ARTICLE:

• INTERFACE DYNAMICS AND HEAT TRANSFER IN EVAPORATING LIQUID FILMS ON MICROSTRUCTURED SURFACES  download article

Tatiana Gambaryan-Roisman
Faculty of Mechanical and Process Engineering, Technische Universität Darmstadt, Petersenstr. 30, 64287 Darmstadt, Germany

Peter Stephan
Technische Universität Darmstadt, Department of Mechanical Engineering, Petersen str. 30, 64287 Darmstadt, Germany

ABSTRACT

The thermofluidic behaviour of thin liquid films on microstructured surfaces has been a focus of numerous studies over the last years. These studies have been motivated by the advantages of such surface structures: the improvement of the film distribution homogeneity over the wall and the intensification of the heat transfer and evaporation. In the present paper the flow of a thin liquid film on a microstructured surface under the influence of the gravity, the thermocapillarity and the phase change has been investigated in the framework of the long-wave theory. First, the liquid-gas interface shape and the film stability under the simultaneous action of gravity and thermocapillarity (without phase change) have been studied. Then, the evolution of an evaporating liquid film on a microstructured surface has been simulated. It has been found that the film deformation dynamics is governed by thermocapillarity or by mass loss during different stages of the evaporation process.

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MPH-17 pages

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