Baier, Tobias ; Herbert, Stefan ; Hardt, Steffen (2012)
Leidenfrost solids on structured surfaces.
Proceedings of the 3rd European Conference on Microfluidics. Heidelberg, Germany (December 3-5, 2012,)
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
We present a model for the propulsion of Leidenfrost solids, such as discs of dry ice, on asymmetrically structured surfaces. The model is based on continuum transport equations for momentum and energy. The propulsion mechanism is a net viscous drag on the Leidenfrost solid due to the directed motion of sublimated gas into the deep sections of the grooves in the heater-surface. Solving the model in lubrication approximation, we show the structure of the pressure and flow field in the gap and the dependence of the (normal) pressure force, keeping the Leidenfrost solid afloat, on the gap width, as well as the (tangential) viscous force in dependence on the gap width. A power-law dependence is obtained between the average viscous force per area and the height of a disc of dry ice as \tau \~ H1:7 ice .
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Baier, Tobias ; Herbert, Stefan ; Hardt, Steffen |
| Art des Eintrags: | Bibliographie |
| Titel: | Leidenfrost solids on structured surfaces |
| Sprache: | Englisch |
| Publikationsjahr: | 2012 |
| Veranstaltungstitel: | Proceedings of the 3rd European Conference on Microfluidics |
| Veranstaltungsort: | Heidelberg, Germany |
| Veranstaltungsdatum: | December 3-5, 2012, |
| Kurzbeschreibung (Abstract): | We present a model for the propulsion of Leidenfrost solids, such as discs of dry ice, on asymmetrically structured surfaces. The model is based on continuum transport equations for momentum and energy. The propulsion mechanism is a net viscous drag on the Leidenfrost solid due to the directed motion of sublimated gas into the deep sections of the grooves in the heater-surface. Solving the model in lubrication approximation, we show the structure of the pressure and flow field in the gap and the dependence of the (normal) pressure force, keeping the Leidenfrost solid afloat, on the gap width, as well as the (tangential) viscous force in dependence on the gap width. A power-law dependence is obtained between the average viscous force per area and the height of a disc of dry ice as \tau \~ H1:7 ice . |
| ID-Nummer: | paper # µFLU12-55 |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet für Technische Thermodynamik (TTD) Exzellenzinitiative Exzellenzinitiative > Exzellenzcluster Zentrale Einrichtungen Exzellenzinitiative > Exzellenzcluster > Center of Smart Interfaces (CSI) 16 Fachbereich Maschinenbau > Fachgebiet Nano- und Mikrofluidik (NMF) |
| Hinterlegungsdatum: | 07 Feb 2013 09:35 |
| Letzte Änderung: | 08 Aug 2019 07:57 |
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