Impulsive Forces Generated by Tandem Cavitation Bubble on Solid Wall

2021 ◽  
Author(s):  
NyoMe Thet Naing ◽  
Rho-Taek Jung
Keyword(s):  
Cavitation Bubble ◽  
Solid Wall ◽  
Impulsive Forces

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.

scholarly journals Design of experimental setup for investigation of cavitation bubble collapse close to a solid wall

2012 ◽  
Vol 25 ◽  
pp. 02017
Author(s):  
Miloš Müller ◽  
Patrik Zima ◽  
Jiří Unger ◽  
Martin Živný
Keyword(s):  
Cavitation Bubble ◽  
Solid Wall ◽  
Bubble Collapse ◽  
Experimental Setup

scholarly journals Erosion Mechanism of a Cavitating Jet on Groove Roughness

Fluids ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. 6
Author(s):  
Nobuyuki Fujisawa ◽  
Takayuki Yamagata ◽  
Ryotaro Seki ◽  
Motofumi Ohki
Keyword(s):  
Mass Loss ◽  
Cavitation Bubble ◽  
Intensity Fluctuation ◽  
Observation Time ◽  
Time Resolved ◽  
Focusing Effect ◽  
Erosion Mechanism ◽  
Impulsive Forces ◽  
Flow Visualizations ◽  
Cavitating Jet

The erosion behavior of a cavitating jet on groove roughness was investigated experimentally using mass-loss characteristics, scanning electron microscopy (SEM) observation, time-resolved shadowgraph, and schlieren flow visualizations. The wall morphology of the cavitating-jet erosion on the groove roughness indicated an increased mass loss, which was highly increased along the groove rather than across the groove. Furthermore, increased erosion pits were observed on the groove bottom along the grooves. The shadowgraph imaging of the cavitating jet on the rough wall showed noncircular cavitation bubble distributions along and across the grooves, which corresponds to the increased number of cavitation bubbles along the grooves and the decreased number of bubbles across the grooves. This result is consistent with the erosion morphology of the groove roughness. Schlieren imaging indicated that the frequency and intensity fluctuation of the shockwave formation did not change significantly on the groove roughness along and across the grooves. The findings in the study show that the increased erosion mechanism on groove roughness is caused by the increased number of impulsive forces and the shockwave focusing effect on the groove bottom.

Interaction between a cavitation bubble and shear flow

2010 ◽  
Vol 651 ◽  
pp. 93-116 ◽  
Author(s):  
SADEGH DABIRI ◽  
WILLIAM A. SIRIGNANO ◽  
DANIEL D. JOSEPH
Keyword(s):  
Cavitation Bubble ◽  
Stokes Equations ◽  
Liquid Velocity ◽  
Solid Wall ◽  
Three Dimensional ◽  
Navier Stokes ◽  
Quadrupole Moments ◽  
Navier Stokes Equations ◽  
Flow Effects ◽  
Two Sides

The deformation of a cavitation bubble in shear and extensional flows is studied numerically. The Navier–Stokes equations are solved to observe the three-dimensional behaviour of the bubble as it grows and collapses. During the collapse phase of the bubble, two re-entrant jets are observed on two sides of the bubble. The re-entrant jets are not the result of interaction with a solid wall or free surface; rather, they are formed due to interaction of the bubble with the background flow. Effects of the viscosity, surface tension and shear rate on the formation and strength of re-entrant jets are investigated. Re-entrant jets with enough strength break up the bubble into smaller bubbles. Post-processing and analysis of the results are done to cast the disturbance by the bubble on the liquid velocity field in terms of spherical harmonics. It is found that quadrupole moments are created in addition to the monopole source.

Collapse of a spheroidal cavitation bubble near a solid wall

2016 ◽  
Vol 59 (2) ◽  
pp. 190-196
Author(s):  
A. A. Aganin ◽  
M. A. Il’gamov ◽  
L. A. Kosolapova ◽  
V. G. Malakhov
Keyword(s):  
Cavitation Bubble ◽  
Solid Wall
Sign in / Sign up

Export Citation Format

Share Document