scholarly journals Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

2017 ◽  
Vol 164 (13) ◽  
pp. E448-E459 ◽  
Author(s):  
Amir Taqieddin ◽  
Roya Nazari ◽  
Ljiljana Rajic ◽  
Akram Alshawabkeh
Keyword(s):  
Gas Bubbles ◽  
Two Phase ◽  
Electrochemical Systems

From disturbance to measurement: Application of Coriolis meter for two-phase flow with gas bubbles

2021 ◽  
Vol 79 ◽  
pp. 101892
Author(s):  
Hao Zhu ◽  
Alfred Rieder ◽  
Wolfgang Drahm ◽  
Yaoying Lin ◽  
Andreas Guettler ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Gas Bubbles ◽  
Phase Flow ◽  
Two Phase

scholarly journals Two-phase flow equations for a dilute dispersion of gas bubbles in liquid

1984 ◽  
Vol 148 ◽  
pp. 301-318 ◽  
Author(s):  
A. Biesheuvel ◽  
L. Van Wijngaarden
Keyword(s):  
Acoustic Waves ◽  
Equations Of Motion ◽  
Gas Bubbles ◽  
Local Stress ◽  
Mass Conservation ◽  
Ensemble Averaging ◽  
Two Phase ◽  
Average Force ◽  
Gas Concentration ◽  
Flow Equations

Equations of motion correct to the first order of the gas concentration by volume are derived for a dispersion of gas bubbles in liquid through systematic averaging of the equations on the microlevel. First, by ensemble averaging, an expression for the average stress tensor is obtained, which is non-isotropic although the local stress tensors in the constituent phases are isotropic (viscosity is neglected). Next, by applying the same technique, the momentum-flux tensor of the entire mixture is obtained. An equation expressing the fact that the average force on a massless bubble is zero leads to a third relation. Complemented with mass-conservation equations for liquid and gas, these equations appear to constitute a completely hyperbolic system, unlike the systems with complex characteristics found previously. The characteristic speeds are calculated and shown to be related to the propagation speeds of acoustic waves and concentration waves.

Surface Tension Effects on Liquid Flow in Small Plastic Tubes When Gas Bubbles are Present

2005 ◽  
Vol 219 (8) ◽  
pp. 853-857 ◽  
Author(s):  
M. R. Myers ◽  
H. M. Cave ◽  
S. P. Krumdieck
Keyword(s):  
Surface Tension ◽  
High Pressure ◽  
Pressure Drop ◽  
Liquid Flow ◽  
Slug Flow ◽  
Small Diameter ◽  
Gas Bubbles ◽  
Flow Regimes ◽  
Liquid Slug ◽  
Two Phase

Two-phase intermittent gas and liquid slug flow in small diameter glass and plastic tubes was studied. Two distinct flow regimes and the transition phenomena were identified. A modified Hagen-Poiseuille relation was derived to describe the extremely high pressure drop due to the surface tension effects of pinned slug flow.

scholarly journals Induced by acoustic fieldsprocesses of structure formation in high-molecular media

2021 ◽  
Vol 9 (2) ◽  
pp. 128-143
Keyword(s):  
Structure Formation ◽  
Gas Bubbles ◽  
Well Logging ◽  
Acoustic Fields ◽  
Two Phase ◽  
Oil Saturation ◽  
Vibra Tions ◽  
Oil Processing ◽  
Dispersed Medium

The paper considers the mechanisms of destruction and synthesis of macromolecules, which can be stimulated by external acoustic fields in a two-phase, oil dispersed medium containing a large number of gas bubbles. It is assumed that the dynamics of these bub-bles depends on changes in the geometry of the flow and the excitation of sound vibra-tions in the flow. Particular attention is paid to the process of changing the density of a liquid due to the effect of an internal airlift in a liquid dispersed medium. Mechanically induced kinetic changes in macromolecules (destruction and synthesis of colloidal chains) can occur when bubbles collapse. These features can be used in oil processing and well logging to assess oil saturation of reservoirs.

