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,)
Conference or Workshop Item, Bibliographie
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 .
| Item Type: | Conference or Workshop Item |
|---|---|
| Erschienen: | 2012 |
| Creators: | Baier, Tobias ; Herbert, Stefan ; Hardt, Steffen |
| Type of entry: | Bibliographie |
| Title: | Leidenfrost solids on structured surfaces |
| Language: | English |
| Date: | 2012 |
| Event Title: | Proceedings of the 3rd European Conference on Microfluidics |
| Event Location: | Heidelberg, Germany |
| Event Dates: | December 3-5, 2012, |
| 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 . |
| Identification Number: | paper # µFLU12-55 |
| Divisions: | 16 Department of Mechanical Engineering 16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD) Exzellenzinitiative Exzellenzinitiative > Clusters of Excellence Zentrale Einrichtungen Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI) 16 Department of Mechanical Engineering > Institute for Nano- and Microfluidics (NMF) |
| Date Deposited: | 07 Feb 2013 09:35 |
| Last Modified: | 08 Aug 2019 07:57 |
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