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Issue 4, 2014
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Evaporation from open microchannel grooves

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The evaporation of water from open u-shaped microchannel grooves was investigated with particular emphasis on the roles of channel width and air flow conditions. Given the small dimensions of the microchannels, all measurements were conducted in a range where convection and diffusion are of equal importance and known correlations for the calculation of mass transfer coefficients cannot be applied. The evaporation rates were measured using a new optical method and a gravimetric method. Both measurement methods yielded mass transfer coefficients that are in agreement with each other. The observed relation between mass transfer coefficient, air velocity and channel width vastly differs from the predictions obtained from macroscopic structures. With respect to diagnostic devices we conclude that analyte concentration in an open microchannel groove strongly increases even within short times due to the evaporation process and we show that wider channels are more favourable in terms of minimizing the relative evaporation rate.

Graphical abstract: Evaporation from open microchannel grooves

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Publication details

The article was received on 30 Jul 2013, accepted on 25 Nov 2013 and first published on 25 Nov 2013

Article type: Paper
DOI: 10.1039/C3LC50892G
Citation: Lab Chip, 2014,14, 771-778

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    Evaporation from open microchannel grooves

    S. Kachel, Y. Zhou, P. Scharfer, C. Vrančić, W. Petrich and W. Schabel, Lab Chip, 2014, 14, 771
    DOI: 10.1039/C3LC50892G

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