Experimental and Theoretical Study on Mixing Performance in Gas-Stirred Ladles With Throughflow Having Tap-Stream Addition of Particulates

2010 ◽  
Author(s):  
Wen-Jei Yang ◽  
Shuichi Torii
Keyword(s):  
Line Profile ◽  
Theoretical Study ◽  
Gas Bubbles ◽  
Light Sheet ◽  
Injection Rate ◽  
Air Injection ◽  
Two Phase ◽  
Mixing Performance ◽  
Bubble Detachment ◽  
History Of

An experimental study is performed to determine mixing performance in gas-ladles with throughflow having tap-addition of particles. Behavior of ascending gas bubbles in the plume and recirculating liquid-particle two-phase flow is visualized by means of direct photography aided by white light-sheet illumination. The path line profile and the history of ascending velocity of gas bubbles from the gas-injection nozzle installed at the ladle bottom are measured with the aid of the image processing method. It is disclosed that a rhythm is discovered in bubble detachment from the nozzle tip. This rhythm repeats by cycle and is characterized by two distinct patterns, forming the discrete bubbles regime and continuous jet regime for lower and higher air injection rates, respectively. Inspective of air injection rate, the growth of each bubble can be divided into the initial, intermediate, and final stages. Each stage has its own distinct bubble growth velocity, path line profile, and ascending velocity. The theoretical equation is derived to correlate experimental data on bubble path line.

Estimation of Interfacial Area Concentration for Two-Phase Slug Flow From Dual-Probe Hot-Film Measurements

2003 ◽  
Author(s):  
G. Wang ◽  
C. Y. Ching
Keyword(s):  
Surface Area ◽  
Slug Flow ◽  
Synthesis Method ◽  
Gas Bubbles ◽  
Interfacial Area ◽  
Two Phase ◽  
Interfacial Area Concentration ◽  
Hot Film ◽  
Dual Probe ◽  
Taylor Bubbles

A relatively simple technique has been developed to estimate the interfacial area concentration (ai) of vertically upward gas-liquid slug flow from dual-probe hot-film anemometry measurements. The slug flow is modeled as a series of Taylor bubbles having a regular bullet-like shape separated by liquid slugs containing small spherical gas bubbles. The total interfacial area is the sum of the Taylor bubble surface area and the surface area of the bubbles in the liquid slugs. The ai is estimated from the mean diameter and local void fraction of the bubbles in the liquid slugs, and the length of the Taylor bubbles. These parameters are obtained through selective discrimination of the hot-film signals to separate the Taylor bubbles from the smaller gas bubbles in the liquid slugs. The important non-dimensional parameters that influence the interfacial area concentration are obtained using the synthesis method. A new correlation for ai for vertically-upward slug flow is developed based on the present measurements.

Application of Optical Tomography for Monitoring Gas Bubbles Flow Based on Independent Component Analysis Algorithm

2015 ◽  
Vol 73 (3) ◽  
Author(s):  
Mohd Taufiq Mohd Khairi ◽  
Sallehuddin Ibrahim ◽  
Mohd Amri Md Yunus ◽  
Mahdi Faramarzia ◽  
Nor Muzakkir Nor Ayub
Keyword(s):  
Independent Component Analysis ◽  
Phase Distribution ◽  
Pure Water ◽  
Optical Tomography ◽  
Gas Bubbles ◽  
Component Analysis ◽  
Independent Component ◽  
Bubble Flow ◽  
Two Phase ◽  
Ica Algorithm

This paper presents the monitoring process of gas bubbles flow in water using an optical tomography system. The system is aided by an Independent Component Analysis (ICA) algorithm for distinguishing the gas bubbles in pure water. The optical attenuation model is implemented for studying the light transmissions to different media which is water and air. Several quantities of air are inserted using an air pump which is installed at the bottom of a flow pipe in order to produce the gas bubbles flow upwards. The quantity of air is controlled by using a valve and five types of bubble flow are investigated; a single bubble flow, double bubble’s flow, 25% of air opening, 50% of air opening and 100% of air opening. The concentration profiles of the gas bubble flow are constructed. The concentration profile obtained from the experiments shows that the ICA algorithm can be used as a tool for imaging the two-phase flow phase distribution.     

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