Effect of surface mobility on the particle sliding along a bubble or a solid sphere

Weixing Wang; Zhiang Zhou; K. Nandakumar; Zhenghe Xu; Jacob H. Masliyah

doi:10.1016/S0021-9797(02)00140-6

Effect of surface mobility on the particle sliding along a bubble or a solid sphere

Weixing Wang, Zhiang Zhou, K. Nandakumar^*, Zhenghe Xu, Jacob H. Masliyah

^*Corresponding author for this work

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

26 Scopus citations

Abstract

The sliding velocity of glass beads on a spherical surface, made either of an air bubble or of a glass sphere held stationary, is measured to investigate the effect of surface mobility on the particle sliding velocity. The sliding process is recorded with a digital camera and analyzed frame by frame. The sliding glass bead was found to accelerate with increasing angular position on the collector's surface. It reaches a maximum velocity at an angular position of about 100° and then, under certain conditions, the glass bead leaves the surface of the collector. The sliding velocity of the glass bead depends strongly on the surface mobility of a bubble, decreasing with decreasing surface mobility. By a mobile surface we mean one which cannot set up resistive forces to an applied stress on the surface. The sliding velocity on a rigid surface, such as a glass sphere, is much lower than that on a mobile bubble surface. The sliding velocity can be described through a modified Stokes equation. A numerical factor in the modified Stokes equation is determined by fitting the experimental data and is found to increase with decreasing surface mobility. Hydrophobic glass beads sliding on a hydrophobic glass sphere were found to stick at the point of impact without sliding if the initial angular position of the impact is less than some specific angle, which is defined as the critical sticking angle. The sticking of the glass beads can be attributed to the capillary contracting force created by the formation of a cavity due to spontaneous receding of the nonwetting liquid from the contact zone. The relationship between the critical sticking angle and the particle size is established based on the Yushchenko [J. Colloid Interface Sci. 96 (1983) 307] analysis.

Original language	English
Pages (from-to)	81-88
Number of pages	8
Journal	Journal of Colloid and Interface Science
Volume	259
Issue number	1
DOIs	https://doi.org/10.1016/S0021-9797(02)00140-6
State	Published - 1 Mar 2003
Externally published	Yes

Keywords

Capillary contracting force
Flotation
Hydrophobicity
Particle sliding velocity
Particle-bubble attachment

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10.1016/S0021-9797(02)00140-6

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@article{7600dc0965f04ee484c82b779138d017,

title = "Effect of surface mobility on the particle sliding along a bubble or a solid sphere",

abstract = "The sliding velocity of glass beads on a spherical surface, made either of an air bubble or of a glass sphere held stationary, is measured to investigate the effect of surface mobility on the particle sliding velocity. The sliding process is recorded with a digital camera and analyzed frame by frame. The sliding glass bead was found to accelerate with increasing angular position on the collector's surface. It reaches a maximum velocity at an angular position of about 100° and then, under certain conditions, the glass bead leaves the surface of the collector. The sliding velocity of the glass bead depends strongly on the surface mobility of a bubble, decreasing with decreasing surface mobility. By a mobile surface we mean one which cannot set up resistive forces to an applied stress on the surface. The sliding velocity on a rigid surface, such as a glass sphere, is much lower than that on a mobile bubble surface. The sliding velocity can be described through a modified Stokes equation. A numerical factor in the modified Stokes equation is determined by fitting the experimental data and is found to increase with decreasing surface mobility. Hydrophobic glass beads sliding on a hydrophobic glass sphere were found to stick at the point of impact without sliding if the initial angular position of the impact is less than some specific angle, which is defined as the critical sticking angle. The sticking of the glass beads can be attributed to the capillary contracting force created by the formation of a cavity due to spontaneous receding of the nonwetting liquid from the contact zone. The relationship between the critical sticking angle and the particle size is established based on the Yushchenko [J. Colloid Interface Sci. 96 (1983) 307] analysis.",

keywords = "Capillary contracting force, Flotation, Hydrophobicity, Particle sliding velocity, Particle-bubble attachment",

author = "Weixing Wang and Zhiang Zhou and K. Nandakumar and Zhenghe Xu and Masliyah, {Jacob H.}",

note = "Funding Information: The financial support for this work from the Syncrude–NSERC Chair Program in Oil Sands (held by JHM) and the Alberta Department of Energy are gratefully acknowledged. ",

year = "2003",

month = mar,

day = "1",

doi = "10.1016/S0021-9797(02)00140-6",

language = "英语",

volume = "259",

pages = "81--88",

journal = "Journal of Colloid and Interface Science",

issn = "0021-9797",

publisher = "Academic Press Inc.",

number = "1",

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TY - JOUR

T1 - Effect of surface mobility on the particle sliding along a bubble or a solid sphere

AU - Wang, Weixing

AU - Zhou, Zhiang

AU - Nandakumar, K.

