Bubble collapse and liquid jet formation in non-newtonian liquids

AIChE Journal ◽  
1999 ◽  
Vol 45 (12) ◽  
pp. 2653-2656 ◽  
Author(s):  
S. W. J. Brown ◽  
P. R. Williams
Keyword(s):  
Bubble Collapse ◽  
Liquid Jet ◽  
Jet Formation ◽  
Newtonian Liquids

Bubble collapse and jet formation inside a liquid film

2021 ◽  
Vol 33 (11) ◽  
pp. 112102
Author(s):  
Ehsan Mahravan ◽  
Daegyoum Kim
Keyword(s):  
Liquid Film ◽  
Bubble Collapse ◽  
Jet Formation

Liquid jet formation during a suspended liquid suction process

2020 ◽  
Vol 114 ◽  
pp. 109952
Author(s):  
Liang Hu ◽  
Hanghang Xu ◽  
Mingbo Li ◽  
Weiting Liu ◽  
Wenyu Chen ◽  
...  
Keyword(s):  
Liquid Jet ◽  
Jet Formation

scholarly journals Conserved quantities for axisymmetric cavities near boundaries

1990 ◽  
Vol 41 (2) ◽  
pp. 215-222
Author(s):  
R. Paull ◽  
J.R. Blake
Keyword(s):  
Perfect Fluid ◽  
Volume Change ◽  
Global Model ◽  
Bubble Collapse ◽  
Conserved Quantities ◽  
Jet Formation ◽  
Rigid Boundary ◽  
Cavity Collapse ◽  
Conservation Principles ◽  
Axisymmetric Cavities

In axisymmetric irrotational flows of a perfect fluid under gravity there are three basic conserved quantities; axial momentum, energy and a circulation based, radial moment of momentum. This paper adapts these conservation principles to describe cavity collapse adjacent to a rigid boundary in a semi-infinite perfect fluid. They afford a global model accounting for volume change, migration and jet formation; physically the most significant features of bubble collapse close to a rigid boundary.

Cinematographic Analysis of Counter Jet Formation in a Single Cavitation Bubble Collapse Flow

2011 ◽  
Vol 27 (2) ◽  
pp. 253-266 ◽  
Author(s):  
S.-H. Yang ◽  
S.-Y. Jaw ◽  
K.-C. Yeh
Keyword(s):  
Flow Field ◽  
Cavitation Bubble ◽  
Pressure Wave ◽  
Bubble Surface ◽  
Bubble Collapse ◽  
Solid Boundary ◽  
Liquid Jet ◽  
Pressure Waves ◽  
Field Variation ◽  
Critical Position

ABSTRACTThis study utilized a U-shape platform device to generate a single cavitation bubble for the detail analysis of the flow field characteristics and the cause of the counter jet during the process of bubble collapse induced by pressure wave. A series of bubble collapse flows induced by pressure waves of different strengths are investigated by positioning the cavitation bubble at different stand-off distances to the solid boundary. It is found that the Kelvin-Helmholtz vortices are formed when the liquid jet induced by the pressure wave penetrates the bubble surface. If the bubble center to the solid boundary is within one to three times the bubble's radius, a stagnation ring will form on the boundary when impacted by the penetrated jet. The liquid inside the stagnation ring is squeezed toward the center of the ring to form a counter jet after the bubble collapses. At the critical position, where the bubble center from the solid boundary is about three times the bubble's radius, the bubble collapse flows will vary. Depending on the strengths of the pressure waves applied, either just the Kelvin-Helmholtz vortices form around the penetrated jet or the penetrated jet impacts the boundary directly to generate the stagnation ring and the counter jet flow. This phenomenon used the particle image velocimetry method can be clearly revealed the flow field variation of the counter jet. If the bubble surface is in contact with the solid boundary, the liquid jet can only splash radially without producing the stagnation ring and the counter jet. The complex phenomenon of cavitation bubble collapse flows are clearly manifested in this study.

scholarly journals Effects of a water hammer and cavitation on jet formation in a test tube

2015 ◽  
Vol 787 ◽  
pp. 224-236 ◽  
Author(s):  
Akihito Kiyama ◽  
Yoshiyuki Tagawa ◽  
Keita Ando ◽  
Masaharu Kameda
Keyword(s):  
Pressure Wave ◽  
Flow Analysis ◽  
Water Hammer ◽  
Test Tube ◽  
Liquid Interface ◽  
Phase Changes ◽  
Liquid Jet ◽  
Jet Formation ◽  
Wave Interactions ◽  
The One

We investigate the motion of a gas–liquid interface in a test tube induced by a large acceleration via impulsive force. We conduct simple experiments in which the tube partially filled with a liquid falls under gravity and hits a rigid floor. A curved gas–liquid interface inside the tube reverses and eventually forms a so-called focused jet. In our experiments, there arises either vibration of the interface or an increment in the velocity of the liquid jet, accompanied by the onset of cavitation in the liquid column. These phenomena cannot be explained by a considering pressure impulse in a classical potential flow analysis, which does not account for finite speeds of sound or phase changes. Here we model such water-hammer events as a result of the one-dimensional propagation of a pressure wave and its interaction with boundaries through acoustic impedance mismatching. The method of characteristics is applied to describe pressure-wave interactions and the subsequent cavitation. The model proposed is found to be able to capture the time-dependent characteristics of the liquid jet.

