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Dynamics of volatile liquid droplets on heated surfaces: theory versus experiment

Sodtke, C. and Ajaev, V. S. and Stephan, Peter (2008):
Dynamics of volatile liquid droplets on heated surfaces: theory versus experiment.
In: Journal of Fluid Mechanics, pp. 343-362, 610, ISSN 0022-1120, [Online-Edition: http://dx.doi.org/10.1017/S0022112008002759],
[Article]

Abstract

We consider the evaporation of volatile liquid droplets deposited on a heated substrate in a pure saturated vapour environment. A mathematical model is developed that incorporates the effects of surface tension, evaporation, thermocapillarity, gravity, disjoining pressure, as well as unsteady heat conduction in the solid substrate. The apparent contact line is treated mathematically as a transition region between the macroscopic droplet shape and the adsorbed film of liquid on the heated substrate. Theoretical parametric studies are conducted to clarify the effects of thermocapillarity and wetting properties on the droplet dynamics. An experimental study is conducted in a closed container with de-ionized water droplets on a stainless steel foil heated by an electric current. The interface shapes are recorded together with the temperature profiles under the droplets, measured using thermochromic liquid crystals. Experiment and theory are in very good agreement as long as the conditions of applicability of our lubrication-type mathematical model are satisfied.

Item Type: Article
Erschienen: 2008
Creators: Sodtke, C. and Ajaev, V. S. and Stephan, Peter
Title: Dynamics of volatile liquid droplets on heated surfaces: theory versus experiment
Language: German
Abstract:

We consider the evaporation of volatile liquid droplets deposited on a heated substrate in a pure saturated vapour environment. A mathematical model is developed that incorporates the effects of surface tension, evaporation, thermocapillarity, gravity, disjoining pressure, as well as unsteady heat conduction in the solid substrate. The apparent contact line is treated mathematically as a transition region between the macroscopic droplet shape and the adsorbed film of liquid on the heated substrate. Theoretical parametric studies are conducted to clarify the effects of thermocapillarity and wetting properties on the droplet dynamics. An experimental study is conducted in a closed container with de-ionized water droplets on a stainless steel foil heated by an electric current. The interface shapes are recorded together with the temperature profiles under the droplets, measured using thermochromic liquid crystals. Experiment and theory are in very good agreement as long as the conditions of applicability of our lubrication-type mathematical model are satisfied.

Journal or Publication Title: Journal of Fluid Mechanics
Volume: 610
Divisions: 16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
16 Department of Mechanical Engineering
Zentrale Einrichtungen
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Date Deposited: 17 Mar 2015 14:52
Official URL: http://dx.doi.org/10.1017/S0022112008002759
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