Instability of the Contact Line between Three Fluid Phases during Mass Transfer Processes

  • The movable contact line between two liquids and a gas phase sensitively reacts to small disturbances in the force equilibrium. The shape of the contact line and the adjoining interfaces is determined by the interface and surface tensions, the contact angles, the density differences (hydrostatic pressure), and the Laplace capillary pressure. When these change, the three-phase contact line can deform and even become unstable. Interface and surface tension depend on the concentration and temperature. During mass transport processes (concentration changes) various forms of the instability of the contact line can be observed: —Oscillations of a circular contact line (regular expansion and reduction); —Single deformations (bulges) which quickly disappear again; —Deformations (bulges) which run along the boundary line; —Periodically generated and damped deformations with different modes. The behavior of the three-phase contact line is of practical importance for coalescence processesThe movable contact line between two liquids and a gas phase sensitively reacts to small disturbances in the force equilibrium. The shape of the contact line and the adjoining interfaces is determined by the interface and surface tensions, the contact angles, the density differences (hydrostatic pressure), and the Laplace capillary pressure. When these change, the three-phase contact line can deform and even become unstable. Interface and surface tension depend on the concentration and temperature. During mass transport processes (concentration changes) various forms of the instability of the contact line can be observed: —Oscillations of a circular contact line (regular expansion and reduction); —Single deformations (bulges) which quickly disappear again; —Deformations (bulges) which run along the boundary line; —Periodically generated and damped deformations with different modes. The behavior of the three-phase contact line is of practical importance for coalescence processes and for spontaneous emulsification on liquid surfaces.zeige mehrzeige weniger

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Metadaten
Autor*innen:Lothar Weh
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Journal of colloid and interface science
Jahr der Erstveröffentlichung:2000
Verlag:Elsevier
Verlagsort:Orlando, Fla.
Jahrgang/Band:227
Ausgabe/Heft:1
Erste Seite:42
Letzte Seite:47
Freie Schlagwörter:Contact angle; Interface instability; Surface tension; Three phase contact
DOI:10.1006/jcis.2000.6858
ISSN:0021-9797
ISSN:1095-7103
Verfügbarkeit des Dokuments:Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
Bibliotheksstandort:ZJ 48
Datum der Freischaltung:19.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:16.05.2001
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