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Friction drag reduction of Taylor–Couette flow over air-filled microgrooves

Published online by Cambridge University Press:  19 November 2024

Xiaochao Liu Open the ORCID record for Xiaochao Liu [Opens in a new window] ,
Chenxi You Open the ORCID record for Chenxi You [Opens in a new window] ,
Yanlin Cao Open the ORCID record for Yanlin Cao [Opens in a new window] ,
Baorui Xu Open the ORCID record for Baorui Xu [Opens in a new window] ,
Yantao Yang Open the ORCID record for Yantao Yang [Opens in a new window] ,
Hongyuan Li Open the ORCID record for Hongyuan Li [Opens in a new window] ,
Pengyu Lv Open the ORCID record for Pengyu Lv [Opens in a new window] ,
Chao Sun Open the ORCID record for Chao Sun [Opens in a new window]  and
Huiling Duan Open the ORCID record for Huiling Duan [Opens in a new window]
Xiaochao Liu
Affiliation:
State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, PR China
Chenxi You
Affiliation:
State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, PR China
Yanlin Cao
Affiliation:
State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, PR China
Baorui Xu
Affiliation:
State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, PR China
Yantao Yang
Affiliation:
State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, PR China Laoshan Laboratory, Qingdao 266237, PR China
Hongyuan Li
Affiliation:
State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, PR China Laoshan Laboratory, Qingdao 266237, PR China CAPT, HEDPS and IFSA Collaborative Innovation Center of MoE, Peking University, Beijing 100871, PR China
Pengyu Lv
Affiliation:
State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, PR China Laoshan Laboratory, Qingdao 266237, PR China
Chao Sun
Affiliation:
Department of Engineering Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, PR China New Cornerstone Science Laboratory, Center for Combustion Energy, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, PR China
Huiling Duan*
Affiliation:
State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, PR China CAPT, HEDPS and IFSA Collaborative Innovation Center of MoE, Peking University, Beijing 100871, PR China
*
†Email address for correspondence: [email protected]
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Abstract

Reducing drag under high turbulence is a critical but challenging issue that has engendered great concern. This study utilizes hydrophilic tips in superhydrophobic (SHP) grooves to enhance the stability of plastron, which results in a considerable drag reduction ($DR$) up to 62 %, at Reynolds number ($Re$) reaching $2.79 \times 10^{4}$. The effect of the spacing width $w$ of the microgrooves on both $DR$ and flow structures is investigated. Experimental results demonstrate that $DR$ increases as either microgroove spacing $w$ or $Re$ increases. The velocity fields obtained using particle image velocimetry indicate that the air-filled SHP grooves induce a considerable wall slip. This slip significantly weakens the intensity of Taylor rolls, reduces local momentum transport, and consequently lowers drag. This phenomenon becomes more pronounced with increasing $w$. Furthermore, to quantify the multiscale relationship between global response and geometrical as well as driving parameters, $DR\sim (w, \phi _s, Re)$, a theoretical model is established based on angular momentum defect theory and magnitude estimate. It is demonstrated that a decrease in the surface solid fraction can reduce wall shear, and an increase in the groove width can weaken turbulence kinetic energy production, rendering enhanced slip and drag reduction. This research has implications for designing and optimizing turbulent-drag-reducing surfaces in various engineering applications, such as transportation and marine engineering.

JFM classification

Flow Control: Drag reduction Turbulent Flows: Turbulence control
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 999 , 25 November 2024 , A63
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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Supplementary material: File

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Stability of liquid-gas interfaces on V-grooves with and without hydrophilic tips at different Reynolds numbers
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