Evaporation from open microchannel grooves

Lab on a Chip
Sibylle KachelWilhelm Schabel

Abstract

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.

References

Jun 6, 2007·Journal of Colloid and Interface Science·G GuénaA M Cazabat
Aug 13, 2011·Journal of Colloid and Interface Science·Fenfen ShaoWilliam Yeong Liang Ling

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Citations

Nov 8, 2014·Biomicrofluidics·Jae-Woo ChoiDemetri Psaltis
Jan 9, 2019·Analytical and Bioanalytical Chemistry·Elisenda FornellsMichael C Breadmore
Apr 25, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Justyna PaluchPaweł Kościelniak
May 23, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Robert K LadeLorraine F Francis
May 6, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Panayiotis KolliopoulosSatish Kumar
Feb 25, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Saifullah LoneSigurdur T Thoroddsen

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