Oscillatory driven cavity with an air/water interface and an insoluble monolayer: Surface viscosity effects

Juan Lopez; Amir H. Hirsa

doi:10.1006/jcis.2001.7894

Oscillatory driven cavity with an air/water interface and an insoluble monolayer: Surface viscosity effects

Juan Lopez, Amir H. Hirsa

Mathematical and Statistical Sciences, School of (SoMSS)

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

11 Scopus citations

Abstract

Flow in a planar cavity bounded by stationary side walls, a fiat gas/liquid interface covered by an insoluble monolayer, and driven by sinusoidal motion of the floor is examined numerically. Navier-Stokes computations with the Boussinesq-Scriven surface model are presented utilizing the equation-of-state measured for a vitamin K₁ monolayer on the air/water interface. The results identify a range of initial surfactant concentration for which the surface velocity is sensitive to the surface viscosity B (sum of surface shear and dilatational viscosities) down to 10^-2 surface Poise. Thus, the study suggests a practical method for determining surface viscosities consisting of the measurement of the motion of a tracer particle on the interface and comparisons with numerical computations at various values of B.

Original language	English (US)
Pages (from-to)	1-5
Number of pages	5
Journal	Journal of Colloid And Interface Science
Volume	242
Issue number	1
DOIs	https://doi.org/10.1006/jcis.2001.7894
State	Published - Oct 1 2001

Keywords

Insoluble surfactants
Nonlinear equation-of-state
Surface dilatational viscosity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Biomaterials
Surfaces, Coatings and Films
Colloid and Surface Chemistry

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10.1006/jcis.2001.7894

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title = "Oscillatory driven cavity with an air/water interface and an insoluble monolayer: Surface viscosity effects",

abstract = "Flow in a planar cavity bounded by stationary side walls, a fiat gas/liquid interface covered by an insoluble monolayer, and driven by sinusoidal motion of the floor is examined numerically. Navier-Stokes computations with the Boussinesq-Scriven surface model are presented utilizing the equation-of-state measured for a vitamin K1 monolayer on the air/water interface. The results identify a range of initial surfactant concentration for which the surface velocity is sensitive to the surface viscosity B (sum of surface shear and dilatational viscosities) down to 10-2 surface Poise. Thus, the study suggests a practical method for determining surface viscosities consisting of the measurement of the motion of a tracer particle on the interface and comparisons with numerical computations at various values of B.",

keywords = "Insoluble surfactants, Nonlinear equation-of-state, Surface dilatational viscosity",

author = "Juan Lopez and Hirsa, {Amir H.}",

note = "Funding Information: This work was supported by NSF Grants CTS-9803478 and CTS-9896259.",

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T1 - Oscillatory driven cavity with an air/water interface and an insoluble monolayer

T2 - Surface viscosity effects

AU - Lopez, Juan

AU - Hirsa, Amir H.

N1 - Funding Information: This work was supported by NSF Grants CTS-9803478 and CTS-9896259.

PY - 2001/10/1

Y1 - 2001/10/1

N2 - Flow in a planar cavity bounded by stationary side walls, a fiat gas/liquid interface covered by an insoluble monolayer, and driven by sinusoidal motion of the floor is examined numerically. Navier-Stokes computations with the Boussinesq-Scriven surface model are presented utilizing the equation-of-state measured for a vitamin K1 monolayer on the air/water interface. The results identify a range of initial surfactant concentration for which the surface velocity is sensitive to the surface viscosity B (sum of surface shear and dilatational viscosities) down to 10-2 surface Poise. Thus, the study suggests a practical method for determining surface viscosities consisting of the measurement of the motion of a tracer particle on the interface and comparisons with numerical computations at various values of B.

AB - Flow in a planar cavity bounded by stationary side walls, a fiat gas/liquid interface covered by an insoluble monolayer, and driven by sinusoidal motion of the floor is examined numerically. Navier-Stokes computations with the Boussinesq-Scriven surface model are presented utilizing the equation-of-state measured for a vitamin K1 monolayer on the air/water interface. The results identify a range of initial surfactant concentration for which the surface velocity is sensitive to the surface viscosity B (sum of surface shear and dilatational viscosities) down to 10-2 surface Poise. Thus, the study suggests a practical method for determining surface viscosities consisting of the measurement of the motion of a tracer particle on the interface and comparisons with numerical computations at various values of B.

KW - Insoluble surfactants

KW - Nonlinear equation-of-state

KW - Surface dilatational viscosity

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Oscillatory driven cavity with an air/water interface and an insoluble monolayer: Surface viscosity effects

Abstract

Keywords

ASJC Scopus subject areas

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