Dynamic Behavior of EHD Extraction Phenomena of Liquids

Hanaoka, Ryoichi; Mizuno, Takanobu; Takata, Shigeo; Fukami, Tadashi; Anzai, Hidenobu

doi:10.1541/ieejfms.131.824

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…20) Many analytical studies about Taylor cones and electrospray have been reported. [21][22][23][24] Although conventional corona discharge generation methods using metallic needle electrodes have a problem of the deterioration of the needle tip, this problem can be solved using a Taylor cone as the electrode. The Taylor cone electrode can be used without damage because it is made of liquid.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric negative corona discharge using Taylor cone as a liquid cathode

Shirai

Sekine

Uchida

et al. 2014

Jpn. J. Appl. Phys.

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We examined the characteristics of atmospheric negative corona discharge using a liquid needle cathode. As a liquid needle cathode, a Taylor cone with conical shape was adopted. A micronozzle was filled with liquid, and a plate electrode was placed above the nozzle. By applying a dc voltage between electrodes, a Taylor cone is formed. To change the liquid property, we added sodium dodecyl sulfate to reduce the surface tension, sodium sulfate to increase the conductivity, and polyvinyl alcohol to increase the viscosity, in distilled water. Liquids with a high surface tension such as pure water could not form a Taylor cone. When we reduced the surface tension, a Taylor cone was formed and a stable corona discharge was observed at the tip of the cone. When we increased viscosity, a liquid filament protruding from the solution surface was formed and corona discharge was observed along the filament at a position 0.7–1.0 mm above the tip of the cone. Increasing the conductivity resulted in the higher light intensity of the corona and the lower corona onset voltage. Using a Taylor cone, different types of corona discharge were observed by changing the property of the liquid.

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Section: Introductionmentioning

confidence: 99%

Atmospheric negative corona discharge using Taylor cone as a liquid cathode

Shirai

Sekine

Uchida

et al. 2014

Jpn. J. Appl. Phys.

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“…On the other hand, there is the phenomenon that the semi-insulating and insulating liquids are extracted towards a higher electric field when a non-uniform electric field is applied to the gas/liquid interface. This is referred to as an EHD extraction phenomenon (EHD-EP) [17,18], which is the target of the present research from a viewpoint of the condensation heat transfer enhancement, flash evaporation, moisture control in liquids etc. [19][20][21].…”

Section: Introduction mentioning

confidence: 99%

Dynamic Behavior and Its Consideration of EHD Liquid Extraction Phenomenon Causing under DC or Low-Frequency AC Voltage

Hanaoka¹,

Fujita²,

Kajiura³

et al. 2019

JEPE

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This paper describes an experimental and theoretical study on an extraction phenomenon of liquids occurring at an air gap between the liquid surface and the electrode by applying a direct current (DC) or low-frequency alternating current (AC) voltage. Three liquids with a different physical property; 2,3-dihydrodecafluoropenten, palm fatty acid ester oil and crude rapeseed oil are used as working liquids. The electrode configuration is the sphere or plane (high voltage electrode) to grounded plane electrode. The grounded plane electrode is fixed to the bottom of the test vessel with working liquid and the high voltage electrode is installed in an air above the liquid surface against the grounded plane electrode. The liquid surface swells towards the high voltage electrode by the increase of voltage and the liquid is extracted in a short time, thereafter the air gap between the liquid surface and the high voltage electrode is bridged at a thick liquid column. Such the liquid behavior displays unique features with voltage polarity effect for each working liquid. The relationship between the applied voltage, current variation, height of swollen liquid, force pulling liquid and dynamic feature of liquid is examined experimentally. The liquid behavior is considered theoretically based on experimental observations. Key words: Electrohydrodynamics (EHD) extraction phenomenon, semi-insulating and insulating liquids, DC or low-frequency AC voltage, dynamic behavior of liquids, moisture removal effect in oil.

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Enhancement of drying rate of moist porous media with dielectrophoresis mechanism

Yang

Yagoobi

2021

Drying Technology

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Dynamic Behavior of EHD Extraction Phenomena of Liquids

Cited by 4 publications

References 13 publications

Atmospheric negative corona discharge using Taylor cone as a liquid cathode

Atmospheric negative corona discharge using Taylor cone as a liquid cathode

Dynamic Behavior and Its Consideration of EHD Liquid Extraction Phenomenon Causing under DC or Low-Frequency AC Voltage

Enhancement of drying rate of moist porous media with dielectrophoresis mechanism

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