On the criteria of large cavitation bubbles in a tube during a transient process

Xu, Pei; Liu, Shuhong; Zuo, Zhigang; Pan, Zhao

doi:10.1017/jfm.2021.114

Cited by 21 publications

(24 citation statements)

References 18 publications

(22 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The tube-arrest setup used in the research is adapted from previous research of the authors [8] and is schematically presented in figure 1. A conical-frustum shaped acrylic tube filled with deionized water is driven upwards by stepping on the actuator until it hits on the buffer.…”

Section: Methodsmentioning

confidence: 99%

“…Numerical simulations supported by experimental indicate that the oscillation period and size of the cavitation bubble are related to the initial flow velocity [3,4]. At the laboratory setup, the tube-arrest method has been used to produce the transient cavitation bubbles in a cylindrical tube [6,7,8]. The results suggest that the size of the bubble is related to the velocity of the tube [6,7] and a Rayleigh-type model for the dynamics of the large bubble is put forward [8].…”

Section: Introductionmentioning

confidence: 99%

“…At the laboratory setup, the tube-arrest method has been used to produce the transient cavitation bubbles in a cylindrical tube [6,7,8]. The results suggest that the size of the bubble is related to the velocity of the tube [6,7] and a Rayleigh-type model for the dynamics of the large bubble is put forward [8]. Besides, numerical simulations have been carried out to simulate the transient flow and vapor cavity during the valve closing process in a draft tube, suggesting that the deceleration valve closing method can reduce the impact of water hammer [9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental transient cavitation bubbles in a conical-frustum shaped tube

Wang

Liu

Zuo

et al. 2022

J. Phys.: Conf. Ser.

Self Cite

View full text Add to dashboard Cite

Extreme flow acceleration in the water can induce large cavitation bubbles in the hydraulic machinery, and cause liquid column separations in the pipeline. The abrupt collapse of these large bubbles produces strong pressure oscillation and causes catastrophic destruction instantaneously. Considering the complexity of the shapes of pipelines in engineering, we experimentally study the transient bubble dynamics in a conical-frustum shaped tube by a modified tube-arrest method in the present paper. Three shapes of cavitation bubbles are observed during the transient processes: (A) conical-frustum shaped bubbles originated from the bottom; (B) hemispherical bubbles originated from the side wall; (C) conical-frustum shaped bubbles originated from the liquid bulk. It is seen that the locations of the cavitation bubbles strongly depend on the geometries and the surface roughness of the tube, and the nucleation status of the bulk liquid.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental transient cavitation bubbles in a conical-frustum shaped tube

Wang

Liu

Zuo

et al. 2022

J. Phys.: Conf. Ser.

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, due to the destructive nature of the phenomena 5,6,18 , systematical experimental studies using circulating pipe system remain difficult and limited. In contrast, the so-called 'tube-arrest' method provides an equivalent and low-cost experimental technique for the study of cavitation bubbles during the transient process [19][20][21] . In a tube-arrest setup, a tube filled with liquid is driven upwards until it impacts with a buffer, causing rapid liquid deceleration and inducing cavitation bubbles at the bottom of the tube.…”

Section: Introductionmentioning

confidence: 99%

“…In a tube-arrest setup, a tube filled with liquid is driven upwards until it impacts with a buffer, causing rapid liquid deceleration and inducing cavitation bubbles at the bottom of the tube. Based on the experiments in a tube-arrest apparatus, Xu et al 21 proposed the onset criteria of large cavitation bubbles generated at the close end of the cylindrical tube. They found that the large cylindrical bubbles collapse at a finite speed, and the collapse time can be estimated by a newly established Rayleigh-type model.…”

Section: Introductionmentioning

confidence: 99%

Large cavitation bubbles in the tube with a conical-frustum shaped closed end during a transient process

Wang

Liu

et al. 2022

Physics of Fluids

Self Cite

View full text Add to dashboard Cite

The transient process accompanied by extreme acceleration in the conical sections of hydraulic systems (e.g., draft tube, diffuser) can induce large cavitation bubbles both at the closed ends and in the bulk liquid. The collapses of the large cavitation bubbles can cause severe damage to the solid walls. We conduct experiments in the tubes with different conical-frustum shaped closed ends with the `tube-arrest' method and observe bubbles generated at these two locations. For the bubbles generated at the close end of the tube, we propose the onset criteria, consisting of two universal non-dimensional parameters Ca1 and Ca2, of large cavitation bubbles separating the water column. We investigate their dynamics including the collapse time and speed. The results indicate that the larger the conical angle, the faster the bubbles collapse. For the bubbles generated in the bulk liquid, we numerically study the collapse time, the jet characteristics and the pressure pulse at bubble collapse. We observe a much stronger jet and pressure pulse of bubbles in tubes, comparing with a bubble near an infinite plate. Our results can provide guidance in the design and safe operation of hydraulic machinery with complex geometries, considering the cavitation during the transient process.

show abstract

Impact-driven cavitation bubble dynamics

et al. 2023

View full text Add to dashboard Cite

The dynamics of a single cavitation bubble exposed to a transient acceleration is studied experimentally. A single cavitation bubble is seeded with a pulsed laser in a free-falling and impacting water-filled test tube. After impact, a pressure wave containing compression and rarefaction phases is generated and interacts with the bubble. The bubble dynamics is studied with high-speed imaging and compared to numerical simulations using the Keller–Miksis model. The timing of bubble seeding with respect to the pressure wave is varied, and a regime of enhanced collapse strength is found.

show abstract

On the criteria of large cavitation bubbles in a tube during a transient process

Abstract: Abstract

Cited by 21 publications

References 18 publications

Experimental transient cavitation bubbles in a conical-frustum shaped tube

Experimental transient cavitation bubbles in a conical-frustum shaped tube

Large cavitation bubbles in the tube with a conical-frustum shaped closed end during a transient process

Impact-driven cavitation bubble dynamics

Contact Info

Product

Resources

About