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Citation link: https://doi.org/10.26092/elib/2448

Publisher DOI: https://doi.org/10.1007/s10404-016-1809-z
I. Graur, J.G. Méolans, P. Perrier, F. Thöming, T. Veltke_ A physical explanation ot the gas flow diode effect_ 2016_accepted version_Deckblatt_pdfa1.pdf
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A physical explanation of the gas flow diode effect


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I. Graur, J.G. Méolans, P. Perrier, F. Thöming, T. Veltke_ A physical explanation ot the gas flow diode effect_ 2016_accepted version_Deckblatt_pdfa1.pdf987.09 kBAdobe PDFView/Open
Authors: Graur, I. 
Méolans, J. G. 
Perrier, P. 
Thöming, J.  
Veltzke, T. 
Abstract: 
Gas flow properties in channels with slightly varying cross section have a dependency on the direction of channel perfusion when the gas is in the slip and transitional flow regimes. In the past, it was observed that the flow rate in converging direction is higher compared to the case where the channel diverges alongside. This gas flow diode effect does neither exist in the continuum regime nor in the free molecular regime, and it has its maximum at the same level of gaseous rarefaction as the well-known Knudsen minimum. However, no comprehensive study on the physics of this diode effect is carried out yet. In order to overcome this knowledge gap, the current paper proceeds our previous works by an appropriate experimental study. Here we can show that the diode effect crucially depends on the proportion of inclined walls to the overall channel inner surface. Also the inclination of the wall itself determines the strength of the diode effect meaning that the diodicity increases with the opening angle. Furthermore, we found indication that the diodicity also depends on the molar mass and the internal structure of the impinging gas molecules. Finally, we propose an explanation of the diode effect that is mainly based on the tangential reflection process of gas molecules colliding with the inclined walls of a tapered channel.
Keywords: Mass Flow Rate; Knudsen Number; Hydraulic Diameter; Slip Boundary Condition; Tapered Channel; Mimenima
Issue Date: 11-Oct-2016
Publisher: Springer
Project: MIMENIMA GRK 1860 
Funders: Deutsche Forschungsgemeinschaft
Grant number: 601090
Journal/Edited collection: Microfluidics and Nanofluidics 
Type: Artikel/Aufsatz
ISSN: 1613-4982
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/2448
URN: urn:nbn:de:gbv:46-elib71271
Institution: Universität Bremen 
Faculty: Zentrale Wissenschaftliche Einrichtungen und Kooperationen 
Institute: Zentrum für Umweltforschung und nachhaltige Technologien (UFT) 
Appears in Collections:Forschungsdokumente

  

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