Efficiency of Energy Conversion in Underwater Spark Discharges and Associated Bubble Oscillations: Experimental Results

Buogo, Silvano; Plocek, Jaroslav; Vokurka, K.

doi:10.3813/aaa.918126

Cited by 44 publications

(30 citation statements)

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“…An air-gap switch was used to trigger the discharge through the sparker. Earlier measurements [24] have shown that the current flowing through the discharge circuit has the form of a highly damped sinusoid and depending on the total bank capacity, it drops to zero in 0.3-0.7 ms after the liquid breakdown. A more detailed description of the experimental setup is given in an earlier work [24].…”

Section: Methodsmentioning

confidence: 99%

The Time Difference in Emission of Light and Pressure Pulses From Oscillating Bubbles

Vokurka

2018

Acta Polytech

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Oscillations of spark-generated bubbles are studied experimentally. In this work, an attention is paid to the time difference in the radiation of light flashes and pressure pulses from a bubble at the final stages of the first bubble contraction and the early stages of the first bubble expansion. It is found that light and pressure pulses are not radiated synchronously. In some experiments, the light flashes are radiated before the pressure pulses by a few μs and in other experiments, the light flashes are radiated later than the pressure pulses by a few μs. The time difference in the radiation of the two pulses is examined in detail in relation with the bubble size, bubble oscillation intensity, maximum value of the light flash and the width of the light flash. It is shown that the magnitude of the time differences is very weakly correlated with the bubble size, intensity of oscillation and intensity of the light flashes and that the magnitude of the time differences is only moderately correlated with the light flashes widths.

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Section: Methodsmentioning

confidence: 99%

The Time Difference in Emission of Light and Pressure Pulses From Oscillating Bubbles

Vokurka

2018

Acta Polytech

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“…An air-gap switch was used to trigger the discharge through the sparker. Earlier measurements [36] have shown that the current flowing through the discharge circuit has the form of a highly damped sinusoid and depending on the total bank capacity it drops to zero in 0.3-0.7 ms after the liquid breakdown. A more detailed description of the experimental setup is given in an earlier work [36].…”

Section: Methodsmentioning

confidence: 99%

Experimental study of light emitted by spark-generated bubbles in water

Vokurka

Buogo

2018

Eur. Phys. J. Appl. Phys.

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The emission of light from spark-generated bubbles freely oscillating in water far from boundaries is studied experimentally. The observations concentrate on light flashes radiated at final stages of the first bubble contraction and early stages of the following bubble expansion. It is shown that the shape of the emitted light pulses is not “Gaussian”, but asymmetric with a leading edge moderately growing and a trailing edge steeply decreasing. The maximum values and widths of these optical pulses are determined for bubbles having different sizes and oscillating with different intensities. The variation of the maximum values and pulse widths with bubble size and intensity of oscillation is discussed, as well as the observed weak correlation between these two quantities.

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“…When calculating the value of G, it is assumed that all the input energy is spent on the destruction processes. According to works [47,61,62], most of the input energy of 55-60% is consumed in heating the solution. Around 30% is distributed among radiant energy, generation of acoustic waves, and initiation of the chemical processes (23%) [47].…”

Section: Energy Yieldmentioning

confidence: 99%

Catalytic/inhibitory effect of the joint presence of two dyes on its destruction by underwater plasma processes: a tool for optimization parameters of treatment

et al. 2019

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The underwater plasma was used for the destruction of two-dye mixture. The Direct Blue azo dye and xanthene dye of Rhodamine 6G used as the model pollutants. The concentration of one of them is varied for modeling the processes in which one of the classes of the dye exceeded other dyes. The catalytic/inhibitory effect of the joint presence of two dyes is studied. The effect of initial temperature and the role of H 2 O 2 in the mechanism of destruction were also investigated. It was established that the processes of decay of organic dyes proceed through the stages of the formation of intermediate products, which are catalysts or inhibitors of further degradation processes. An increase in the temperature of the solution has almost no effect on the degree of decolorization of the solution of the dye mixture. It is established that the destruction of Direct Blue 1 occurs under the action of hydrogen peroxide or HO 2 radicals, while Rhodamine 6G is destroyed by interaction with hydroxide radicals. The comparison of energy yield values with published data showed that underwater plasma is an effective method for removing the organic dyes from wastewater.

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Efficiency of Energy Conversion in Underwater Spark Discharges and Associated Bubble Oscillations: Experimental Results

Cited by 44 publications

References 0 publications

The Time Difference in Emission of Light and Pressure Pulses From Oscillating Bubbles

The Time Difference in Emission of Light and Pressure Pulses From Oscillating Bubbles

Experimental study of light emitted by spark-generated bubbles in water

Catalytic/inhibitory effect of the joint presence of two dyes on its destruction by underwater plasma processes: a tool for optimization parameters of treatment

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