Collapsing characteristics of gas-bearing cavitation bubble

Zhang, Yalei; Xu, Weilin; Zhang, Faxing; Zhang, Qi

doi:10.1007/s42241-018-0094-6

Cited by 11 publications

(4 citation statements)

References 31 publications

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“…(1) The description of all parameters mentioned from Eq.s (1) - (20) in Chapter B is provided in Table II, where R is the radius of gas-nucleus and N is the content of gas-nucleus. This formula is highly consistent with the experimental data of the Ginedroz's gas-nucleus scale distribution, and is considered reliable [29], [30]. The gas-nucleus scale distribution spectrum shown in Fig.…”

Section: B Degassingsupporting

confidence: 83%

Design and Analysis of the Multifunctional Oil-Injection Equipment for Deep-Sea Hydraulic Systems

et al. 2020

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Hydraulic systems have been frequently used in deep-sea equipment because of their renowned long service life, stable and reliable performance. However, impurities contained in hydraulic oil, such as solid particles, gas and water, would jeopardize work efficiency of deep-sea hydraulic systems, and in some extreme cases even cause failure of the whole system, resulting in breakdown of crucial deep-sea equipment. Therefore, this paper aims to present a device, multifunctional oil-injection equipment (MOIE), expected to be able to purify hydraulic oil in deep-sea hydraulic systems. Its major functions are to absorb oil, remove impurities and fill oil, among which the removal of water and gas, i.e. dewatering and degassing, is of significance. Theoretical analysis shows that the paper oil filter is able to remove the solid particles in hydraulic oil, and degassing and dewatering of hydraulic oil could be achieved through vacuum filtration and vacuum heating in high-temperature and low-pressure environment. The prototype of the MOIE is designed and manufactured. The results from laboratory experiments indicate that this equipment can effectively remove solid particles, gas and water from hydraulic oil. This study ensures the stability, safety and reliability of the deep-sea hydraulic system by improving the quality of hydraulic oil.

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Section: B Degassingsupporting

confidence: 83%

Design and Analysis of the Multifunctional Oil-Injection Equipment for Deep-Sea Hydraulic Systems

et al. 2020

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“…When cavitation is generated in a butterfly valve, the flow becomes highly turbulent with numerous vortices, which can be well predicted using the LES model. The specific expressions of the governing equations corresponding to the LES model in the multiscale space are shown in Equation (7):…”

Section: Turbulence Modelmentioning

confidence: 99%

“…At the same time, the adverse effects of cavitation on the project were analyzed, along with the engineering measures that can be taken. Zhang et al [7] studied the cavitation bubbles generated by a high-pressure pulse bubble generation system and discussed the characteristics of cavitation bubbles in terms of collapse process, evolution period, bubble size, and cavitation strength. Zhan et al [8] used molecular dynamics to simulate the cavitation of nuclei of different sizes embedded in water or liquid copper at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Cavitation Characteristics through Butterfly Valve under Different Regulation Conditions

Zhang,

Hu,

Yin

et al. 2024

Processes

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Butterfly valves are widely used in the pipeline transportation industry due to their safety and reliability, as well as their low manufacturing and operation costs. Cavitation is a common phenomenon in the butterfly valve that can lead to serious damage to a valve’s components. Therefore, it is important to investigate the generation and evolution of cavitation in butterfly valves. In this study, LES and the Zwart model were used as the turbulence and cavitation models, respectively, to simulate cavitation through a butterfly valve. The influence of the valve opening degree and inlet flow velocity on dynamic cavitation through the butterfly valve were studied. Furthermore, the cavitated flow field was examined, along with the performance coefficients of the butterfly valve. With the increase in the incoming flow velocity, the high-speed jet zone over a large-range and low-pressure zone appeared inside the downstream of butterfly valve, which affected its stability and the cavitation generation through the valve. Furthermore, the flow coefficient decreased with the increase in vapor volume. In addition, the results indicated that cavitation was more easily induced for smaller valve opening degrees, and the interaction between cavitation and solid walls was stronger. Due to the existence of cavitation, the flow characteristics of butterfly valves are seriously affected.

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“…Cavitation, a common fluid mechanics phenomenon, refers to the microbubbles' (also known as nuclei) explosive growth resulting from liquid evaporation caused by local low pressure (i.e., the pressure is lower than the saturated vapor pressure at the corresponding temperature) in a liquid flow system, which is particularly common among various hydraulic turbines, pumps, and ship propellers [1][2][3]. Tip vortex cavitation, the earliest type of cavitation that occurs on real ship propellers due to the scale effect [4], will lead to significant pulsating pressure and strong radiation noise, degrading the ship's stealth performance significantly [5,6].…”

Section: Introductionmentioning

confidence: 99%

Numerical Method to Determine the Inception of Propeller Tip Vortex Cavitation Based on Bubble Dynamics

Duan,

Xu,

Cui

et al. 2024

Applied Sciences

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Due to the scale effect, tip vortex cavitation (TVC) is the earliest type of cavitation that occurs on real ship propellers. As a result, experts in the ship field have been paying close attention to the accurate prediction of propeller TVC inception for a long time. The motion and growth of the microscopic nuclei in the water have a significant influence on TVC inception. However, the minimum pressure coefficient method—a common method at present—based on the traditional Eulerian framework, neglects the influence of microscopic nuclei and therefore cannot accurately predict the cavitation inception. Moreover, the numerical prediction method for cavitation inception, which is based on bubble dynamics models and considers the influence of nuclei, has not established a set of unified and specific discrimination criteria applicable to propeller cavitation inception. In order to make up for the shortcomings of traditional prediction models and the existing methods based on bubble dynamics in the prediction of TVC inception, we propose a new discrimination method for propeller TVC inception based on bubble dynamics in this paper. The comparison with experimental results demonstrates that our proposed method allows us to predict propeller TVC inception more accurately. In addition, the effect mechanism of tip vortex flow characteristics on nuclei evolution is further investigated, and it is found that when approaching the low-pressure region at a vortex core under the influence of tip vortex suction, nuclei grow explosively under the continuous action of the low pressure at the vortex core until they reach their maximum sizes and then collapse rapidly.

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Collapsing characteristics of gas-bearing cavitation bubble

Cited by 11 publications

References 31 publications

Design and Analysis of the Multifunctional Oil-Injection Equipment for Deep-Sea Hydraulic Systems

Design and Analysis of the Multifunctional Oil-Injection Equipment for Deep-Sea Hydraulic Systems

Numerical Study of Cavitation Characteristics through Butterfly Valve under Different Regulation Conditions

Numerical Method to Determine the Inception of Propeller Tip Vortex Cavitation Based on Bubble Dynamics

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