Diffraction-shadow technique of single bubble size and velocity measurements

2006 ◽  
Author(s):  
B. S. Rinkevichyus ◽  
I. L. Raskovskaya ◽  
A. V. Tolkachev
Keyword(s):  
Bubble Size ◽  
Single Bubble ◽  
Velocity Measurements

scholarly journals Experimental study of air-water two-phase jet: bubble size distribution and velocity measurements

2018 ◽  
Vol 1110 ◽  
pp. 012011 ◽  
Author(s):  
Di Nunno Fabio ◽  
Alves Pereira Francisco ◽  
de Marinis Giovanni ◽  
Di Felice Fabio ◽  
Gargano Rudy ◽  
...  
Keyword(s):  
Experimental Study ◽  
Size Distribution ◽  
Bubble Size ◽  
Bubble Size Distribution ◽  
Velocity Measurements ◽  
Two Phase

Numerical study of single bubble rising dynamics using the phase field lattice Boltzmann method

2018 ◽  
Vol 29 (11) ◽  
pp. 1850111 ◽  
Author(s):  
Ting Su ◽  
Yang Li ◽  
Hong Liang ◽  
Jiangrong Xu
Keyword(s):  
Reynolds Number ◽  
Bubble Size ◽  
Lattice Boltzmann ◽  
Viscosity Ratio ◽  
Density Ratio ◽  
Terminal Velocity ◽  
Single Bubble ◽  
Bubble Shape ◽  
Bubble Rising ◽  
Eotvos Number

In this paper, the rising dynamics of a two-dimensional single bubble in the duct is systematically studied by using an improved phase field lattice Boltzmann (LB) multiphase model. This model enables to handle multiphase flows with mass conservation and high density ratio, up to the order of [Formula: see text], which are unavailable in the LB community. The model is first validated by simulating bubble rising problem with the density ratio of 1000 and numerical solutions for bubble shape and position agree well with the previous literature data. Then, it is used to study single bubble rising through a quiescent liquid. The dynamic behavior of the bubble and rising velocity are shown, and the influences of several important physical quantities, including the Eotvos number, Reynolds number, density ratio, viscosity ratio, bubble size and initial bubble shape, are investigated in detail. The numerical results show that the bubble undergoes a great deformation with the increase of the Eotvos number or Reynolds number, and even could break up into multiple satellite bubbles at a sufficiently large value of Eotvos number or Reynolds number. Several classic terminal bubble shapes are also successfully produced in the system. The terminal rising velocity of bubble at equilibrium shows to present an initial increase with the Eotvos number and finally decreases with it, while increasing the Reynolds number could enhance the bubble rising velocity. Both the density ratio and viscosity ratio have less influence on the terminal shape of the bubble, while a greater influence on the rising velocity is reported for the density ratio smaller than 20 and it seems to be independent of the viscosity ratio. At last, we discuss the effects of the bubble size and initial bubble shape. It is found that bubble size has little influence on terminal bubble shape, but decreasing the bubble size can improve the bubble terminal velocity. On the other hand, both the deformation and terminal velocity of the bubble are found to no longer change much with its initial shape.

scholarly journals Experimental study on breakup of a single bubble in a stirred tank: Effect of gas density and liquid properties

2021 ◽  
Author(s):  
Huahai Zhang ◽  
Yuelin Wang ◽  
Ali Sayyar ◽  
Tiefeng Wang
Keyword(s):  
Size Distribution ◽  
Bubble Size ◽  
High Speed ◽  
Agitation Speed ◽  
Bubble Size Distribution ◽  
Stirred Tank ◽  
Single Bubble ◽  
Operating Pressure ◽  
Gas Density ◽  
Bubble Breakup

Bubble breakup plays an important role in gas-liquid flows, but detailed studies are still scarce. In this work, the breakup behavior of a single bubble in a stirred tank was experimentally studied with a high-speed camera, focusing on the effect of gas density, liquid properties, agitation speed and mother bubble size. The bubble breakup time, breakup probability, breakup rate and daughter bubble size distribution were determined. The internal flow phenomenon inside a deformed bubble was studied in detail, which accounted for the effect of gas density or operating pressure. The results showed that with increasing gas density, agitation speed, mother bubble size and decreasing surface tension, the bubble breakup rate and probability of equal-size distribution significantly increased. With increasing liquid viscosity, the bubble breakup rate decreased especially in the high viscosity range. An M-shaped daughter bubble size distribution was observed, which was consistent with our previous bubble breakup model.

Numerical Simulations for Hydrodynamics of Air-Water External Loop Airlift Reactor Flows With Bubble Break-Up and Coalescence Effects

2013 ◽  
Vol 135 (8) ◽  
Author(s):  
Deify Law ◽  
Francine Battaglia
Keyword(s):  
Bubble Size ◽  
Bubble Column ◽  
National Laboratory ◽  
Airlift Reactor ◽  
Single Bubble ◽  
Bubble Column Reactor ◽  
Dimensional System ◽  
Ensemble Averaging ◽  
External Loop ◽  
Bubble Breakup

The external loop airlift reactor (ELALR) is a modified bubble column reactor that is composed of two vertical columns interconnected with two horizontal tubes and is often preferred over traditional bubble column reactors because it can operate over a wider range of conditions. In the present work, the gas-liquid flow dynamics in an ELALR were simulated using an Eulerian–Eulerian ensemble-averaging method with bubble breakup and coalescence effects in a three-dimensional system. The population balance models (PBM) of Luo and Svendsen (1996, “Theoretical Model for Drop and Bubble Breakup in Turbulent Dispersions,” AIChE J., 42, pp. 1225–1233) and Prince and Blanch (1990, “Bubble Coalescence and Breakup in Air-Sparged Bubble Columns,” AIChE J., 36, pp. 1485–1499) were used to simulate the bubble breakup and coalescence effects, respectively. The bubble breakup and coalescence closure models were implemented into CFDLib, a multiphase flow source code developed by Los Alamos National Laboratory, and validated with experiments. The computational fluid dynamics (CFD) simulations were then compared to experimental measurements from a 10.2 cm diameter ELALR for superficial gas velocities ranging from 1 to 20 cm/s. From this work, the 3D PBM simulations of an external loop airlift reactor were generally comparable with the 3D single bubble size simulations. However, the 3D PBM simulations have closer agreement with experimental findings than the single bubble size simulations especially regarding the length of gas bubbles in the downcomer.

Radio‐frequency probe for bubble size and velocity measurements

1979 ◽  
Vol 50 (10) ◽  
pp. 1260-1263 ◽  
Author(s):  
N. Abuaf ◽  
T. P. Feierabend ◽  
G. A. Zimmer ◽  
O. C. Jones
Keyword(s):  
Radio Frequency ◽  
Bubble Size ◽  
Velocity Measurements
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