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Carlborg, Carl Fredrik
(författare)
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21st IEEE International Conference on Micro Electro Mechanical Systems (IEEE MEMS 2008), Tucson, AZ, USA, 13-17 Jan, 2008
Continuous flow switching by pneumatic actuation of the air lubrication layer on superhydrophobic microchannel walls [Elektronisk resurs]
Förlag, utgivningsår, omfång ...
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Publicerad:IEEE conference proceedings,Publicerad:2008
Nummerbeteckningar
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LIBRIS-ID:bk56m3zt87c3mw65
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http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24758uri
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urn:nbn:se:kth:diva-24758urn
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10.1109/MEMSYS.2008.4443727doi
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Serie
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PROCEEDINGS: IEEE MICRO ELECTRO MECHANICAL SYSTEMS,1084-6999
Anmärkningar
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<p>QC 20101011</p>
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gratis
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This paper introduces and experimentally verifies a method for robust, active control of friction reduction in microchannels, enabling new flow control applications and overcoming previous limitations with regard to sustainable liquid pressure. The air pockets trapped at a superhydrophobic micrograting during liquid priming are coupled to an actively controlled pressure source, allowing the pressure difference over the air/liquid interface to be dynamically adjusted. This allows for manipulating the friction reduction properties of the surface, enabling active control of liquid mass flow through the channel. It also permits for sustainable air lubrication at theoretically unlimited liquid pressures, without loss of superhydrophobic properties. With the non-optimized grating used in the experiment, a difference in liquid mass flow of 4.8 % is obtained by alternatively collapsing and recreating the air pockets using the coupled pressure source, which is in line with a FE analysis of the same geometry. A FE analysis of a more optimized geometry predicts a mass flow change of over 30%, which would make possible new microfluidic devices based on local friction control. It is also experimentally shown that our method allows for sustainable liquid pressure 3 times higher than the Laplace pressure of a passive device.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Do-Quang, Minh
(författare)
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Stemme, Göran
(författare)
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Amberg, Gustav
(författare)
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van der Wijngaart, Wouter
(författare)
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KTHSkolan för elektro- och systemteknik (EES)
(utgivare)
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KTHSkolan för teknikvetenskap (SCI)
(utgivare)
Sammanhörande titlar
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Del av/supplement till:channel record
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Ingår i:Värdpublikation21st IEEE International Conference on Micro Electro Mechanical Systems (IEEE MEMS 2008)599-602
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Värdpublikation i annat format21st IEEE International Conference on Micro Electro Mechanical Systems (IEEE MEMS 2008)9781424417926
Seriebiuppslag
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PROCEEDINGS: IEEE MICRO ELECTRO MECHANICAL SYSTEMS,1084-6999
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