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Critical solutal marangoni number correlation for short-scale convective instabilities in drying poly(Vinyl acetate)-methanol thin films

Tönsmann, Max 1; Scharfer, Philip 1; Schabel, Wilhelm 1
1 Karlsruher Institut für Technologie (KIT)


A new empiric correlation for the critical solutal Marangoni number as function of the Péclet and Schmidt numbers is proposed. It is based on previously published experimental flow field data in drying poly(vinyl acetate)-methanol films with an initial thickness in the range of 20–100 μm and an initial solvent load of 1 to 2 gMeOH/gPVAc, as well as newly derived concentration profile measurements and 1D drying simulations. The analysis accounts for realistic transient material properties and describes the occurrence of short-scale convective Marangoni (in)stabilities during the entire drying process with an accuracy of 9%. In addition, the proposed correlation qualitatively follows trends known from theory. As convective Marangoni instabilities in drying polymer films may induce surface deformations, which persist in the dry film, the correlation may facilitate future process design for either thin films with uniform thickness or deliberate self-assembly.

Verlagsausgabe §
DOI: 10.5445/IR/1000137580
Veröffentlicht am 24.09.2021
DOI: 10.3390/polym13172955
Zitationen: 2
Web of Science
Zitationen: 2
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Thermische Verfahrenstechnik (TVT)
Materialwissenschaftliches Zentrum für Energiesysteme (MZE)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2021
Sprache Englisch
Identifikator ISSN: 2073-4360
KITopen-ID: 1000137580
HGF-Programm 43.31.02 (POF IV, LK 01) Devices and Applications
Erschienen in Polymers
Verlag MDPI
Band 13
Heft 17
Seiten Art.-Nr.: 2955
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 31.08.2021
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