Effect of fine bubbles on electric discharge in water

Hayashi, Yui; Kanda, Hideki; Goto, Motonobu

doi:10.1088/0963-0252/24/5/055023

Cited by 35 publications

(22 citation statements)

References 38 publications

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“…Also, the variation of n e as a function of EC is not significant in both liquids. For the in-water discharges, the order of n e is in good agreement with that reported in literature [24,25]; however, for the in-methanol discharges, present estimation of n e is relatively high compared to the reported data [12]. Concerning the effect of EC on the electron density, Vanraes et al [24] also reported that n e is almost independent of EC, although their reported electron density based on Hα for 5 mS/cm is slightly smaller than that of distilled water.…”

Section: Characterization Of Dischargessupporting

confidence: 90%

The effect of electrical conductivity on nanosecond discharges in distilled water and in methanol with argon bubbles

Hamdan

Čerņevičs

Suk

2017

J. Phys. D: Appl. Phys.

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We investigated the effect of a liquid's electrical conductivity (EC) on the physical characteristics of electrical discharges in liquids with gaseous bubbles. Argon gas was supplied into the liquid to form an array of gaseous bubbles in between two electrodes (a pinto-hollow electrode setup). Methanol and water were considered as base liquids, representing a low and a high dielectric permittivity (ε) liquid respectively, while potassium chloride (KCl) was added to control the EC of the liquids. When increasing the EC of the liquids, we found that the discharge probability was reduced by 46% for in-water and 38% for in-methanol discharges. We also found that the injected charge decreased by ~4 µC as the EC increased. Moreover, as the gap distance increased from 1 to 2.5 mm, the injected charge decreased by 2 µC for in-water discharge and by 4 µC for in-methanol discharge. The plasma emission is another important parameter in characterizing discharges. With increasing the EC, the plasma emission volume decreased linearly by a factor of ~5. The plasma lifetime was shortened by around 33% for in-water and 20% for in-methanol discharges in the case of d = 1 mm, while the decrease was 40% for in-water and 30% for in-methanol discharges in the case of d = 2.5 mm. Using the broadening characteristics of the Hα line, the electron density was estimated during the first 100 ns by ~3×10 17 cmˉ3 for in-water discharges and by ~2×10 18 cmˉ3 for inmethanol discharges, and it decreased by about one order of magnitude after 800 ns; note that n e dependence on the EC was not significant. The reported findings provide further understanding of electrical discharges in bubbled liquids and highlight the influence of a liquid's EC, which are useful in the development and optimization of the applications based on such process.

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Section: Characterization Of Dischargessupporting

confidence: 90%

The effect of electrical conductivity on nanosecond discharges in distilled water and in methanol with argon bubbles

Hamdan

Čerņevičs

Suk

2017

J. Phys. D: Appl. Phys.

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“…During discharge plasma formation with the working gas of air or nitrogen, HNO 3 could be generated (NO 3 − concentration 15.45 mg L −1 at 120 min by DBD treatment in our study), acidifying the solution . A buffer solution therefore was added so as to evaluate the influence of pH value as depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Degradation of glucocorticoids in water by dielectric barrier discharge and dielectric barrier discharge combined with calcium peroxide: performance comparison and synergistic effects

Liu

Wang

Huang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Degradation of glucocorticoids (GCs), including fluocinolone acetonide (FA), triamcinolone acetonide (TA) and clobetasol propionate (CP), in water by dielectric barrier discharge (DBD) and DBD combined with calcium peroxide treatment (DBD/CaO 2 ) were investigated. Effects of discharge power, pH, plasma-working gas and CaO 2 dosage were examined during DBD and DBD/CaO 2 treatments. The synergistic output from the combination of CaO 2 with DBD on •OH concentration, pH, conductivity, CaO 2 adsorption and the overall influence on GC removal were assessed. Toxicity variations and feasibility to various water matrices by DBD and DBD/CaO 2 treatments also were analyzed and compared. RESULTS:The removal efficiencies of FA, TA and CP achieved were 74%, 70% and 75%, respectively, at 36.68 W over 120 min in air with unadjusted pH (energy yield of 7.47 mg kW −1 h −1 ). Significant synergistic effects were observed in combining CaO 2 with DBD with a CaO 2 -concentration-dependent mechanism. The removal efficiency of FA, TA and CP increased by 7%, 32% and 31%, respectively, by DBD/CaO 2 in comparison with DBD alone after 60 min treatments at CaO 2 dosage of 0.4 g L −1 . In addition, DBD/CaO 2 treatment was more effective in controlling toxicity and had better efficacy in various water matrices than DBD alone. CONCLUSION:This study provides a reference point for the application of DBD and DBD/CaO 2 treatments to effectively remove GCs from water.

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“…В [24] с помощью компьютерного моделирования показано, что разряд в пузырьке газа, помещенного в жидкость с высокой диэлектрической проницаемостью, развивается вдоль ее поверхности. Подробно вопросы развития разряда в пузырьках газа в жидкости рассмотрены в ряде работ, в частности [7,[25][26][27][28].…”

Section: экспериментальные результаты и обсужденияunclassified

Высоковольтный Импульсный Разряд В Многофазной Системе На Границе Раздела Газ-Жидкость

Анпилов¹,

Бархударов²,

Коссый³

et al. 2021

Журнал Технической Физики

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Приведены экспериментальные результаты исследований высоковольтного импульсного разряда, реализуемого одновременно в жидкости и газе вблизи границы раздела двух фаз. Использована многоэлектродная разрядная система с инжекцией газа в межэлектродное пространство. Предложенная схема организации разряда позволила интенсифицировать процессы обмена между жидкостью и плазмой, обрабатывать обладающую высокой проводимостью жидкость, а также пенообразующую жидкость. Ключевые слова: искровой разряд, очистка жидкости, ультрафиолет, окислители, ударные волны.

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Effect of fine bubbles on electric discharge in water

Cited by 35 publications

References 38 publications

The effect of electrical conductivity on nanosecond discharges in distilled water and in methanol with argon bubbles

The effect of electrical conductivity on nanosecond discharges in distilled water and in methanol with argon bubbles

Degradation of glucocorticoids in water by dielectric barrier discharge and dielectric barrier discharge combined with calcium peroxide: performance comparison and synergistic effects

Высоковольтный Импульсный Разряд В Многофазной Системе На Границе Раздела Газ-Жидкость

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