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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Druckformat: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2011000151
pages 179-186

NUMERICAL MODELING OF DROPLET-SUBSTRATE INTERACTION USING A LATTICE BOLTZMANN MOMENT MODEL

Yali Guo
Key Laboratory of Desalination, Liaoning Province; School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
Rachid Bennacer
L2MGC F-95000, University of Cergy-Pontoise, 95031 Cergy-Pontoise Cedex, Paris, France; ENS-Cachan Dpt GC/LMT/CNRS UMR 8535, 61 Ave. du Président Wilson, 94235 Cachan Cedex, France; Tianjin Key Lab of Refrigeration Technology, Tianjin University of Commerce, 300134
Sheng Qiang Shen
Dalian University of Technology
Weizhong Li
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China

ABSTRAKT

The shape and surface texture of a liquid droplet were studied in two dimensions when a droplet impinges on a solid substrate under isothermal conditions. The lattice Boltzmann moment model was applied to simulate the fluid dynamics considering the adhesive interaction between fluid particles and surfaces. The results show the influence of wetting on the process and the drop shape For a hydrophobic surface, the process after impinging may be divided into two stages: the spreading process driven by inertial forces and the subsequent oscillations (recoiling process) driven by surface tension forces; while for the hydrophilic surface, the droplet will only deposit on the surface and there is no recoiling stage. In addition, the effects of the impingement speed on the droplet shape and texture were studied. The spreading speed and the maximum droplet diameter increase with the rise of the impingement speed. The evaporation and thermal effects were underlined and illustrated.


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