Study on the Sand-Scouring Characteristics of Pulsed Submerged Jets Based on Experiments and Numerical Methods

Wang, Hongliang; Jia, Xuanwen; Wang, Chuan; Hu, Bo; Cao, Weidong; Li, Shanshan; Wang, Hui

doi:10.3390/jmse12010057

Cited by 5 publications

(2 citation statements)

References 20 publications

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“…Positioned at the forefront of technological advancements, cavitation bubble technology finds primary applications in sectors including ships, chemical industries, medicine, and other fields. The water jet-induced cavitation bubble, recognized for its extensive impact range, high efficiency, and eco-friendliness, is extensively utilized in ship maintenance and chemical equipment cleaning [1][2][3][4][5][6]. In medicine, ultrasound-induced cavitation bubbles are used in cancer treatment, stone crushing, and gingival surgery owing to their small impact area and large impact force [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Laser-Induced Cavitation Bubbles near Wall: Plasma Shielding Observation

Zhou,

Li,

Cao

et al. 2024

Water

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To investigate the plasma shielding of laser-induced cavitation bubbles near a wall, a pulsed laser with different energies was selected to induce cavitation bubbles on the surface of 7050-T7451 aluminum alloy. A high-speed camera captured the evolution of the cavitation bubble, while a fiber-optic hydrophone system collected the acoustic signals during the evolution. Finally, a confocal microscope was used to view and analyze the surface morphology of 7050 aluminum alloy. The experimental results indicate that as the laser energy increases, the diameter, the evolution time, the pressure of the bubble, and both the pit diameter and depth all increase. Beyond an energy level of 1.4 J, the maximum diameter and the evolution time of the laser-induced cavitation bubble begin to decrease; the maximum diameter decreases by 2.04%, and the first evolution time decreases by 3.26%. Plasma shielding was observed in this experiment. Considering that the essence of a laser-induced cavitation bubble is the interaction between a high-energy laser and a liquid medium, the abnormal decrease in the maximum diameter, evolution time, and sound pressure epitomizes the manifestation of plasma shielding.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of Laser-Induced Cavitation Bubbles near Wall: Plasma Shielding Observation

Zhou,

Li,

Cao

et al. 2024

Water

View full text Add to dashboard Cite

show abstract

“…However, this technology still has drawbacks, including large dimple sizes and high energy dissipation [7]. The application of cavitation water jet peening (CWJP) involves generating cavitation bubbles through the shearing effect of a high-speed water jet in an artificially submerged environment, leading to material removal [8][9][10]. Research conducted by Han et al [11] suggested that due to the inclination error in vertical jetting, uneven removal depths were observed in the pits generated during the immersion-based pulsed cavitation jet peening process.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Near-Wall Laser-Induced Cavitation Bubble Micro-Dimple Formation on 7050 Aluminum Alloy

Cao,

Hu,

Shi

et al. 2024

Water

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To investigate the feasibility and formation laws of fabricating micro-dimples induced by near-wall laser-induced cavitation bubble (LICB) on 7050 aluminum alloy. A high-speed camera and a fiber-optic hydrophone system were used to capture pulsation evolution images and acoustic signals of LICB. Meanwhile, a three-dimensional profilometer was employed to examine the contour morphology of the surface micro-dimple on the specimen. The results show that at an energy level of 500 mJ, the total pulsation period for the empty bubble is 795 μs, with individual pulsation periods of 412.5 μs, 217 μs, and 165 μs for the first, second, and third cycles, respectively, with most energy of the laser and bubble being consumed during the first evolution period. Under the synergy of the plasma shock wave and collapse shock wave, a spherical dimple with a diameter of 450 μm is formed on the sample surface with copper foil as the absorption layer. A model of micro-dimple formed by LICB impact is established. As the energy increases, the depth of the surface micro-dimple peaks at an energy of 400 mJ and then decreases. The depth of the surface micro-dimple increases with the increase in the number of impacts; the optimal technology parameters for the micro-dimple formation by LICB impact are as follows: the absorption layer is copper foil, the energy is 400 mJ, and the number of impacts is three.

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Numerical study of the self‐priming process of a prototype pump based on coupled calculations of circulatory system

Zhang,

Li,

Zhao

et al. 2024

Energy Science & Engineering

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To understand the self‐priming characteristics of a self‐priming pump, a closed‐loop piping system that includes the self‐priming pump, valve, tank, and piping system is established. The acceleration–constant speed operation processes of the impeller are controlled through a user‐defined function that ensures that the computational model and startup conditions are consistent with the real situation. Based on numerical calculations of the self‐priming process with two different self‐priming heights, the gas–liquid distributions during the self‐priming startup process are obtained. The results show that the self‐priming startup process can be divided into three stages: rapid inhalation, oscillating exhaust, and accelerated exhaust. Under the two self‐priming heights, the time required for the rapid inhalation and accelerated exhaust stages is basically the same. Thus, the difference in self‐priming time is mainly concentrated in the oscillating exhaust stage. The rate at which the liquid level rises in the vertical pipe is not proportional to the self‐priming height, and the difference in the self‐priming time is not proportional to the change in the self‐priming height.

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Study on the Sand-Scouring Characteristics of Pulsed Submerged Jets Based on Experiments and Numerical Methods

Cited by 5 publications

References 20 publications

Experimental Study of Laser-Induced Cavitation Bubbles near Wall: Plasma Shielding Observation

Experimental Study of Laser-Induced Cavitation Bubbles near Wall: Plasma Shielding Observation

Experimental Study on Near-Wall Laser-Induced Cavitation Bubble Micro-Dimple Formation on 7050 Aluminum Alloy

Numerical study of the self‐priming process of a prototype pump based on coupled calculations of circulatory system

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