Instantaneous drag increase on alternate transverse superhydrophobic strips

Xingwei Wang; Luyao Bao; Wufang Yang; Jianbin Zhang; Minghai Qu; Haibao Hu; Feng Zhou; Weimin Liu

doi:10.1016/j.triboint.2020.106613

Instantaneous drag increase on alternate transverse superhydrophobic strips

Xingwei Wang, Luyao Bao, Wufang Yang, Jianbin Zhang, Minghai Qu, Haibao Hu, Feng Zhou, Weimin Liu

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

In the present work, drag increase (DI) is obtained on superhydrophobic surface. The experiments were carried out with a Taylor-Couette rotor with their surface being coated by alternate superhydrophobic and hydrophilic strips in spanwise. The results exhibit a transition Re (Re_T) dividing DI into two stages. Before Re_T, the DI is very inconspicuous, but after Re_T, DI rises sharply and then remains significant. The mechanism is proposed and also verified by numerical simulation. Before Re_T, the deformation of air layer on superhydrophobic surface is slight and thus generates inconspicuous capillary force. After Re_T, the receding contact line detaches from the edge of superhydrophobic surface leading to the air layer deforms more easily resulting in significant capillary force therefore DI is significant.

Original language	English
Article number	106613
Journal	Tribology International
Volume	153
DOIs	https://doi.org/10.1016/j.triboint.2020.106613
State	Published - Jan 2021

Keywords

Capillary force
Solid-liquid friction
Solid-liquid-air interface
Superhydrophobic

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10.1016/j.triboint.2020.106613

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title = "Instantaneous drag increase on alternate transverse superhydrophobic strips",

abstract = "In the present work, drag increase (DI) is obtained on superhydrophobic surface. The experiments were carried out with a Taylor-Couette rotor with their surface being coated by alternate superhydrophobic and hydrophilic strips in spanwise. The results exhibit a transition Re (ReT) dividing DI into two stages. Before ReT, the DI is very inconspicuous, but after ReT, DI rises sharply and then remains significant. The mechanism is proposed and also verified by numerical simulation. Before ReT, the deformation of air layer on superhydrophobic surface is slight and thus generates inconspicuous capillary force. After ReT, the receding contact line detaches from the edge of superhydrophobic surface leading to the air layer deforms more easily resulting in significant capillary force therefore DI is significant.",

keywords = "Capillary force, Solid-liquid friction, Solid-liquid-air interface, Superhydrophobic",

author = "Xingwei Wang and Luyao Bao and Wufang Yang and Jianbin Zhang and Minghai Qu and Haibao Hu and Feng Zhou and Weimin Liu",

note = "Publisher Copyright: {\textcopyright} 2020",

year = "2021",

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doi = "10.1016/j.triboint.2020.106613",

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volume = "153",

journal = "Tribology International",

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T1 - Instantaneous drag increase on alternate transverse superhydrophobic strips

AU - Wang, Xingwei

AU - Bao, Luyao

AU - Yang, Wufang

AU - Zhang, Jianbin

AU - Qu, Minghai

AU - Hu, Haibao

AU - Zhou, Feng

AU - Liu, Weimin

PY - 2021/1

Y1 - 2021/1

N2 - In the present work, drag increase (DI) is obtained on superhydrophobic surface. The experiments were carried out with a Taylor-Couette rotor with their surface being coated by alternate superhydrophobic and hydrophilic strips in spanwise. The results exhibit a transition Re (ReT) dividing DI into two stages. Before ReT, the DI is very inconspicuous, but after ReT, DI rises sharply and then remains significant. The mechanism is proposed and also verified by numerical simulation. Before ReT, the deformation of air layer on superhydrophobic surface is slight and thus generates inconspicuous capillary force. After ReT, the receding contact line detaches from the edge of superhydrophobic surface leading to the air layer deforms more easily resulting in significant capillary force therefore DI is significant.

AB - In the present work, drag increase (DI) is obtained on superhydrophobic surface. The experiments were carried out with a Taylor-Couette rotor with their surface being coated by alternate superhydrophobic and hydrophilic strips in spanwise. The results exhibit a transition Re (ReT) dividing DI into two stages. Before ReT, the DI is very inconspicuous, but after ReT, DI rises sharply and then remains significant. The mechanism is proposed and also verified by numerical simulation. Before ReT, the deformation of air layer on superhydrophobic surface is slight and thus generates inconspicuous capillary force. After ReT, the receding contact line detaches from the edge of superhydrophobic surface leading to the air layer deforms more easily resulting in significant capillary force therefore DI is significant.

KW - Capillary force

KW - Solid-liquid friction

KW - Solid-liquid-air interface

KW - Superhydrophobic

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U2 - 10.1016/j.triboint.2020.106613

DO - 10.1016/j.triboint.2020.106613

M3 - 文章

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SN - 0301-679X

VL - 153

JO - Tribology International

JF - Tribology International

M1 - 106613

ER -

Instantaneous drag increase on alternate transverse superhydrophobic strips

Abstract

Keywords

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