Prediction of pressure drop and void-fraction in annular two-phase flows

1985 ◽  
Vol 63 (5) ◽  
pp. 728-734 ◽  
Author(s):  
V. Kadambi
Keyword(s):  
Pressure Drop ◽  
Void Fraction ◽  
Two Phase Flows ◽  
Two Phase

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.

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

scholarly journals Pressure drop and average void fraction measurements for two-phase flow through highly permeable porous media

2016 ◽  
Vol 94 ◽  
pp. 422-432 ◽  
Author(s):  
N. Chikhi ◽  
R. Clavier ◽  
J.-P. Laurent ◽  
F. Fichot ◽  
M. Quintard
Keyword(s):  
Porous Media ◽  
Pressure Drop ◽  
Void Fraction ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Through

Frictional pressure drop analysis for horizontal and vertical air-water two-phase flows in different pipe sizes

2018 ◽  
Vol 332 ◽  
pp. 147-161 ◽  
Author(s):  
Cihang Lu ◽  
Ran Kong ◽  
Shouxu Qiao ◽  
Joshua Larimer ◽  
Seungjin Kim ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Two Phase Flows ◽  
Two Phase ◽  
Frictional Pressure Drop

Two-Phase Flow Through Square and Circular Microchannels—Effects of Channel Geometry

2004 ◽  
Vol 126 (4) ◽  
pp. 546-552 ◽  
Author(s):  
Peter M.-Y. Chung ◽  
Masahiro Kawaji ◽  
Akimaro Kawahara ◽  
Yuichi Shibata
Keyword(s):  
Pressure Drop ◽  
Void Fraction ◽  
Two Phase Flow ◽  
Flow Characteristics ◽  
Separated Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Channel Geometry ◽  
Frictional Pressure Drop ◽  
Channel Shape

An adiabatic experiment was conducted to investigate the effect of channel geometry on gas-liquid two-phase flow characteristics in horizontal microchannels. A water-nitrogen gas mixture was pumped through a 96 μm square microchannel and the resulting flow pattern, void fraction and frictional pressure drop data were compared with those previously reported by the authors for a 100 μm circular microchannel. The pressure drop data were best estimated using a separated-flow model and the void fraction increased non-linearly with volumetric quality, regardless of the channel shape. However, the flow maps exhibited transition boundaries that were shifted depending on the channel shape.

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