scholarly journals Design of a Real-time Bubble Shape Detector for Gas-liquid Two-phase Flow in Coalbed Methane Development Wells Based on Optical Sensors

2019 ◽  
Vol 37 (2) ◽  
pp. 659-664
Author(s):  
Hongliang Liu
Keyword(s):  
Real Time ◽  
Optical Sensors ◽  
Coalbed Methane ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Bubble Shape ◽  
Two Phase

Massive fines detachment induced by moving gas-water interfaces during early stage two-phase flow in coalbed methane reservoirs

Fuel ◽  
2018 ◽  
Vol 222 ◽  
pp. 193-206 ◽  
Author(s):  
Fansheng Huang ◽  
Yili Kang ◽  
Lijun You ◽  
Xiangchen Li ◽  
Zhenjiang You
Keyword(s):  
Coalbed Methane ◽  
Two Phase Flow ◽  
Early Stage ◽  
Phase Flow ◽  
Two Phase

scholarly journals A fully coupled thermal-hydraulic-mechanical model with two-phase flow for coalbed methane extraction

2016 ◽  
Vol 33 ◽  
pp. 324-336 ◽  
Author(s):  
Sheng Li ◽  
Chaojun Fan ◽  
Jun Han ◽  
Mingkun Luo ◽  
Zhenhua Yang ◽  
...  
Keyword(s):  
Mechanical Model ◽  
Coalbed Methane ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Methane Extraction ◽  
Fully Coupled

Two Phase Gas-Liquid Bubbly Flow Modeling in Vertical Mini Pipe

2010 ◽  
Author(s):  
M. H. Kebriaee ◽  
H. Karabi ◽  
S. Khorsandi ◽  
M. H. Saidi
Keyword(s):  
Void Fraction ◽  
Two Phase Flow ◽  
Bubbly Flow ◽  
Superficial Velocity ◽  
Small Scale ◽  
High Heat Flux ◽  
Phase Flow ◽  
Bubble Shape ◽  
Pipe Axis ◽  
Two Phase

Studies on two-phase flow in small scale pipes have become more important, because of the application of mini-scale devices in several engineering fields including, high heat-flux compact heat exchangers, and cooling systems of various types of equipment. In a mini pipe the behavior of two phase flow is not the same as flow in conventional pipes. The difference is caused by different effective forces; for e. g. inside a mini pipe capillary forces are more important in comparison with gravitational forces. This paper is devoted to numerical simulation of gas-liquid two phase flow in a vertical mini pipe. Prediction of bubble shape and the effects of gas and liquid velocities on flow characteristics are considered. Also simulation involves prediction of changes in average void fraction along pipe axis. Numerical simulations in this paper are performed by a designed and developed CFD package which is based on Eulerian-Eulerian approach. The governing equations which are solved in the CFD package are momentum, continuity and Fractional Volume of Fluid (VOF) function equations. The fluid is assumed to be viscous and incompressible. The pressure-velocity coupling is obtained using the SIMPLEC algorithm. The geometry, which have been studied in this paper, is a D = 1.02 mm pipe, with 500 mm height. Bubble shape and the distribution of void fraction in a mini pipe are related to many parameters such as: gas and liquid velocities, pressure losses and etc. Since these mechanisms vary over time, time-average value of void fraction is used. Comparisons between Numerical results and experimental work which performed by hibiki et al. [1] indicated good agreement. Also results have shown that the present model is capable to simulate the behavior of nitrogen-water two phase flow in a mini pipe with acceptable accuracy. Furthermore, the results indicates that average void fraction along the pipe axis is related to the height and nitrogen superficial velocity. Also it is observed that at constant nitrogen superficial velocities, average void fraction decreases with water superficial velocity increments.

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