In this paper, a 3D hydrophobic model was developed using User-Defined Functions to investigate the flow characteristics and drag reduction mechanism of spheres with various hydrophobic types. The results confirmed that for the fully hydrophobic spheres, the separation point was continuously shifted back and the separation angle was reduced from 57.6° to 29.5° when the dimensionless slip length was increased from 0.02 to 0.1. The length of the recirculation zone was reduced from 1.90D to 0.93D, which was 51% shorter. And the decreasing fluctuation energy made the vortex structure transformed from hairpin-shaped vortices to vortex-ring. In addition, the drag reduction of partial-hydrophobic spheres was closely related to the number and location of the sudden change interfaces.
Révisé le :
Accepté le :
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Ju Liu 1 ; Junwei Yu 2, 1 ; Lingbing Kong 2 ; Yonghui Guo 1 ; Hang Yu 3 ; Kuo Yuan 1
CC-BY 4.0
@article{CRMECA_2022__350_G1_171_0,
author = {Ju Liu and Junwei Yu and Lingbing Kong and Yonghui Guo and Hang Yu and Kuo Yuan},
title = {Study on the drag reduction mechanism of spheres with various hydrophobic types},
journal = {Comptes Rendus. M\'ecanique},
pages = {171--189},
publisher = {Acad\'emie des sciences, Paris},
volume = {350},
year = {2022},
doi = {10.5802/crmeca.110},
language = {en},
}
TY - JOUR AU - Ju Liu AU - Junwei Yu AU - Lingbing Kong AU - Yonghui Guo AU - Hang Yu AU - Kuo Yuan TI - Study on the drag reduction mechanism of spheres with various hydrophobic types JO - Comptes Rendus. Mécanique PY - 2022 SP - 171 EP - 189 VL - 350 PB - Académie des sciences, Paris DO - 10.5802/crmeca.110 LA - en ID - CRMECA_2022__350_G1_171_0 ER -
%0 Journal Article %A Ju Liu %A Junwei Yu %A Lingbing Kong %A Yonghui Guo %A Hang Yu %A Kuo Yuan %T Study on the drag reduction mechanism of spheres with various hydrophobic types %J Comptes Rendus. Mécanique %D 2022 %P 171-189 %V 350 %I Académie des sciences, Paris %R 10.5802/crmeca.110 %G en %F CRMECA_2022__350_G1_171_0
Ju Liu; Junwei Yu; Lingbing Kong; Yonghui Guo; Hang Yu; Kuo Yuan. Study on the drag reduction mechanism of spheres with various hydrophobic types. Comptes Rendus. Mécanique, Volume 350 (2022), pp. 171-189. doi : 10.5802/crmeca.110. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.110/
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