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

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 247 ◽  
Author(s):  
Jing Zhang ◽  
Lingxin Zhang ◽  
Jian Deng
Keyword(s):  
Energy Conversion ◽  
Conversion Rate ◽  
Focal Point ◽  
Numerical Study ◽  
Solid Wall ◽  
Bubble Collapse ◽  
Liquid Interfaces ◽  
Acoustic Damping ◽  
Multiple Bubbles ◽  
Peak Value

This paper investigates numerically the collapses of both a single cavitation bubble and a cluster consisting of 8 bubbles, concerning mainly on the conversions between different forms of energy. Direct numerical simulation (DNS) with volume of fluid (VOF) method is applied, considering the detailed resolution of the vapor-liquid interfaces. First, for a single bubble near a solid wall, we find that the peak value of the wave energy, or equivalently the energy conversion rate decreases when the distance between the bubble and the wall is reduced. However, for the collapses of multiple bubbles, this relationship between the bubble-wall distance and the conversion rate reverses, implying a distinct physical mechanism. The evolutions of individual bubbles during the collapses of multiple bubbles are examined. We observe that when the bubbles are placed far away from the solid wall, the jetting flows induced by all bubbles point towards the cluster centre, while the focal point shifts towards the solid wall when the cluster is very close to the wall. We note that it is very challenging to consider thermal and acoustic damping mechanisms in the current numerical methods, which might be significant contributions to the energy budget, and we leave it open to the future studies.

Numerical study of the shock wave and pressure induced by single bubble collapse near planar solid wall

2021 ◽  
Vol 33 (7) ◽  
pp. 073311
Author(s):  
Xiaobin Yang ◽  
Cheng Liu ◽  
Decheng Wan ◽  
Changhong Hu
Keyword(s):  
Shock Wave ◽  
Numerical Study ◽  
Solid Wall ◽  
Single Bubble ◽  
Bubble Collapse

Study on bubble collapse near a solid wall under different hypergravity environments

2021 ◽  
Vol 221 ◽  
pp. 108563
Author(s):  
Liangtao Liu ◽  
Ning Gan ◽  
Jinxiang Wang ◽  
Yifan Zhang
Keyword(s):  
Solid Wall ◽  
Bubble Collapse

scholarly journals Phenomenology of bubble-collapse-driven penetration of biomaterial-surrogate liquid-liquid interfaces

2018 ◽  
Vol 3 (11) ◽  
Author(s):  
Shucheng Pan ◽  
Stefan Adami ◽  
Xiangyu Hu ◽  
Nikolaus A. Adams
Keyword(s):  
Bubble Collapse ◽  
Liquid Interfaces

Numerical Study on the Effect of Inner Tube Position on Heat Transfer Process in Self-Recuperative Radiant Tube

2011 ◽  
Vol 228-229 ◽  
pp. 676-680 ◽  
Author(s):  
Ye Tian ◽  
Xun Liang Liu ◽  
Zhi Wen
Keyword(s):  
Heat Transfer ◽  
Transfer Process ◽  
Numerical Study ◽  
Flame Temperature ◽  
Three Dimensional ◽  
Mathematic Model ◽  
Heat Transfer Process ◽  
Bulk Temperature ◽  
Radiant Tube ◽  
Peak Value

A three-dimensional mathematic model is developed for a 100kw single-end recuperative radiant tube and the simulation is performed with the CFD software FLUENT. Also it is used to investigate the effect of distance between combustion chamber exit and inner tube on heat transfer process. The results suggest that the peak value of combustion flame temperature drops along with the increasing of distance, which leads to low NOX discharging. Also radiant tube surface bulk temperature decreases, which causes radiant tube heating performance losses.

Modeling of collapsing cavitation bubble near solid wall by 3D pseudopotential multi-relaxation-time lattice Boltzmann method

2017 ◽  
Vol 232 (3) ◽  
pp. 445-456 ◽  
Author(s):  
Minglei Shan ◽  
Yu Yang ◽  
Hao Peng ◽  
Qingbang Han ◽  
Changping Zhu
Keyword(s):  
Relaxation Time ◽  
Lattice Boltzmann ◽  
Cavitation Bubble ◽  
Solid Wall ◽  
Three Dimensional ◽  
Lattice Boltzmann Model ◽  
Bubble Collapse ◽  
Lattice Boltzmann Simulation ◽  
Boltzmann Method ◽  
Boltzmann Model

Understanding the dynamic characteristic of the cavitation bubble near a solid wall is a fundamental issue for the bubble collapse application and prevention. In the present work, an improved three-dimensional multi-relaxation-time pseudopotential lattice Boltzmann model is adopted to investigate the cavitation bubble collapse near the solid wall. With respect to thermodynamic consistency, Laplace law verification, the three-dimensional pseudopotential multi-relaxation-time lattice Boltzmann model is investigated. By the theoretical analysis, it is proved that the model can be regarded as a solver of the Rayleigh–Plesset equation, and confirmed by comparing the results of the lattice Boltzmann simulation and the Rayleigh–Plesset equation calculation for the case of cavitation bubble collapse in the infinite medium field. The bubble collapse near the solid wall is modeled using the improved pseudopotential multi-relaxation-time lattice Boltzmann model. We find the lattice Boltzmann simulation and the experimental results have the same dynamic process by comparing the bubble profiles evolution. Form the pressure field and the velocity field evolution it is found that the tapered higher pressure region formed near the top of the bubble is a crucial driving force inducing the bubble collapse. This exploratory research demonstrates that the lattice Boltzmann method is an alternative tool for the study of the interaction between collapsing cavitation bubble and matter.

Effect of Coil Parameters on Rivet Deformation in Low Voltage Electromagnetic Riveting

2012 ◽  
Vol 602-604 ◽  
pp. 1887-1890
Author(s):  
Jiang Hua Deng ◽  
Chao Tang ◽  
Yi Ming Zheng ◽  
Yan Ran Zhan
Keyword(s):  
Energy Conversion ◽  
Cross Section ◽  
Discharge Current ◽  
Conversion Rate ◽  
Low Voltage ◽  
Current Amplitude ◽  
Deformation Degree ◽  
Section Size ◽  
Wire Cross Section ◽  
Electromagnetic Riveting

Electromagnetic riveting is a kind of energy conversion technology and forming coil is the key component of energy conversion. Coil parameters include the turns and wire cross section size. The effects of coil parameters on discharge current, riveting force, rivet deformation degree and energy conversion rate were investigated by experimental method in low voltage electromagnetic riveting. The results show that with the coil turns increasing, coil inductance increases, discharge current amplitude decreases, cycle increases, rivet deformation degree increases and the energy conversion rate improves when the coil wire cross section size is the same. And with the coil wire width increasing, the coil resistance decreases, discharge current amplitude increases, rivet deformation degree increases and the energy conversion rate improves when the coil turns is same. By rational design of coil turns and wire section size, low voltage electromagnetic riveting is an effective way to realize deformation of strain rate sensitive material TA1 rivets.

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