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      Demulsification of Kerosene/Water Emulsion in the Transparent Asymmetric Plate-Type Micro-Channel

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          Abstract

          Asymmetric plate-type micro-channels (APM) have one hydrophobic wall and one hydrophilic wall. By flowing through APM, a kerosene-in-water emulsion can be de-emulsified in one second. To date, however, the demulsification process in the APM is still a black box. In order to observe the demulsification process directly, transparent asymmetric plate-type micro-channels (TAPM) were fabricated with two surface-modified glass plates. Emulsions with oil contents of 10%, 30%, and 50% were pumped through TAPM with heights of 39.2 μm and 159.5 μm. The movement and coalescence of oil droplets (the dispersed phase of a kerosene-in-water emulsion) in the TAPM were observed directly with an optical microscope. By analyzing videos and photographs, it was found that the demulsification process included three steps: oil droplets flowed against and were adsorbed on the hydrophobic wall, then oil droplets coalesced to form larger droplets, whereupon the oil phase was separated. The experimental results showed that the demulsification efficiency was approximately proportional to the oil content (30–50%) of the emulsions and increased when the micro-channel height was reduced.

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          Two-phase microfluidic flows

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            Review of the applications of microreactors

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              Micromixer-assisted polymerization processes

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                Author and article information

                Journal
                Micromachines (Basel)
                Micromachines (Basel)
                micromachines
                Micromachines
                MDPI
                2072-666X
                19 December 2018
                December 2018
                : 9
                : 12
                : 680
                Affiliations
                College of Chemistry & Environment Protection Engineering, Southwest Minzu University, Chengdu 610041, China; ruanda199402@ 123456gmail.com (D.R.); diliyar0513@ 123456gmail.com (D.H.); mazhengdong18@ 123456gmail.com (Z.-D.M.); puyadong28@ 123456gmail.com (Y.-D.P.)
                Author notes
                [* ]Correspondence: shaw.cx@ 123456gmail.com
                Article
                micromachines-09-00680
                10.3390/mi9120680
                6315529
                30572660
                271eef0f-d318-4b8d-94da-624ad838476a
                © 2018 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 23 October 2018
                : 18 December 2018
                Categories
                Article

                micro-channel,liquid-liquid two phase flow,transparent,asymmetric,demulsification

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