Bubble counter based on photoelectric technique for leakage detection of cryogenic valves

Tao, Jin; Xu, Bin; Tang, Ke; Hong, Jian-ping

doi:10.1631/jzus.a071430

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Along with the direction of fluid flow, the pressure inside the tiny bubbles gradually decreases, and the pressure inside the main bubble will decrease when a small bubble is produced each time [66]. The volume fraction profiles of the bubble on the wall after a certain period of time at different inlet velocities are shown in Figure 13 for the initial state distribution of the bubble pf 3/4 circle, 1/2 circle, and 1/4 circle, respectively [67][68][69][70]. The motion of the 3/4 circle bubble after a period of time is shown in Figure 13a-d for the inlet velocities of 30, 40, 50, and 60 m/s, respectively.…”

Section: Bubble Burst On the Wallmentioning

confidence: 99%

“…As shown in Figure 13a-d, it is easily concluded that the bubble burst on the wall becomes more sufficient with the increase in flow rate. Due to the flow rate range being 30-60 m/s, when the flow rate is 60 m/s, the bubble burst is the most sufficient, and the acceleration effect on particles is the The volume fraction profiles of the bubble on the wall after a certain period of time at different inlet velocities are shown in Figure 13 for the initial state distribution of the bubble pf 3/4 circle, 1/2 circle, and 1/4 circle, respectively [67][68][69][70]. The motion of the 3/4 circle bubble after a period of time is shown in Figure 13a-d for the inlet velocities of 30, 40, 50, and 60 m/s, respectively.…”

Section: Bubble Burst On the Wallmentioning

confidence: 99%

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Dynamic Characteristics and Wall Effects of Bubble Bursting in Gas-Liquid-Solid Three-Phase Particle Flow

Wang

et al. 2020

Processes

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The bubble bursting process existing in the particle flow is a complex gas-liquid-solid three-phase coupling dynamic problem. The bubble bursting mechanism, including dynamic characteristics and wall effects, is not clear. To address the above matters, we present a modeling method for the piecewise linear interface calculation-volume of fluid (PLIC-VOF) based bubble burst. The bubble bursting process near or on the wall is analyzed to reveal the dynamic characteristics of bubble bursting and obtain the effect of a bubble bursting on the surrounding flow field. Then a particle image velocimetry (PIV) based self-developed experimental observation platform is established, and the effectiveness of the proposed method is verified. Research results indicate that, in the high-speed turbulent environment, a large pressure difference existed in the bubble tail, which induces the bubble burst to occur; the distance between the wall and the bubble decreases; the higher the flow velocity is, the less time is acquired for bubble bursting, but when the flow velocity exceeds the critical velocity 50 m/s, more time is needed; the coalescence-burst process of double bubbles increases the bubble bursting time, which causes the acceleration of particle motion to reduce.

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Section: Bubble Burst On the Wallmentioning

confidence: 99%

Section: Bubble Burst On the Wallmentioning

confidence: 99%

Dynamic Characteristics and Wall Effects of Bubble Bursting in Gas-Liquid-Solid Three-Phase Particle Flow

Wang

et al. 2020

Processes

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“…Especially in microflow gauging, the bubble size and velocity are monitored in real time and compensated for in the fluid volume, which is a relatively effective method. Many technologies are currently adopted for the detection of microbubbles in tubes, such as capacitive detection [7], photoelectric detection [8], ultrasonic detection [9], image processing [10,11], etc. For capacitive detection, a high detection accuracy is difficult to obtain, and the photoelectric detection method is affected by the liquid's color.…”

Section: Introductionmentioning

confidence: 99%

A Fast Bubble Detection Method in Microtubes Based on Pulsed Ultrasound

et al. 2021

Micromachines

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In the process of biological microfluidic manipulation, the bubbles generated in the tube will seriously reduce the gauging accuracy. This paper introduces an improving method that can estimate the size of microbubbles in real time. Hence, the measurement data of the liquid volume can be modified according to this method. A microbubble detector based on the pulsed-ultrasound method was studied, including the device structure and the working principle. The assessment formula of the microbubbles in the tube was derived from the simulation results, which adopted the two-phase theory. The digital image processing method was applied to fulfill the microbubble calibration. This detection method was applied to measure the microbubbles in the tube and to modify the flow volume in a timely manner. The results of the experiments showed that this method is effective at improving the microflow gauging accuracy.

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A simple and novel volumetric method to metre low gas flows from laboratory-scale bioreactors and its application on laboratory sludge digesters

Tauber

Berta

Szabó

et al. 2011

Appl Microbiol Biotechnol

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A novel, cheap and easy to use method has been developed to measure low gas yields in bioreactors, based on the principle of bubble counting via digital imaging techniques and pattern recognition. No external hardware control is required for the measurements, and the device can be turned into a multichannel tool without further detector accessories. The method proved to perform outstandingly according to the testing and calibrating measurements against standard gas flow and revealed a short periodicity in the gas yields of two parallel laboratory-scale mesophilic biogas reactors providing well analysable data about them. For exact characterization of the oscillation, the data were converted into Morell wavelet spectra, which showed that every feeding period had a characteristic and similarly shaped wavelet profile, thereby this rhythm must have had an immanent source in the community metabolism, and it was not an artefact.

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Bubble counter based on photoelectric technique for leakage detection of cryogenic valves

Cited by 5 publications

References 5 publications

Dynamic Characteristics and Wall Effects of Bubble Bursting in Gas-Liquid-Solid Three-Phase Particle Flow

Dynamic Characteristics and Wall Effects of Bubble Bursting in Gas-Liquid-Solid Three-Phase Particle Flow

A Fast Bubble Detection Method in Microtubes Based on Pulsed Ultrasound

A simple and novel volumetric method to metre low gas flows from laboratory-scale bioreactors and its application on laboratory sludge digesters

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