Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 430543
Title A microfluidic method to study demulsification kinetics
Author(s) Krebs, T.; Schroën, C.G.P.H.; Boom, R.M.
Source Lab on a Chip 12 (2012)6. - ISSN 1473-0197 - p. 1060 - 1070.
DOI https://doi.org/10.1039/C2LC20930F
Department(s) Food Process Engineering
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) simple shear-flow - size distributions - oil-emulsions - break-up - coalescence - drops - droplets - fluid - surfactants - suspensions
Abstract We present the results of experiments studying droplet coalescence in a dense layer of emulsion droplets using microfluidic circuits. The microfluidic structure allows direct observation of collisions and coalescence events between oil droplets dispersed in water. The coalescence rate of a flowing hexadecane-in-water emulsion was measured as a function of the droplet velocity and droplet concentration from image sequences measured with a high-speed camera. A trajectory analysis of colliding droplet pairs allows evaluation of the film drainage profile and coalescence time t(c.) The coalescence times obtained for thousands of droplet pairs enable us to calculate coalescence time distributions for each set of experimental parameters, which are the mean droplet approach velocity (v(0)), the mean dispersed phase fraction (f) and the mean hydraulic diameter of a droplet pair (d(p)). The expected value E(t(c)) of the coalescence time distributions scales as E(t(c)) is proportional to (v(0))(-0.105±0.043)(d(p))(0.562±0.287), but is independent of f. We discuss the potential of the procedure for the prediction of emulsion stability in industrial applications
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