Flow visualization and image analysis of gas-phase AC corona discharge induced electrohydrodynamic liquid flow in a stratified fluid

Ohyama, Ryu-ichiro; Kaneko, Kiyoji; Chang, Jen‐Shih

doi:10.1109/tdei.2003.1176562

Cited by 16 publications

(8 citation statements)

References 13 publications

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“…Based on the above results, a range of frequencies from 800 Hz to 1500 Hz has been established for the most optimized velocity of ion wind, which is in good agreement with the frequencies as cited in ACdriven corona generated ion wind literature 21,[48][49][50] . The frequency range is related to the enhancement of the electric field on the ion wind cloud 59 .…”

Section: Resultssupporting

confidence: 79%

“…For example, Kim et al 48 observed that the onset voltage in DCD was 10% -20% lower than that of the DC regime using wire-to-half ring configuration, and the effect of AC on the increase of ion wind was noticed in the range of frequencies 2000 Hz -3000 Hz. Meanwhile, using the point-to-ring configuration, ion wind reached a peak value in the range of frequencies 500 Hz -1000 Hz and 200 Hz -2300 Hz by Ohyama et al 49,50 and Drews et al 21 , respectively. The difference in the mechanism of above two methods results in the different ion wind characteristics.…”

Section: Introductionmentioning

confidence: 95%

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Dual-pin electrohydrodynamic generator driven by alternating current

Dau

Dinh

Tran

et al. 2018

Experimental Thermal and Fluid Science

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We report a unique alternating current (AC) driven corona based air-flow generator using symmetrically arranged electrodes. Unlike the conventional configuration where one electrode generates charged ions moving towards the reference electrode, this configuration allows both negative and positive charges to simultaneously move away from the device and generate ion wind in parallel with the electrodes. In comparison with the direct current (DC) driven corona generator, the time oscillating AC field allows the device a better stabilization owing to the independence of ion wind strength from the inter-electrode spacing. Our results by both simulation and experiment showed that when the AC frequency exceeds a threshold value of 1100 Hz, the electric field at the electrode tips is determined dominantly by the charge cloud created in the previous half-cycle, resulting in stronger net electric field and thus stronger ion wind. In addition, the electrode separation in the AC driven corona based generator is less critical above the frequency threshold, yielding a more robust design with minimized susceptibility to manufacturing tolerances and impurities on the electrodes. Moreover, lower voltage levels of the AC driven system allow simpler and more economical design in the high voltage circuit of the AC generator.

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Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 95%

Dual-pin electrohydrodynamic generator driven by alternating current

Dau

Dinh

Tran

et al. 2018

Experimental Thermal and Fluid Science

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“…3 The existence of ionic wind is demonstrated with smoke particles ͓Fig. 1͑a͔͒ exceeds a threshold value for gas ionization, corona discharge occurs.…”

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confidence: 99%

Electrohydrodynamic surface microvortices for mixing and particle trapping

Yeo

Hou

Maheshswari

et al. 2006

Applied Physics Letters

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We report a free-surface electrohydrodynamic flow phenomenon driven by an ionic wind mechanism induced by a high frequency gas-phase ac field ͑Ͼ10 kHz͒. Intense vortices Ͼ1 cm/s are generated above a critical voltage, beyond which the vortices break down to spawn off new vortex pairs leading to a cascade of vortices over a continuum of length scales; the mixing efficiency approaches a turbulent-like state. Colloidal particles are attracted and aggregated into planar crystal structures within the vortices by a combination of dielectrophoresis and shear-induced diffusion.

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“…vation, it must then recirculate, resulting in internal meridional recirculation vortices in the bulk of the liquid. 15 If the velocity of the air thrust onto the liquid surface is sufficient, a small interfacial depression of the fluid surface at the center accompanies the secondary recirculating flow. 16 If the corona electrode is inclined ͑0°Ͻ Ͻ 90°͒ symmetrically along the centerline as illustrated in Fig.…”

mentioning

confidence: 99%

Electric tempest in a teacup: The tea leaf analogy to microfluidic blood plasma separation

Yeo

Friend

Arifin

2006

Applied Physics Letters

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In a similar fashion to Einstein’s tea leaf paradox, the rotational liquid flow induced by ionic wind above a liquid surface can trap suspended microparticles by a helical motion, spinning them down towards a bottom stagnation point. The motion is similar to Batchelor [Q. J. Mech. Appl. Math. 4, 29 (1951)] flows occurring between stationary and rotating disks and arises due to a combination of the primary azimuthal and secondary bulk meridional recirculation that produces a centrifugal and enhanced inward radial force near the chamber bottom. The technology is thus useful for microfluidic particle trapping/concentration; the authors demonstrate its potential for rapid erythrocyte/blood plasma separation for miniaturized medical diagnostic kits.

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Flow visualization and image analysis of gas-phase AC corona discharge induced electrohydrodynamic liquid flow in a stratified fluid

Cited by 16 publications

References 13 publications

Dual-pin electrohydrodynamic generator driven by alternating current

Dual-pin electrohydrodynamic generator driven by alternating current

Electrohydrodynamic surface microvortices for mixing and particle trapping

Electric tempest in a teacup: The tea leaf analogy to microfluidic blood plasma separation

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