Machine vision based measurement of dynamic contact angles in microchannel flows

V. Heiskanen, K. Marjanen, P. Kallio

    Research output: Contribution to journalArticleScientificpeer-review

    11 Citations (Scopus)
    107 Downloads (Pure)

    Abstract

    When characterizing flows in miniaturized channels, the determination of the dynamic contact angle is important. By measuring the dynamic contact angle, the flow properties of the flowing liquid and the effect of material properties on the flow can be characterized. A machine vision based system to measure the contact angle of front or rear menisci of a moving liquid plug is described in this article. In this research, transparent flow channels fabricated on thermoplastic polymer and sealed with an adhesive tape are used. The transparency of the channels enables image based monitoring and measurement of flow variables, including the dynamic contact angle. It is shown that the dynamic angle can be measured from a liquid flow in a channel using the image based measurement system. An image processing algorithm has been developed in a MATLAB environment. Images are taken using a CCD camera and the channels are illuminated using a custom made ring light. Two fitting methods are experimented and the results compared in the measurement of the dynamic contact angles; a circle and two parabolas.
    Translated title of the contributionMachine vision based measurement of dynamic contact angles in microchannel flows
    Original languageEnglish
    Pages (from-to)282-290
    JournalJournal of Bionic Engineering
    Volume5
    Issue number4
    DOIs
    Publication statusPublished - 2008
    Publication typeA1 Journal article-refereed

    Publication forum classification

    • No publication forum level

    Fingerprint

    Dive into the research topics of 'Machine vision based measurement of dynamic contact angles in microchannel flows'. Together they form a unique fingerprint.

    Cite this