Phase Distribution Parameter Prediction Using Logistic Model in the Analysis of Two-Phase Flow

2014 ◽  
Author(s):  
Ping Lv ◽  
Han Wang ◽  
Hui Wang
Keyword(s):  
Logistic Model ◽  
Two Phase Flow ◽  
Phase Distribution ◽  
Distribution Parameter ◽  
Phase Flow ◽  
Two Phase ◽  
Parameter Prediction

Phase Distribution Mechanisms in Turbulent Two-Phase Flow in Channels of Arbitrary Cross Section

1981 ◽  
Vol 103 (4) ◽  
pp. 583-589 ◽  
Author(s):  
D. A. Drew ◽  
R. T. Lahey
Keyword(s):  
Cross Sections ◽  
Two Phase Flow ◽  
Phase Distribution ◽  
Bubbly Flow ◽  
Arbitrary Cross Section ◽  
Phase Flow ◽  
Two Phase ◽  
Void Distribution ◽  
Special Case ◽  
Turbulent Two Phase Flow

An analytical model for the phase distribution mechanisms in fully developed turbulent two-phase flow in channels of arbitrary cross sections has been derived. The model has been applied to the special case of cylindrical pipe flow, and compared with existing data. It has been found that, for bubbly flow, it is the distribution of the liquid phase turbulence which determines the void distribution. Furthermore, the void distribution depends on the anisotropic nature of the turbulent two-phase flow.

Phase-distribution mechanisms in turbulent low-quality two-phase flow in a circular pipe

1982 ◽  
Vol 117 ◽  
pp. 91-106 ◽  
Author(s):  
D. A. Drew ◽  
R. T. Lahey
Keyword(s):  
Void Fraction ◽  
Two Phase Flow ◽  
Phase Distribution ◽  
Outer Region ◽  
Continuous Phase ◽  
Circular Pipe ◽  
Phase Flow ◽  
Two Phase ◽  
Centre Line ◽  
Mixing Length Theory

The radial distribution of the volumetric vapour (or void) fraction in steady, fully developed turbulent two-phase flow is described for vertical low-quality bubbly flows in a circular pipe. The analysis is based on the phasic equations of conservation of momentum in the axial and radial directions. Mixing-length theory is used to model the turbulent stresses in the continuous phase. The predicted flow structure shows three distinct regions. The ‘outer’ region, that is, the region away from the wall and the centre-line, has a uniform void distribution. For upflow, a bubble layer is predicted near the wall, while for downflow, vapour coring is predicted, with a peak in void fraction at the centre-line. These predictions are in agreement with observed void profiles.

Two-Phase Flow Distribution in a Compact Heat Exchanger Header

2003 ◽  
Author(s):  
Jong-Soo Kim ◽  
Yong-Bin Im ◽  
Jae-Hong Kim ◽  
Ki-Taek Lee
Keyword(s):  
Heat Exchanger ◽  
Two Phase Flow ◽  
Phase Distribution ◽  
Flow Distribution ◽  
Compact Heat Exchanger ◽  
Phase Flow ◽  
Two Phase ◽  
Insertion Depth ◽  
Different Types ◽  
Uniform Liquid

In this paper an experimental study was investigated for two-phase distribution in compact heat exchanger header. A test section was consisted of the horizontal header (circular tube: φ 5 mm × 80 mm) and 10 upward circular channels (φ 1.5 mm × 850 mm) using acrylic tube. Three different types of tube insertion depth were tested for the mass flux and inlet quality ranges of 50–200 kg/m2s and 0.1–0.3, respectively. Air and water were used as the test fluids. The distribution of vapor and liquid is obtained by measurement of the total mass flow rate and the calculation of the quality. Two-phase flow pattern was observed, and pressure drop of each channel was measured. By adjusting the insertion depth of each channel a uniform liquid flow distribution through the each channel was able to solve the mal-distribution problem.

Impedance-Based Void Fraction Measurement and Flow Regime Identification in Microchannel Flows

2011 ◽  
Author(s):  
Sidharth Paranjape ◽  
Susan N. Ritchey ◽  
Suresh V. Garimella
Keyword(s):  
Flow Regime ◽  
Void Fraction ◽  
High Speed ◽  
Electrical Impedance ◽  
Two Phase Flow ◽  
Phase Distribution ◽  
Electrical Conductance ◽  
Statistical Characteristics ◽  
Phase Flow ◽  
Two Phase

Electrical impedance of a two-phase mixture is a function of void fraction and phase distribution. The difference in the electrical conductance and permittivity of the two phases can be exploited to measure electrical impedance for obtaining void fraction and flow regime characteristics. An electrical impedance meter is constructed for the measurement of void fraction in microchannel two-phase flow. The experiments are conducted in air-water two-phase flow under adiabatic conditions. A transparent acrylic test section of hydraulic diameter 780 micrometer is used in the experimental investigation. The impedance void meter is calibrated against the void fraction measured using analysis of images obtained with a high-speed camera. Based on these measurements, a methodology utilizing the statistical characteristics of the void fraction signals is employed for identification of microchannel flow regimes.

Simulation of Gas-Liquid Two-Phase Flow-Induced Corrosion at Premium Connection in High Productivity Gas Wells Containing CO2

2020 ◽  
Vol 993 ◽  
pp. 1196-1202
Author(s):  
Wen Hong Liu ◽  
Wen Sheng Li ◽  
Nai Xin Lyu ◽  
An Qing Fu ◽  
Qiu Rong Ma
Keyword(s):  
Carbon Dioxide ◽  
Corrosion Rate ◽  
Field Data ◽  
Two Phase Flow ◽  
Phase Distribution ◽  
Phase Flow ◽  
Gas Wells ◽  
Two Phase ◽  
High Productivity ◽  
Flow Induced Corrosion

Numerical simulation was carried out to investigate the gas-liquid two-phase flow-induced corrosion in high productivity gas wells containing carbon dioxide. The Eulerian-Eulerian multiphase model combined with the electrochemical corrosion model was applied to simulate the corrosion rate at the tubing thread connection induced by corrosive medium containing carbon dioxide. The predicted corrosion rate was compared with the field data in the literature. It is shown that the predicted results were conservative when merely considering the phase distribution. Qualitative analysis between the predicted phase distribution, flow characteristics, erosion-corrosion position and the field data was made.

Phase distribution of nitrogen–water two-phase flow in parallel micro channels

2016 ◽  
Vol 53 (4) ◽  
pp. 1175-1182 ◽  
Author(s):  
Mi Zhou ◽  
Shuangfeng Wang ◽  
You Zhou
Keyword(s):  
Two Phase Flow ◽  
Phase Distribution ◽  
Phase Flow ◽  
Two Phase ◽  
Micro Channels

scholarly journals Phase Distribution for Air-water Two-phase Flow in Annuli

1986 ◽  
Vol 29 (255) ◽  
pp. 3007-3014 ◽  
Author(s):  
Tohru FURUKAWA ◽  
Kotohiko SEKOGUCHI
Keyword(s):  
Two Phase Flow ◽  
Phase Distribution ◽  
Phase Flow ◽  
Two Phase
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