Simultaneous void fraction measurement, bubble velocity, and size estimate using a single optical probe in gas–liquid two‐phase flows

1992 ◽  
Vol 63 (11) ◽  
pp. 5442-5453 ◽  
Author(s):  
Alain Cartellier
Keyword(s):  
Void Fraction ◽  
Optical Probe ◽  
Bubble Velocity ◽  
Two Phase Flows ◽  
Two Phase ◽  
Size Estimate ◽  
Fraction Measurement

Investigation of Characteristics of Gas-Liquid Two-Phase Flows in a Rectangular Microchannel With Return Bends

2011 ◽  
Author(s):  
Akimaro Kawahara ◽  
Michio Sadatomi ◽  
Hideki Matsuo ◽  
Satoshi Shimokawa
Keyword(s):  
Void Fraction ◽  
Scaling Law ◽  
Bubble Velocity ◽  
Liquid Slug ◽  
Two Phase Flows ◽  
Two Phase ◽  
Rectangular Microchannel ◽  
Drift Flux Model ◽  
Bubble Length ◽  
Length Data

Gas-liquid two-phase flows in a horizontal rectangular microchannel with return bends have been investigated. The width and the depth of the microchannel are 240 μm and 230 μm, respectively. T-junction type gas-liquid mixer was used to introduce gas and liquid in the channel. In order to know the effects of liquid properties, distilled water, pure ethanol, 49wt% ethanol aqueous solution and HFE7200 were used as the test liquids, while nitrogen gas as the test gas. The flow pattern, the bubble velocity, the bubble length and the liquid slug length were measured, and the void fraction was determined as the ratio of the gas superficial velocity to the bubble velocity. The bubble velocity at a downstream position from the bend is faster than that at an upstream position, and thus the void fraction is smaller at a downstream position. The bubble velocity data were well correlated with the well-known drift flux model with Kawahara et al.’s distribution parameter correlation. The bubble length data at the upstream and the downstream positions are also correlated with the scaling law proposed by Garstecki et al., irrespective of the test liquids. The liquid slug length data are correlated with an exponential function of the void fraction. The ratio of the bubble length to the bubble pitch is also well correlated with a linear function of the homogeneous void fraction.

scholarly journals Precise Void Fraction Measurement in Two-phase Flows Independent of the Flow Regime Using Gamma-ray Attenuation

2016 ◽  
Vol 48 (1) ◽  
pp. 64-71 ◽  
Author(s):  
E. Nazemi ◽  
S.A.H. Feghhi ◽  
G.H. Roshani ◽  
R. Gholipour Peyvandi ◽  
S. Setayeshi
Keyword(s):  
Flow Regime ◽  
Void Fraction ◽  
Gamma Ray ◽  
Two Phase Flows ◽  
Two Phase ◽  
Gamma Ray Attenuation ◽  
Fraction Measurement

Characteristics of Two-Phase Flows in a Rectangular Microchannel With a T-Junction Type Gas-Liquid Mixer

2009 ◽  
Author(s):  
Akimaro Kawahara ◽  
Michio Sadatomi ◽  
Keitaro Nei ◽  
Hideki Matsuo ◽  
Takatoshi Masuda
Keyword(s):  
Pressure Drop ◽  
Void Fraction ◽  
Bubble Velocity ◽  
Velocity Data ◽  
Two Phase Flows ◽  
Two Phase ◽  
Rectangular Microchannel ◽  
Drift Flux Model ◽  
Junction Type ◽  
Bubble Length

In this study, gas-liquid two-phase flows in a horizontal rectangular microchannel have been investigated. The rectangular microchannel has the hydraulic diameter of 0.235 mm, and the width and the depth of 0.24 mm and 0.23 mm, respectively. A T-junction type gas-liquid mixer was used to introduce gas and liquid in the channel. In order to know the effects of liquid properties, distilled water, ethanol and HFE7200 were used as the test liquids, while nitrogen gas as the test gas. The flow pattern, the bubble length, the liquid slug length and the bubble velocity in two-phase flow were measured with a high speed video camera, and the void fraction was determined from the bubble velocity data and the superficial gas velocity data. In addition, the pressure drop was also measured with a calibrated differential pressure transducer. The bubble length data were compared with the calculation by the scaling law proposed by Garstecki et al (2006). The bubble velocity data and/or the void fraction data were well correlated with the well-known drift flux model (Zuber and Findlay, 1965) with a new distribution parameter correlation developed in this study. The frictional pressure drop data were also well correlated with Lockhart-Martinelli method with a correlation of two-phase friction multiplier.

Measurement of a Void Fraction in Bubbly Gas-Water Two Phase Flows Using Differential Pressure Technique

2012 ◽  
Vol 152-154 ◽  
pp. 1221-1226
Author(s):  
H.A.M. Hasan Abbas
Keyword(s):  
Experimental Study ◽  
Void Fraction ◽  
Volume Fraction ◽  
Differential Pressure ◽  
Flow Density ◽  
Two Phase Flows ◽  
Two Phase ◽  
Gas Volume Fraction ◽  
Fraction Measurement ◽  
Gas Volume

Multiphase flows, where two or even three fluids flow simultaneously in a pipe are becoming increasingly important in industry. In order to measure the flow rate of gas-water two phase flows accurately, the void fraction (gas volume fraction) in two phase flows must be precisely measured. The differential pressure technique has proven attractive in the measurement of volume fraction. This paper presents the theoretical and experimental study of the void fraction measurement in bubbly gas water two phase flows using differential pressure technique (the flow density meter).

Gas Void Fraction Prediction for Air-Water and Air-Oil Two-Phase Flows via Artificial Neural Network

2019 ◽  
Author(s):  
Tiago Ferreira Souza ◽  
Caio Araujo ◽  
Maurício Figueiredo ◽  
FLAVIO SILVA ◽  
Ana Maria Frattini Fileti
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Void Fraction ◽  
Two Phase Flows ◽  
Two Phase ◽  
Artificial Neural ◽  
Gas Void Fraction

Void fraction measurement of the air-water two-phase flow in the sub-channel of a rod bundle geometry based on an impedance meter

2018 ◽  
Vol 115 ◽  
pp. 480-486 ◽  
Author(s):  
Bin Yu ◽  
Wenxiong Zhou ◽  
Liangming Pan ◽  
Hang Liu ◽  
Quanyao Ren ◽  
...  
Keyword(s):  
Void Fraction ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Rod Bundle ◽  
Fraction Measurement ◽  
Impedance Meter

An optical probe for liquid–liquid two-phase flows

2007 ◽  
Vol 18 (5) ◽  
pp. 1563-1575 ◽  
Author(s):  
A K Jana ◽  
T K Mandal ◽  
D P Chakrabarti ◽  
G Das ◽  
P K Das
Keyword(s):  
Optical Probe ◽  
Two Phase Flows ◽  
Two Phase
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