Experimental flow measurements of electrohydrodynamic convection fields by particle image velocimetry

Ohyama, Ryu-ichiro; Kaneko, Kiyoji

doi:10.1109/ceidp.1996.564695

Cited by 2 publications

(3 citation statements)

References 10 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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“…Hauksbee [1] disclosed the existence of corona wind by a discharged electrode. Ohyama et al [2] employed the Particle Imaging Velocimetry (PIV) to measure the flow field driving by EHD mechanism in a dielectric liquid. Their experimental results showed that the forced convection of flow can be easily achieved via EHD technique.…”

Section: Introductionmentioning

confidence: 99%

Study on the Cooling Enhancement of LED Heat Sources via an Electrohydrodynamic Approach

Chau

Lin

Yeh

et al. 2007

IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society

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This study is to investigate the cooling enhancement design of Light-Emitting Diodes (LED) heat sources through an electrohydrodynamic (EHD) approach, where the forced convection of air is achieved by the ion wind due to gas discharge phenomenon. A LED array with eight high-brightness LED units is adopted as the LED heat source in our study. The cooling enhancement system is composed of a heat sink with fins attached to our LED heat source and an array of electrodes connected to a high-voltage DC power supply. The electric field generated by parallel electrodes results in forced convection of air due to ionized particles between fins of heat sink, which significantly enhances the heat transfer from the heat source to outer atmosphere. Two different types of electrodes, i.e. line-type and needle-type, are employed in our experimental measurements. Different operation parameters, such as the number of electrodes, the pitch of electrodes, the input power and the distance between the heat sink and electrodes are systematically studied to evaluate their influences on the cooling enhancement of our LED source. For the purpose of comparison, a traditional cooling fan is also tested in our experiments. The needle electrode is proven more effective than the linear electrode. The proposed EHD approach is found to have the advantages in power saving, noise control and installment space over the cooling fan. With our design, the heat sink temperature can be maintained in the range of 20K30°C from its peak value 65°C (without external cooling) with an DC voltage between 15 and 23kV.

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Experimental flow measurements of electrohydrodynamic convection fields by particle image velocimetry

Cited by 2 publications

References 10 publications

Dual-pin electrohydrodynamic generator driven by alternating current

Dual-pin electrohydrodynamic generator driven by alternating current

Study on the Cooling Enhancement of LED Heat Sources via an Electrohydrodynamic Approach

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