AU - Xu, Zhenghe

AU - Masliyah, Jacob H.

N1 - Funding Information: The financial support for this work from the Syncrude–NSERC Chair Program in Oil Sands (held by JHM) and the Alberta Department of Energy are gratefully acknowledged.

PY - 2003/3/1

Y1 - 2003/3/1

N2 - The sliding velocity of glass beads on a spherical surface, made either of an air bubble or of a glass sphere held stationary, is measured to investigate the effect of surface mobility on the particle sliding velocity. The sliding process is recorded with a digital camera and analyzed frame by frame. The sliding glass bead was found to accelerate with increasing angular position on the collector's surface. It reaches a maximum velocity at an angular position of about 100° and then, under certain conditions, the glass bead leaves the surface of the collector. The sliding velocity of the glass bead depends strongly on the surface mobility of a bubble, decreasing with decreasing surface mobility. By a mobile surface we mean one which cannot set up resistive forces to an applied stress on the surface. The sliding velocity on a rigid surface, such as a glass sphere, is much lower than that on a mobile bubble surface. The sliding velocity can be described through a modified Stokes equation. A numerical factor in the modified Stokes equation is determined by fitting the experimental data and is found to increase with decreasing surface mobility. Hydrophobic glass beads sliding on a hydrophobic glass sphere were found to stick at the point of impact without sliding if the initial angular position of the impact is less than some specific angle, which is defined as the critical sticking angle. The sticking of the glass beads can be attributed to the capillary contracting force created by the formation of a cavity due to spontaneous receding of the nonwetting liquid from the contact zone. The relationship between the critical sticking angle and the particle size is established based on the Yushchenko [J. Colloid Interface Sci. 96 (1983) 307] analysis.

AB - The sliding velocity of glass beads on a spherical surface, made either of an air bubble or of a glass sphere held stationary, is measured to investigate the effect of surface mobility on the particle sliding velocity. The sliding process is recorded with a digital camera and analyzed frame by frame. The sliding glass bead was found to accelerate with increasing angular position on the collector's surface. It reaches a maximum velocity at an angular position of about 100° and then, under certain conditions, the glass bead leaves the surface of the collector. The sliding velocity of the glass bead depends strongly on the surface mobility of a bubble, decreasing with decreasing surface mobility. By a mobile surface we mean one which cannot set up resistive forces to an applied stress on the surface. The sliding velocity on a rigid surface, such as a glass sphere, is much lower than that on a mobile bubble surface. The sliding velocity can be described through a modified Stokes equation. A numerical factor in the modified Stokes equation is determined by fitting the experimental data and is found to increase with decreasing surface mobility. Hydrophobic glass beads sliding on a hydrophobic glass sphere were found to stick at the point of impact without sliding if the initial angular position of the impact is less than some specific angle, which is defined as the critical sticking angle. The sticking of the glass beads can be attributed to the capillary contracting force created by the formation of a cavity due to spontaneous receding of the nonwetting liquid from the contact zone. The relationship between the critical sticking angle and the particle size is established based on the Yushchenko [J. Colloid Interface Sci. 96 (1983) 307] analysis.

KW - Capillary contracting force

KW - Flotation

KW - Hydrophobicity

KW - Particle sliding velocity

KW - Particle-bubble attachment

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U2 - 10.1016/S0021-9797(02)00140-6

DO - 10.1016/S0021-9797(02)00140-6

M3 - 文章

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AN - SCOPUS:0037332414

SN - 0021-9797

VL - 259

SP - 81

EP - 88

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

IS - 1

ER -

Effect of surface mobility on the particle sliding along a bubble or a solid sphere

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Keywords

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