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Heat Pipe Science and Technology, An International Journal

ISSN Print: 2151-7975
ISSN Online: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.v5.i1-4.30
pages 59-67

OSCILLATING MENISCI AND LIQUID FILMS AT EVAPORATION/CONDENSATION

Vadim S. Nikolayev
Service de Physique de l'Etat Condensé, CNRS UMR 3680, IRAMIS/DSM/CEA Saclay, 91191 Gif-sur-Yvette, France
Senthilkumar Sundararaj
CEA-INAC/SBT, UMR E9004 CEA-UJF Grenoble, 38054 Cedex 9, France

ABSTRACT

To understand the functioning of the pulsating heat pipe (PHP), a liquid film formed by a unique oscillating meniscus is studied under evaporation or condensation conditions within a 2D numerical approach based on the lubrication approximation. The transient heat and mass transfer problem coupled with hydrodynamics is solved within a Taylor bubble hydrodynamics problem. A simple expression for the film thickness time evolution is obtained as a function of the meniscus velocity among other parameters. The time evolution of the meniscus shape is calculated. Based on it, the heat and mass exchange at the gas-liquid interface is evaluated. The contributions of both flat film and curved portion of the gas-liquid interface to the overall heat transfer are analyzed. A criterion defining whether the film is flat or wedge-like, is proposed.


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