Transient Three-Dimensional Flow Field Measurements by Means of 3D µPTV in Drying Poly(Vinyl Acetate)-Methanol Thin Films Subject to Short-Scale Marangoni Instabilities

Convective Marangoni instabilities in drying polymer films may induce surface deformations, which persist in the dry film, deteriorating product performance. While theoretic stability analyses are abundantly available, experimental data are scarce. We report transient three-dimensional flow field me...

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Bibliographic Details
Published inPolymers Vol. 13; no. 8; p. 1223
Main Authors Tönsmann, Max, Scharfer, Philip, Schabel, Wilhelm
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 10.04.2021
MDPI
Subjects
Boundary conditions
Convection cells
Drying
Marangoni convection
Methanol
Molecular weight
Polymer films
Polymers
Solvents
Stability analysis
Thin films
Three dimensional flow
Vinyl acetate
Viscosity
Marangoni number
flow field
polymer film drying
particle tracking velocimetry
convective instability
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Summary:Convective Marangoni instabilities in drying polymer films may induce surface deformations, which persist in the dry film, deteriorating product performance. While theoretic stability analyses are abundantly available, experimental data are scarce. We report transient three-dimensional flow field measurements in thin poly(vinyl acetate)-methanol films, drying under ambient conditions with several films exhibiting short-scale Marangoni convection cells. An initial assessment of the upper limit of thermal and solutal Marangoni numbers reveals that the solutal effect is likely to be the dominant cause for the observed instabilities.
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ISSN:2073-4360
2073-4360
DOI:10.3390/polym13081223