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Capillary Pumping Independent Of Liquid Sample Viscosity
KTH, School of Electrical Engineering (EES), Micro and Nanosystems. (Microfluidics)
KTH, School of Electrical Engineering (EES), Micro and Nanosystems. (Microfluidics)ORCID iD: 0000-0001-8531-5607
KTH, School of Electrical Engineering (EES), Micro and Nanosystems. (Microfluidics)ORCID iD: 0000-0001-8248-6670
2016 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827Article in journal (Refereed) Published
Abstract [en]

Capillary flow is a dominating liquid transport phenomenon on the micro- and nanoscale. As described at the beginning of the 20th century, the flow rate during imbibition of a horizontal capillary tube follows the Washburn equation, i.e. decreases over time and depends on the viscosity of the sample. This poses a problem for capillary driven systems that rely on a predictable flow rate and where the liquid viscosity is not precisely known. Here we introduce and successfully experimentally verify the first compact capillary pump design with a flow rate constant in time and independent of the liquid viscosity that can operate over an extended period of time. We also present a detailed theoretical model for gravitation independent capillary filling, which predicts the novel pump performance to within measurement error margins, and in which we, for the first time, explicitly identify gas inertia dominated flow as a fourth distinct flow regime in capillary pumping. These results are of potential interest for a multitude of applications and we expect our results to find most immediate applications within lab-on-a-chip systems and diagnostic devices.

Place, publisher, year, edition, pages
Washington, DC 20036: American Chemical Society (ACS), 2016.
Keyword [en]
capillary pump viscosity independent
National Category
Engineering and Technology
Research subject
Engineering Mechanics
URN: urn:nbn:se:kth:diva-196135DOI: 10.1021/acs.langmuir.6b03488ISI: 000389557400009ScopusID: 2-s2.0-85002561573OAI: diva2:1046159
EU, Horizon 2020

QC 20161117

Available from: 2016-11-11 Created: 2016-11-11 Last updated: 2017-01-09Bibliographically approved

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Guo, WeijinHansson, Jonasvan der Wijngaart, Wouter
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