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 437825
Title The effect of pore geometry on premix membrane emulsification using nickel sieves having uniform pores
Author(s) Nazir, A.; Schroën, C.G.P.H.; Boom, R.M.
Source Chemical Engineering Science 93 (2013). - ISSN 0009-2509 - p. 173 - 180.
Department(s) Food Process Engineering
Publication type Refereed Article in a scientific journal
Publication year 2013
Keyword(s) microfluidic devices - multiple emulsions - agarose beads - microcapsules - flow - homogenization - microchannels - dispersions - delivery - size
Abstract Oil-in-water premix membrane emulsification was successfully carried out using various nickel sieves having rectangular (widthoolength) or squared pores. The emulsification process was characterized using droplet Reynolds number (Red), droplet Weber number (Wed) and dimensionless pressure (Pratio). The inertial forces were found to be more important for sieves having rectangular pores that allow more chances for liquid–liquid interactions. Whereas, in case of sieves having squared pores spontaneous droplet break-up due to Laplace pressure differences may be more important. The curve between Wed and Pratio represents a change in the droplet break-up mechanism from spontaneous to shear based (extension) for each sieve (depending on ingoing droplet size) and between different sieves (in terms of efficient energy usage). Stacking sieves either on top of each other or at some distance was found to have no additional effect on droplet break-up compared to two separate passes. This illustrates the importance of matching the residence time between two passes with the interfacial dynamics of the surfactant system used.
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