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Leidenfrost solids on structured surfaces

Baier, Tobias and Herbert, Stefan and Hardt, Steffen (2012):
Leidenfrost solids on structured surfaces.
In: Proceedings of the 3rd European Conference on Microfluidics, Heidelberg, Germany, December 3-5, 2012,, [Conference or Workshop Item]

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 and Herbert, Stefan and Hardt, Steffen
Title: Leidenfrost solids on structured surfaces
Language: English
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 .

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)
Event Title: Proceedings of the 3rd European Conference on Microfluidics
Event Location: Heidelberg, Germany
Event Dates: December 3-5, 2012,
Date Deposited: 07 Feb 2013 09:35
Identification Number: paper # µFLU12-55
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