The shape of low-speed capillary jets of Newtonian liquids

1966 ◽  
Vol 25 (1) ◽  
pp. 185-198 ◽  
Author(s):  
Simon L. Goren ◽  
Stanislaw Wronski
Keyword(s):  
Reynolds Number ◽  
Quantitative Agreement ◽  
Jet Formation ◽  
Final State ◽  
Theoretical Approaches ◽  
Exponential Decay Rate ◽  
Layer Analysis ◽  
Capillary Jets ◽  
Newtonian Liquids ◽  
Jet Shapes

The shape of a jet of Newtonian liquid issuing from a capillary needle into air is considered. The results of two theoretical approaches are presented. One approach is a perturbation analysis about the final state of the jet and the other is a boundary-layer analysis near the point of jet formation. Comparison of the predictions with experimental jet shapes shows them to be in semi-quantitative agreement. Especially interesting is the presence of a ‘discontinuity’ in the empirical exponential decay rate of the jet radius occurring at a Reynolds number somewhere between 14 and 20 and the correspondence of this discontinuity with the peculiar behaviour in this range of the Reynolds number of the theoretical eigenvalue.

On the scaling of jetting from bubble collapse at a liquid surface

2017 ◽  
Vol 822 ◽  
pp. 791-812 ◽  
Author(s):  
Sangeeth Krishnan ◽  
E. J. Hopfinger ◽  
Baburaj A. Puthenveettil
Keyword(s):  
Power Law ◽  
Scaling Laws ◽  
Liquid Surface ◽  
Limited Range ◽  
Capillary Waves ◽  
Bubble Collapse ◽  
Jet Formation ◽  
Cavity Depth ◽  
Jet Breakup ◽  
Jet Velocity

We present scaling laws for the jet velocity resulting from bubble collapse at a liquid surface which bring out the effects of gravity and viscosity. The present experiments conducted in the range of Bond numbers $0.004<Bo<2.5$ and Ohnesorge numbers $0.001<Oh<0.1$ were motivated by the discrepancy between previous experimental results and numerical simulations. We show here that the actual dependence of $We$ on $Bo$ is determined by the gravity dependency of the bubble immersion (cavity) depth which has no power-law variation. The power-law variation of the jet Weber number, $We\sim 1/\sqrt{Bo}$, suggested by Ghabache et al. (Phys. Fluids, vol. 26 (12), 2014, 121701) is only a good approximation in a limited range of $Bo$ values ($0.1<Bo<1$). Viscosity enters the jet velocity scaling in two ways: (i) through damping of precursor capillary waves which merge at the bubble base and weaken the pressure impulse, and (ii) through direct viscous damping of the jet formation and dynamics. These damping processes are expressed by a dependence of the jet velocity on Ohnesorge number from which critical values of $Oh$ are obtained for capillary wave damping, the onset of jet weakening, the absence of jetting and the absence of jet breakup into droplets.

scholarly journals Liquid jet formation through the interactions of a laser-induced bubble and a gas bubble

AIP Advances ◽  
2017 ◽  
Vol 7 (10) ◽  
pp. 105305 ◽  
Author(s):  
Bing Han ◽  
Liu Liu ◽  
Xiong-Tao Zhao ◽  
Xiao-Wu Ni
Keyword(s):  
Liquid Jet ◽  
Gas Bubble ◽  
Jet Formation

A Numerical Study on Flow Characteristics of 2D Vertical Liquid Jet Striking a Horizontal Surface

2010 ◽  
Author(s):  
M. Kimiaghalam ◽  
M. Passandideh-Fard
Keyword(s):  
Reynolds Number ◽  
Hydraulic Jump ◽  
Numerical Study ◽  
Flow Characteristics ◽  
Newtonian Liquid ◽  
Liquid Jets ◽  
Liquid Jet ◽  
Moderate Reynolds Number ◽  
Different Types ◽  
Newtonian Liquids

We studied numerically impingement of vertical liquid jets of moderate Reynolds number for both Newtonian and non-Newtonian liquids to clarify the structure formation of circular hydraulic jump and the phenomenon of jet buckling. First, we have studied the hydraulic jump characteristics and governing parameters for a laminar water jet. Moreover, different types of hydraulic jump have been investigated by varying the height of a circular wall around the bed in flow downstream. The results show that a circular hydraulic jump has two kinds of steady states which can be reached by changing wall height. Next, we studied the impingement of a non-Newtonian liquid jet on a solid surface. In this case, we observe that instead of having a significant hydraulic jump, jet buckling phenomenon happens. The results were used in order to achieve a better understanding of the jet buckling phenomenon and the conditions in which this phenomenon happens.

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