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Conference Paper: Critical frequency for coalescence of emulsions in an AC electric field
Title | Critical frequency for coalescence of emulsions in an AC electric field |
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Authors | |
Issue Date | 2017 |
Publisher | American Physical Society. The Journal's web site is located at http://www.aps.org/meetings/baps/ |
Citation | 70th Annual Meeting of the American Physical Society (APS) Division of Fluid Dynamics, Denver, Colorado, USA, 19–21 November 2017. In Bulletin of the American Physical Society, 2017, v. 62 n. 14, Abstract: G12.00003 How to Cite? |
Abstract | Applying an electric field to trigger the coalescence of emulsions has been applied in various applications which include crude oil recovery, emulsion stability characterization as well as pico-injection and droplet-based chemical reaction in microfluidics. In this work, we systematically investigated the responses of surfactant-stabilized emulsions to a controlled AC electric field using a customer-built chip. At a given amplitude of the AC voltage, we found a critical frequency beyond which the emulsions remain stable. When the frequency is decreased to below the critical value, emulsions coalesce immediately. Such critical frequency is found to be dependent of amplitude of the AC voltage, viscosity of the fluids, concentration and type of the surfactant as well as the electric conductivity of the droplet phase. Using a model based on the drainage of thin film, we have explored the mechanism behind and interpret this phenomenon systematically. Our work extends the understanding of the electro-coalescence of emulsions and can be beneficial for any applications involve the coalescence of droplets in an AC electric field. |
Description | Session G12: Drops: Electric Fields & Interactions - Abstract: G12.00003 (Abstract ID: BAPS.2017.DFD.G12.3) |
Persistent Identifier | http://hdl.handle.net/10722/260730 |
ISSN |
DC Field | Value | Language |
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dc.contributor.author | Liu, Z | - |
dc.contributor.author | Ali, FH | - |
dc.contributor.author | Shum, HC | - |
dc.date.accessioned | 2018-09-14T08:46:27Z | - |
dc.date.available | 2018-09-14T08:46:27Z | - |
dc.date.issued | 2017 | - |
dc.identifier.citation | 70th Annual Meeting of the American Physical Society (APS) Division of Fluid Dynamics, Denver, Colorado, USA, 19–21 November 2017. In Bulletin of the American Physical Society, 2017, v. 62 n. 14, Abstract: G12.00003 | - |
dc.identifier.issn | 0003-0503 | - |
dc.identifier.uri | http://hdl.handle.net/10722/260730 | - |
dc.description | Session G12: Drops: Electric Fields & Interactions - Abstract: G12.00003 (Abstract ID: BAPS.2017.DFD.G12.3) | - |
dc.description.abstract | Applying an electric field to trigger the coalescence of emulsions has been applied in various applications which include crude oil recovery, emulsion stability characterization as well as pico-injection and droplet-based chemical reaction in microfluidics. In this work, we systematically investigated the responses of surfactant-stabilized emulsions to a controlled AC electric field using a customer-built chip. At a given amplitude of the AC voltage, we found a critical frequency beyond which the emulsions remain stable. When the frequency is decreased to below the critical value, emulsions coalesce immediately. Such critical frequency is found to be dependent of amplitude of the AC voltage, viscosity of the fluids, concentration and type of the surfactant as well as the electric conductivity of the droplet phase. Using a model based on the drainage of thin film, we have explored the mechanism behind and interpret this phenomenon systematically. Our work extends the understanding of the electro-coalescence of emulsions and can be beneficial for any applications involve the coalescence of droplets in an AC electric field. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at http://www.aps.org/meetings/baps/ | - |
dc.relation.ispartof | American Physical Society Bulletin | - |
dc.title | Critical frequency for coalescence of emulsions in an AC electric field | - |
dc.type | Conference_Paper | - |
dc.identifier.email | Shum, HC: ashum@hku.hk | - |
dc.identifier.authority | Shum, HC=rp01439 | - |
dc.identifier.hkuros | 290352 | - |
dc.identifier.volume | 62 | - |
dc.identifier.issue | 14 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0003-0503 | - |