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Fluid mechanics of flow through rectangular hydrophobic microchannels

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Fluid mechanics of flow through rectangular hydrophobic microchannels

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dc.contributor.author Kashaninejad, Navid
dc.contributor.author Chan, Weng Kong
dc.contributor.author Nguyen, Nam-Trung
dc.date.accessioned 2012-05-11T08:50:00Z
dc.date.available 2012-05-11T08:50:00Z
dc.date.copyright 2011
dc.date.issued 2012-05-11
dc.identifier.citation Kashaninejad, N., Chan, W. K., & Nguyen, N. T. (2011). Fluid Mechanics of Flow through Rectangular Hydrophobic Microchannels. Proceedings of the 9th International Conference on Nanochannels, Microchannels and Minichannels, Canada.
dc.identifier.uri http://hdl.handle.net/10220/7928
dc.description.abstract In this study, the effect of two important parameters have been evaluated for pressure driven liquid flows in microchannel in laminar regime by analytical modeling, followed by experimental measurement. These parameters are wettability conditions of microchannel surfaces and aspect ratio of rectangular microchannels. For small values of aspect ratio, the channel was considered to a have rectangular cross-section, instead of being two parallel plates. Novel expressions for these kinds of channels were derived using Eigen function expansion method. The obtained two-dimensional solutions based on dual finite series were then extended to the case of a constant slip velocity at the bottom wall. In addition, for large values of aspect ratio, a general equation was obtained which is capable of accounting for different values of slip lengths for both upper and lower channel walls. Firstly, it was found that for low aspect ratio microchannels, the results obtained by analytical rectangular 2-D model agree well with the experimental measurements as compared to one dimensional solution. For high aspect ratio microchannels, both models predict the same trend. This finding indicates that using the conventional 1-D solution may not be accurate for the channels where the width is of the same order as the height. Secondly, experimental results showed that up to 2.5% and 16% drag reduction can be achieved for 1000 and 250 micron channel height, respectively. It can be concluded that increasing the surface wettability can reduce the pressure drop in laminar regime and the effect is more pronounced by decreasing the channel height.
dc.language.iso en
dc.rights © 2011 ASME
dc.subject DRNTU::Engineering::Mechanical engineering
dc.title Fluid mechanics of flow through rectangular hydrophobic microchannels
dc.type Conference Paper
dc.contributor.conference International Conference on Nanochannels, Microchannels and Minichannels (9th : 2011 : Canada)
dc.contributor.school School of Mechanical and Aerospace Engineering
dc.identifier.openurl http://www.asmeconferences.org/ICNMM2011/

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