Numerical Study of the Collapse of Multiple Bubbles and the Energy Conversion during Bubble Collapse

Zhang, Jing; Zhang, Lingxin; Deng, Jian

doi:10.3390/w11020247

Cited by 29 publications

(14 citation statements)

References 42 publications

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“…1 [73]) or the shock wave energy (E SW ) generated from bubble collapse (eq. 2 [74]) need not only to exceed the friction force but to also move the particle away from the membrane.…”

Section: Effects Of Ultrasound On Foulingmentioning

confidence: 99%

Ultrasound-assisted membrane technologies for fouling control and performance improvement: A review

Naji

Al-Juboori

Khan

et al. 2021

Journal of Water Process Engineering

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Membrane separation is widely used in wastewater treatment and desalination due to its high performance and ability to handle feed solutions of different qualities. Despite vast history of success, membrane fouling remains a major system deficiency that imposes substantial process limitations by reducing permeate production and increasing energy demand. Besides, chemical cleaning-in-place (CIP) adversely affects membrane integrity and generates an extra waste stream. Ultrasound (US) is a relatively new cleaning technique that improves process performance by mitigating fouling accumulation at a membrane surface and improving permeate flux by promoting mass and heat transfer. US-assisted membrane processes is an efficient method for fouling reduction and significant flux improvement. This study comprehensively reviews US applications in pressure-, thermally-and osmotic-driven membrane technologies and their impact on process performance. It also explores the impact of US operating conditions on membrane separation properties and how these parameters can be tuned to achieve the desirable outcome. To date, the application of US in membrane technologies is limited to laboratory tests. In the authors opinion, there is a niche market for US-assisted membrane technology in heavily contaminated water such as wastewater and brine. After critical analysis of the literature, we found that there are still several aspects of the process need to be scrutinized carefully to make an adequate evaluation of its feasibility on an industrial scale. The most urgent one is the techno-economic evaluation of the technology based on large-scale and long-term tests. The study proposed a set of recommendations for future research directions of US applications in membrane technologies.

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“…1 [73]) or the shock wave energy (E SW ) generated from bubble collapse (eq. 2 [74]) need not only to exceed the friction force but to also move the particle away from the membrane.…”

Section: Effects Of Ultrasound On Foulingmentioning

confidence: 99%

Ultrasound-assisted membrane technologies for fouling control and performance improvement: A review

Naji

Al-Juboori

Khan

et al. 2021

Journal of Water Process Engineering

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show abstract

“…However, a consensus has not yet been reached for the mechanism of energy conversion during collapse. Zhang et al believe that the energy of a bubble is transformed into the wave energy of its fluid, causing an impact on a solid wall [24]. Qin found that when a bubble collapses, there is a large amount of heat transfer and energy exchange between the bubble and the outside [23].…”

Section: Bubble At the Wallmentioning

confidence: 99%

“…Shockwave pressure causing cavitation erosion on a solid wall is a concerning issue. Zhang showed that during the collapse of a single bubble, the greatest impact on the wall is the p 2ndmax , which is caused when the bubble is completely collapsed [24]. For laserinduced thermal cavitation bubbles, the initial input energy will also cause extremely highpressure shock p 1stmax .…”

Section: Bubble At the Wallmentioning

confidence: 99%

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Growth and Collapse Dynamics of a Vapor Bubble near or at a Wall

Wang

Zhang

Xiong

2020

Water

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This study investigated the dynamics of vapor bubble growth and collapse for a laser-induced bubble. The smoothed particle hydrodynamics (SPH) method was utilized, considering the liquid and vapor phases as the van der Waals (VDW) fluid and the solid wall as a boundary. We compared our numerical results with analytical solutions of bubble density distribution and radius curve slope near a wall and the experimental bubble shape at a wall, which all obtained a fairly good agreement. After validation, nine cases with varying heating distances (L2 to L4) or liquid heights (h2 to h10) were simulated to reproduce bubbles near or at a wall. Average bubble radius, density, vapor mass, velocity, pressure, and temperature during growth and collapse were tracked. A new recognition method based on bubble density was recommended to distinguish the three substages of bubble growth: (a) inertia-controlled, (b) transition, and (c) thermally controlled. A new precollapse substage (Stage (d)) was revealed between the three growth stages and collapse stage (Stage (e)). These five stages were explained from the out-sync between the bubble radius change rate and vapor mass change rate. Further discussions focused on the occurrence of secondary bubbles, shockwave impact on the wall, system entropy change, and energy conversion. The main differences between bubbles near and at the wall were finally concluded.

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“…For example, Zhang et al . [12] studied the conversion relationship between cavitation bubble potential energy and wave energy during the collapse of cavitation bubbles near the wall. Han et al .…”

Section: Introductionmentioning

confidence: 99%

An equivalent method of jet impact loading from collapsing near-wall acoustic bubbles: A preliminary study

Lü

Chen

Dong

et al. 2021

Ultrasonics Sonochemistry

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Cavitation damage is a micro, high-speed, multi-phase complex phenomenon caused by the near-wall bubble group collapse. The current numerical simulation method of cavitation mainly focuses on the collapse impact of a single cavitation bubble. The large-scale simulation of the cavitation bubble group collapse is difficult to perform and has not been studied, to the best of our knowledge. In this study, the equivalent model of impact loading of acoustic bubble collapse micro-jets is proposed to study the cavitation erosion damage of materials. Based on the theory of the micro-jet and the water hammer effect of the liquid–solid impact, an equivalent model of impact loading of a single acoustic bubble collapse micro-jet is established under the principle of deformation equivalence. Since the acoustic bubbles can be considered uniformly distributed in a small enough area, an equivalent model of impact loading of multiple acoustic bubble collapse micro-jets in a micro-segment can be derived based on the equivalent results of impact loading of a single acoustic bubble collapse micro-jet. In fact, the equivalent methods of cavitation damage loading for single and multiple near-wall acoustic bubble collapse micro-jets are formed. The verification results show the law of cavitation deformation of concrete using equivalent loading is consistent with that of a micro-jet simulation, and the average relative errors and the mean square errors are insignificant. The equivalent method of impact loading proposed in this paper has high accuracy and can greatly improve the calculation efficiency, which provides technical support for numerical simulation of concrete cavitation.

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Numerical Study of the Collapse of Multiple Bubbles and the Energy Conversion during Bubble Collapse

Cited by 29 publications

References 42 publications

Ultrasound-assisted membrane technologies for fouling control and performance improvement: A review

Ultrasound-assisted membrane technologies for fouling control and performance improvement: A review

Growth and Collapse Dynamics of a Vapor Bubble near or at a Wall

An equivalent method of jet impact loading from collapsing near-wall acoustic bubbles: A preliminary study

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