pulsewise manner
Abstrakt
A thin liquid film on a horizontal solid surface is heated in a pulsewise manner from beneath using a small heater.
The behavior of the transient deformation of the film surface resulting from liquid flow induced by the Marangoni
effect is investigated. A significant deformation close to the breaking up of the liquid film and the prompt
recovery after heating are clearly observed on and around the heater. Mist consisting of ultra-fine particles is also
observed to emerge from the thinned liquid surface as the heating power is increased. The vertical displacement
of the liquid film surface is measured using a laser focus displacement meter. The time dependent wave form of
the displacement exhibits sequential characteristic stages. The interaction between the forces acting on the liquid
surface in directions normal to and parallel to the heater length and the liquid flow from the heater to the side wall are suggested to significantly affect the deformation of the thin liquid film.