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Drag reduction mechanism of vapour‐assisted liquid membrane lubrication on texture surface with elevated temperature
Author(s) -
Chen Cheng,
Lu Yan,
Xue Chao
Publication year - 2021
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.1558
Subject(s) - drag , texture (cosmology) , lubrication , materials science , volume fraction , membrane , composite material , mechanics , chemistry , physics , artificial intelligence , computer science , image (mathematics) , biochemistry
In this study, a vapour‐assisted drag reduction mechanism of texture surface with elevated temperature is explored. The computational fluid dynamics simulation is performed to understand the vapour membrane generated by the coupled effect of elevated temperature and surface texture. Simulation results indicated that elevated temperature may help generate the vapour membrane which can isolate the liquid water from the solid surface, thereby reducing friction. Meanwhile the introduction of surface micro‐texture has dramatic positive effect in vapour volume fraction, vapour thickness and the average velocity of outflow. It was found that introducing the micro‐texture to the elevated surface has dramatic positive effect in reducing frictional drag, the groove formed by the micro‐texture can store vapour and form a vapour vortex inside, which may have a certain driving effect on the fluid.