Linder, Nicklas (2015)
Numerical Simulation of Complex Wetting.
Technische Universität Darmstadt
Dissertation, Erstveröffentlichung
Kurzbeschreibung (Abstract)
Many multiphase-flows are governed by capillarity and wettability such as spray painting and ink-jet printing applications, cooling devices of small scaled microchips and inside internal combustion engines referring to the fuel injection. The contact angle is a decisive parameter when such a system is analyzed. If the contact angle is in the bounds of the hysteresis, the contact line is pinned (immobile). An accurate numerical simulation is not trivial because of the contact line singularity, a good measure of the contact line velocity as well as the realization of pinning. In this study, the implementation of the dynamic contact angle is extended, accounting for contact line pinning as well as the dynamic behavior in the advancing and receding phase. In short, the whole contact angle hysteresis is realized. The implementation has been validated by considering the cases of a drop impact on a horizontal surface, the simulation of drops on inclined surfaces and drops exposed to a shear flow. Moreover, the wetting of geometrically complex surfaces has been investigated and an approach for the modeling of the geometrical influence on a flat wall by a boundary condition is presented.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2015 | ||||
Autor(en): | Linder, Nicklas | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Numerical Simulation of Complex Wetting | ||||
Sprache: | Englisch | ||||
Referenten: | Tropea, Prof. Cameron ; Bothe, Prof. Dieter ; Roisman, PD. Ilia | ||||
Publikationsjahr: | 2015 | ||||
Ort: | Darmstadt | ||||
Datum der mündlichen Prüfung: | 20 Januar 2015 | ||||
URL / URN: | http://tuprints.ulb.tu-darmstadt.de/4361 | ||||
Kurzbeschreibung (Abstract): | Many multiphase-flows are governed by capillarity and wettability such as spray painting and ink-jet printing applications, cooling devices of small scaled microchips and inside internal combustion engines referring to the fuel injection. The contact angle is a decisive parameter when such a system is analyzed. If the contact angle is in the bounds of the hysteresis, the contact line is pinned (immobile). An accurate numerical simulation is not trivial because of the contact line singularity, a good measure of the contact line velocity as well as the realization of pinning. In this study, the implementation of the dynamic contact angle is extended, accounting for contact line pinning as well as the dynamic behavior in the advancing and receding phase. In short, the whole contact angle hysteresis is realized. The implementation has been validated by considering the cases of a drop impact on a horizontal surface, the simulation of drops on inclined surfaces and drops exposed to a shear flow. Moreover, the wetting of geometrically complex surfaces has been investigated and an approach for the modeling of the geometrical influence on a flat wall by a boundary condition is presented. |
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Alternatives oder übersetztes Abstract: |
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Freie Schlagworte: | Wetting, contact angle, hysteresis, contact line | ||||
URN: | urn:nbn:de:tuda-tuprints-43615 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau | ||||
Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet Strömungslehre und Aerodynamik (SLA) Exzellenzinitiative Zentrale Einrichtungen Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ) > Hochleistungsrechner Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ) Exzellenzinitiative > Graduiertenschulen > Graduate School of Computational Engineering (CE) Exzellenzinitiative > Graduiertenschulen |
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Hinterlegungsdatum: | 08 Mär 2015 20:55 | ||||
Letzte Änderung: | 22 Sep 2016 08:05 | ||||
PPN: | |||||
Referenten: | Tropea, Prof. Cameron ; Bothe, Prof. Dieter ; Roisman, PD. Ilia | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 20 Januar 2015 | ||||
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