Microscopic and macroscopic structure of the precursor layer in spreading viscous drops

H. Pirouz Kavehpour; Ben Ovryn; Gareth H. McKinley

doi:10.1103/PhysRevLett.91.196104

Microscopic and macroscopic structure of the precursor layer in spreading viscous drops

H. Pirouz Kavehpour, Ben Ovryn, Gareth H. McKinley

Anatomy & Structural Biology

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

111 Scopus citations

Abstract

We study the spreading of viscous nonvolatile liquids on smooth horizontal substrates using a phase-modulated interference microscope with sufficient dynamic range to enable the simultaneous measurement of both the inner (“microscopic”) length scale and the outer (“macroscopic”) flow scale in addition to the intermediate matching region. The resulting measurements of both the apparent contact angle and the lateral scale of the precursor “wetting” film agree quantitatively with theoretical predictions for a van der Waal’s liquid over a wide range of capillary numbers.

Original language	English (US)
Journal	Physical Review Letters
Volume	91
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.91.196104
State	Published - 2003

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General Physics and Astronomy

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title = "Microscopic and macroscopic structure of the precursor layer in spreading viscous drops",

abstract = "We study the spreading of viscous nonvolatile liquids on smooth horizontal substrates using a phase-modulated interference microscope with sufficient dynamic range to enable the simultaneous measurement of both the inner (“microscopic”) length scale and the outer (“macroscopic”) flow scale in addition to the intermediate matching region. The resulting measurements of both the apparent contact angle and the lateral scale of the precursor “wetting” film agree quantitatively with theoretical predictions for a van der Waal{\textquoteright}s liquid over a wide range of capillary numbers.",

author = "Kavehpour, {H. Pirouz} and Ben Ovryn and McKinley, {Gareth H.}",

note = "Funding Information: This research was supported by the NASA Micro?>gravity fluid physics program under Grant No. NAG3-2155. The authors would like to acknowledge stimulating discussions with S. Garoff, S. H. Davis, H. A. Stone, and ?>J. Eggers on the topic of moving contact lines.",

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AB - We study the spreading of viscous nonvolatile liquids on smooth horizontal substrates using a phase-modulated interference microscope with sufficient dynamic range to enable the simultaneous measurement of both the inner (“microscopic”) length scale and the outer (“macroscopic”) flow scale in addition to the intermediate matching region. The resulting measurements of both the apparent contact angle and the lateral scale of the precursor “wetting” film agree quantitatively with theoretical predictions for a van der Waal’s liquid over a wide range of capillary numbers.

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Microscopic and macroscopic structure of the precursor layer in spreading viscous drops

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