Linear oscillations of a drop in uniform alternating electric fields

Yang, Wenrui; Carleson, T.E.

doi:10.1002/aic.690371102

Cited by 5 publications

(5 citation statements)

References 10 publications

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“…The resonant frequency of second mode oscillations is a function of the densities, viscosities, field strength, interfacial tension, drop size, and permittivity of the continuous phase. Experimental observations of the frequency response curve and drop streamlines were found to agree with the theoretical predictions (Yang and Carleson, 1991) and compared well to other results (Scott and Byers, 1989).…”

Section: Alternating Current Effects Upon Single Dropssupporting

confidence: 83%

“…Theoretical predictions of the effect of the field strength and drop physical properties on the resonant frequency agree with observations (Tang and Carleson, 1991;Carleson, et al, 1993). Recent work indicates that a laser actuated dye tracer can be used to follow the development of concentration profiles in an oscillating drop (Carleson, et al, 1993).…”

Section: B Single Drops In Alternating Current Fieldssupporting

confidence: 80%

“…Digitized images of concentration profiles of an oscillating drop (oscillations acoustically produced) were also obtained. Drop concentration profiles resembled the predicted drop velocity streamlines from the earlier work (Yang and Carleson, 1991).…”

Section: An Experimental Systemssupporting

confidence: 73%

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Effect of electric fields on mass transfer to droplets. Final report

Carleson¹,

Budwig²

1994

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During the six year funding period, the effects of a direct and alternating field upon single drop hydrodynamics and mass transfer were evaluated both experimentally and theoretically. Direct current field effects upon drop size, velocity and mass transfer rates were also observed for multiple drops formed in a three stage sieve tray column. Drop size, velocity, and mass transfer rates were measured experimentally and compared to simple models for direct current electric fields. Agreement between theory and experiment was found for drop charge, size, and velocity. Drop mass transfer coefficients were substantially larger than theoretical predictions while extraction efficiencies were moderately higher. Drop distortion and oscillation were observed and are thought to result in the experimentally observed higher values. For alternating current fields, drop flow streamlines and oscillations were measured and found to compare well with predictions from a solved mathematical model. In addition, equipment was constructed to determine mass transfer rates to oscillating drops. Concentration profiles in still and oscillating drops were measured and qualitatively compared to theoretical predictions. D_AIMER This reportwas preparedas an accountof worksponsoredby an agencyof the United States Government.Neitherthe United States Governmentnor any agencythereof,nor any of their employees,makes any warranty,expressor implied,or assumesany legal liabilityor responsibility for the accuracy,completeness, or usefulnessof any information, apparatus,product,or processdisclosed,or representsthat its use would not infringeprivatelyowned rights. Reference hereinto any specificcommercialproduct,process, or serviceby tradename,trademark, manufacturer, or otherwisedoes not necessarilyconstituteor imply its endorsement,recommendation,or favoringby the United States Governmentor any agency thereof.The views and opinions of authorsexpressedherein do not necessarilystate or reflect those of the United StatesGovernment or any agencythereof. %

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Section: Alternating Current Effects Upon Single Dropssupporting

confidence: 83%

Section: B Single Drops In Alternating Current Fieldssupporting

confidence: 80%

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Effect of electric fields on mass transfer to droplets. Final report

Carleson¹,

Budwig²

1994

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“…higher droplet velocities resulting from EHD forces of repulsion exerted on the charged drops in the direction of motion (Thornton, 1968;Bailes, 1981;Takamatsu et al, 1983;Yamaguchi et al, 1985;Vu and Carleson, 1986); enhanced circulations inside and around droplets due to the tangential component of the EHD forces exerted on the droplet surface (Morrison, 1977;Griffiths and Morrison, 1979;Chang et al, 1982;Chang and Berg, 1983); induced droplet oscillations by electric field due to the droplet deformation effect (Thornton, 1976;Wham and Byers, 1987;Scott and Byers, 1989;Basaran et al, 1989;Scott et al, 1990;Yang and Carleson, 1991); interfacial-tension-induced flow by the local variations in the effective interfacial tension due to the presence of electrical charges (Austin et al, 1971;Iyer and Sawistowski, 1974;Carleson and Berg, 1984;Berg, 1985a, 1985b;Carleson and Fuller, 1987). The basic techniques to achieve electrically enhanced liquid-liquid extraction are briefly summarized in Table 1.…”

Section: Electric Fieldsmentioning

confidence: 99%

The effect of electric field on mass transfer from drops dispersed in a viscous liquid

He¹,

Baird²,

Chang³

1993

Can. J. Chem. Eng.

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Mass transfer of benzoic acid from drops dispersed into a continuous phase of mineral oil with high viscosity has been investigated both with and without an imposed non‐uniform d.c. electric field. Total mass transfer efficiency was significantly enhanced in the presence of the high voltage electric field. The results indicate that the application of the electric field to the drop formation process does not change the fundamental mass transfer mechanisms and the mass transfer during drop free fall can also be described by existing mass transfer models. The results also suggest that the high viscosity of the continuous phase inhibits the drops oscillation as well as circulation when the drop sizes become smaller under the applied high voltage electric field. Therefore the significant enhancement of mass transfer efficiency in the present work is mainly due to the increased specific interfacial area.

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“…. Research Abstract 1990-1991 in certain cases droplet direct contact heat transfer rates can be significantly enhanced by the application of an alternating electric field. This field can produce shape oscillations in a droplet which will enhance mixing.…”

mentioning

confidence: 99%

Drop oscillation and mass transfer in alternating electric fields

Carleson¹

1992

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Linear oscillations of a drop in uniform alternating electric fields

Abstract: Oscillations of a conducting drop immersed in a dielectric

Cited by 5 publications

References 10 publications

Effect of electric fields on mass transfer to droplets. Final report

Effect of electric fields on mass transfer to droplets. Final report

The effect of electric field on mass transfer from drops dispersed in a viscous liquid

Drop oscillation and mass transfer in alternating electric fields

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