The motion of Taylor bubbles in vertical tubes. I. A numerical simulation for the shape and rise velocity of Taylor bubbles in stagnant and flowing liquid

1990 ◽  
Vol 91 (1) ◽  
pp. 132-160 ◽  
Author(s):  
Zai-Sha Mao ◽  
A.E Dukler
Keyword(s):  
Numerical Simulation ◽  
Rise Velocity ◽  
Flowing Liquid ◽  
Vertical Tubes ◽  
Taylor Bubbles

scholarly journals DEVELOPED LIQUID FILMS FALLING AROUND TAYLOR BUBBLES INSIDE VERTICAL STAGNANT COLUMNS

2021 ◽  
Vol 9 (2B) ◽  
Author(s):  
Marcos Bertrand De Azevedo
Keyword(s):  
Liquid Films ◽  
Liquid Interfaces ◽  
Rise Velocity ◽  
Turbulent Transition ◽  
Vertical Tubes ◽  
Free Falling ◽  
Pulse Echo ◽  
Equilibrium Thickness ◽  
Laminar Turbulent Transition ◽  
Taylor Bubbles

The present work reports an experimental study of developed liquid films falling around single Taylor bubbles inside vertical tubes containing stagnant liquids. Experiments were carried out in acrylic tubes with 2.0 m length and inner diameters of 0.019, 0.024 and 0.034 m. Five water-glycerin mixtures were used, corresponding to film Reynolds number（Ref）ranging from 2 to 7650. A pulse-echo ultrasonic technique was applied to measure the rise velocity of the bubble and the equilibrium thickness of the liquid film. These parameters together with the calculated standard deviation of the equilibrium film thickness provided information about the development of waves on the gas-liquid interfaces, which could be related with the laminar-turbulent transition of liquid films falling around Taylor bubbles. The results indicated that the wave amplitudes increased sharply for Ref> 1000. This value of Ref is in agreement with literature concerning the laminar-turbulent transition for free falling films on vertical surfaces.

Liquid Taylor Bubbles Rising in a Vertical Column of a Heavier Liquid: An Approximate Analysis

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
T. K. Mandal ◽  
G. Das ◽  
P. K. Das
Keyword(s):  
Empirical Equation ◽  
Flow Analysis ◽  
Rise Velocity ◽  
Vertical Column ◽  
Taylor Bubble ◽  
Two Fluids ◽  
Viscosity Effects ◽  
Semi Empirical ◽  
Theoretical Analyses ◽  
Taylor Bubbles

It has been noted that a volume of lighter liquid when injected into a stationary column of a heavier liquid, it rises up as a simple elongated Taylor bubble. In the present study, experimental and theoretical analyses have been performed to understand the rise of liquid Taylor bubbles. The experiments have been performed with different liquid pairs with their viscosities ranging from 0.71mPas to 1.75mPas and conduit sizes ranging from 0.012 m to 0.0461 m. The bubble shape has been predicted using a potential flow analysis and validated from photographic measurements. This analysis has been further modified to predict the rise velocity. The modified analysis accounts for the density difference between the two liquids, viscosity effects of the primary liquid, and interfacial tension of two fluids. A semi-empirical equation has been developed, which gives satisfactory results for most of the cases.

scholarly journals Numerical Simulation of Particle Behavior in Fluidized Bed Equipped with Immersed Vertical Tubes.

1999 ◽  
Vol 25 (5) ◽  
pp. 815-819
Author(s):  
NOBUSUKE KOBAYASHI ◽  
RYOHEI YAMAZAKI ◽  
SHIGEKATSU MORI
Keyword(s):  
Numerical Simulation ◽  
Fluidized Bed ◽  
Particle Behavior ◽  
Vertical Tubes

scholarly journals Turbulence modulation in buoyancy-driven bubbly flows

2021 ◽  
Vol 932 ◽  
Author(s):  
Vikash Pandey ◽  
Dhrubaditya Mitra ◽  
Prasad Perlekar
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Bubble Diameter ◽  
Bubbly Flows ◽  
Air Bubbles ◽  
Rise Velocity ◽  
Turbulence Modulation ◽  
Budget Analysis ◽  
Average Rise ◽  
Turbulence Scaling

We present a direct numerical simulation (DNS) study of buoyancy-driven bubbly flows in the presence of large-scale driving that generates turbulence. On increasing the turbulence intensity: (a) the bubble trajectories become more curved and (b) the average rise velocity of the bubbles decreases. We find that the energy spectrum of the flow shows a pseudo-turbulence scaling for length scales smaller than the bubble diameter and a Kolmogorov scaling for scales larger than the bubble diameter. We conduct a scale-by-scale energy budget analysis to understand the scaling behaviour observed in the spectrum. Although our bubbles are weakly buoyant, the statistical properties of our DNS are consistent with the experiments that investigate turbulence modulation by air bubbles in water.

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