An experimental analysis of ionic wind velocity characteristics in a needle-plate electrode system by means of laser-induced phosphorescence

Kitahara, Yuki; Aoyagi, K.; Ohyama, Ryu-ichiro

doi:10.1109/ceidp.2007.4451475

Cited by 9 publications

(4 citation statements)

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“…The relatively 3 simple point-plane geometry is well suited for experimental characterization -e.g., the parametric optimization of wind velocity -and has been studied both experimentally [25][26][27][28][29] and theoretically. 25,[30][31][32] Because the electric force driving the flow depends on the field between the electrodes, maximum flow rates are achieved for closely spaced electrodes and fall precipitously as electrode separation increases 27,33 (cf. below).…”

Section: Introductionmentioning

confidence: 99%

Electric winds driven by time oscillating corona discharges

Drews

Cademartiri

Whitesides

et al. 2013

Journal of Applied Physics

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We investigate the formation of steady gas flows -so-called electric winds -created by point-plane corona discharges driven by time oscillating (ac) electric fields. By varying the magnitude and frequency of the applied field, we identify two distinct scaling regimes: (i) a low frequency (dc) regime and (ii) a high frequency (ac) regime. These experimental observations are reproduced and explained by a theoretical model describing the transport and recombination of ions surrounding the discharge and their contribution to the measured wind velocity. The two regimes differ in the spatial distribution of ions and in the process by which ions are consumed. Interestingly, we find that ac corona discharges generate strong electric forces localized near the tip of the point electrode, while dc corona discharges generate weaker forces distributed throughout the interelectrode region. Consequently, the velocity of the electric winds (>1 m/s) generated by ac discharges is largely independent of the position of the counter electrode.a Author to whom correspondence should be addressed. Electronic mail: kjmbishop@engr.psu.edu 2 The unified theoretical description of dc and ac electric winds presented here reconciles previous observations of winds driven by dc corona and ac dielectric barrier discharges; insights from the model should also prove useful in the design of other plasma actuators.

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Section: Introductionmentioning

confidence: 99%

Electric winds driven by time oscillating corona discharges

Drews

Cademartiri

Whitesides

et al. 2013

Journal of Applied Physics

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“…Thus, the pumping movement occurs and, with the increase in concentration, it was possible to visualize the rise in this pumping fluid movement. According to Ohyama et al (2007) and Kitahara et al (2007), most of the techniques used to observe this flow have focused on fluorescent molecules.…”

Section: Resultsmentioning

confidence: 99%

Thermocapillary Monitoring Using Particle Image Velocimetry Associated With Dynamic Laser Speckle

Contado

Braga²,

Barbosa³

et al. 2020

Theor Appl Eng

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Thermocapillarity is a physical phenomenon used in many industrial processes, mainly in the field of miniaturization. Thermocapillary forces are the base of thermocapillary pumping (TCP), in which a drop of liquid moves through a microchannel or flat surface after temperature gradient occurs. The objective of this work was to study the thermocapillary convection during pumping without inserting external particles, monitored by the Particle Image Velocimetry (PIV) technique. The experiment consisted of a Pasteur tube containing a yellow fluorescein solution (0.02, 0.04, 0.06, 0.08, and 0.1 Molar), illuminated by a laser beam of 545 nm, 40 mW. After 2 minutes of illumination, the thermocapillary movement occurred at a distance of 0.05 mm below the meniscus when using a laser beam of 545 nm, 3 mW. The images were captured by a charge-coupled device (CCD) camera and processed using the PIV technique. The results showed an internal conversion capacity between the intersystem crossing, vibrational, and relaxation phenomena, also demonstrating the potential for applying the proposed approach. The images presented velocity distribution caused by thermocapillarity. The PIV was a useful tool for convective flow analysis if connected to appropriate image processing and enhancement techniques. In conclusion, the research showed the images with velocity distribution caused by thermocapillarity.

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“…A mathematical model for the needle-to-plate EHD air pump has been developed, verified by a parallel experimental study using a needle-to-mesh EHD air pump, reaching an exit air velocity of 4 m/s with an applied voltage of 13 kV and suggesting that the results are similar when using either a plate or a dense mesh as a collector electrode [131]. Further experimentation with laser-induced phosphorescence velocimetry revealed the profile of the ionic wind velocity of the needle-to-plate electrode configuration, which reached 20 m/s near the tip of the emitter electrode when the applied voltage was 10 kV [132].…”

Section: A General Research On Ehd Fluid Pumpsmentioning

confidence: 90%

Review on the History, Research, and Applications of Electrohydrodynamics

Fylladitakis

Theodoridis

Moronis

2014

IEEE Trans. Plasma Sci.

149

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Corona discharge refers to the phenomenon when the electric field near a conductor is strong enough to ionize the dielectric surrounding it but not strong enough to cause an electrical breakdown or arcing between conductors or other components. This phenomenon is unwanted and dangerous in high-voltage systems; however, a controlled corona discharge may be used to ionize a fluid and induce motion by directly converting the electrical energy into kinetic energy. Phenomena that involve the direct conversion of electrical energy into kinetic energy are known as electrohydrodynamic (EHD) and have a variety of possible applications today. This paper contains a literature review of the research regarding the EHD effects associated with corona discharges, from the first observation of the phenomenon to the most recent advancements on its mathematical modeling, as well as the advancements on specific applications, such as thrust, heat transfer improvement, boundary layer enhancement, drying, fluid pumping, and cooling.

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An experimental analysis of ionic wind velocity characteristics in a needle-plate electrode system by means of laser-induced phosphorescence

Cited by 9 publications

References 11 publications

Electric winds driven by time oscillating corona discharges

Electric winds driven by time oscillating corona discharges

Thermocapillary Monitoring Using Particle Image Velocimetry Associated With Dynamic Laser Speckle

Review on the History, Research, and Applications of Electrohydrodynamics

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