Moving droplets

The measurement of contact lines

Conference paper (2014)

Authors

C. Poelma

M.J.Z. Franken

H. Kim

J. Westerweel

Department

Process and Energy (Mechanical, Maritime and Materials Engineering) (TU Delft)

Flow visualization Contact line dynamics Tomo-PIV Shadowgraphy Partially-wetting fluid Total Internal Reflection Fluorescence Micro/nanoscale Precursor film

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Published Date

24-06-2014

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Source:

ISFV 16: 16th International Symposium on Flow Visualization, Okinawa, Japan, 24-28 June 2014

Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Abstract

Contact lines are the locations where a gas, liquid and a solid meet. From everyday experience we know that such contact lines can be mobile, for example in the case of a water droplet sliding over a glass surface. However, the continuum description of the flow towards or away from a contact line implies that the forces diverge as one approaches a moving contact line. This fundamental problem is of relevance to many applications, and in particular to the development and application of immersion lithography, where a liquid droplet is positioned between the lithographic optical head and the substrate that moves under it. This contribution will address experiments dealing with the shape and stability of a moving droplet and experiments that investigate the underlying behaviour of the nanoscale structure of the moving contact line.

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