scholarly journals Review of Factors Affecting the Phase-Redistribution in the Branching T-Junction

2021 ◽  
Vol 84 (1) ◽  
pp. 60-77
Author(s):  
Faheem Ejaz ◽  
William Pao ◽  
Mohammad Shakir Nasif
Keyword(s):  
Phase Separation ◽  
Flow Regimes ◽  
Chemical Processes ◽  
Separation Process ◽  
Superficial Velocity ◽  
Geometrical Parameters ◽  
Two Phase ◽  
Factors Affecting ◽  
Velocity Flow

Whenever T-junctions are used in chemical processes and petroleum industries for two-phase separation, a maldistribution of phases is observed between outlets of the junction. Currently, the regular T-junctions are utilized in the industry due to which equipment downstream faces high liquid carryovers. Unfortunately, downstream equipment is not capable of handling high liquid carryovers and they trip frequently, consequently. This review manuscript summarizes the effect of different factors that influence phase separation in the T-junction. This article refers to the geometrical parameters, phase superficial velocity flow regimes encounter during the separation process, and different side arm modifications. This article is a contribution to this field as it summarizes and concludes all these factors comprehensively, to give a verdict on ways to improve phase separation. It is also recommended that the effect of side arm modifications or combinations must be explored for further understanding.

Changes of Two Phase Composition in Phase Separation Process of Na2O-CaO-Al2O3-B2O3-SiO2-TiO2 System

2010 ◽  
Vol 105-106 ◽  
pp. 739-742
Author(s):  
Wen Li Zhang ◽  
Shui Jing Gao ◽  
Jing Fu Wang ◽  
Jian Guo Jin
Keyword(s):  
Phase Composition ◽  
Phase Separation ◽  
Separation Process ◽  
Raw Material ◽  
Network Adjustment ◽  
Two Phase ◽  
Rich Phase ◽  
Phase Separation Temperature ◽  
Phase Separation Process ◽  
Separation Temperature

The titaniferous blast furnace slag was selected as a kind of main raw material in the glass preparation. The glass system was separated phase into boron-rich phase and silicon-rich phase in Na2O-CaO-Al2O3-B2O3-SiO2-TiO2 system, and the changes of the two-phase composition after heat treated at different temperatures were studied. Results indicated that the network adjustment oxide existing in boron-rich phase was only CaO when phase separation temperature was below 750°C, and Na2O concentrated in silicon-rich phase. With the phase separation temperature rising, the distribution of Al2O3 and CaO was almost unchanged, whereas Na2O transferred from the silicon-rich phase to boron-rich phase gradually. In the phase separation process, TiO2 concentrated and crystallized on the phase separation interface.

scholarly journals Experimental investigation of multiphase separation in different flow regimes through T-junction with an expander section

2019 ◽  
Vol 13 (2) ◽  
pp. 5163-5181
Author(s):  
Z. Q. Memon ◽  
W. Pao ◽  
F. Hashim ◽  
S. Ahmed
Keyword(s):  
Experimental Data ◽  
Phase Separation ◽  
Slug Flow ◽  
Vertical Plane ◽  
Flow Regimes ◽  
Diameter Ratio ◽  
Superficial Velocity ◽  
Inlet Section ◽  
Water Mixture ◽  
Gas Velocity

The experimental data for phase separation of the air-water mixture in a T-Junction with the expander section after the branch arm is presented in this work. The main and run arms of the T-junction are directed along the horizontal plane with the branch arm positioned in the vertical plane. The diameter of the main arm is 74 mm, with diameter ratio(s) of, 0.67, and 0.33 in relation to branch arm. At the inlet section of the T-junction, the flow regimes generated were stratified, stratified wavy and slug flow. At the inlet, the air and water superficial velocities are in the range of 0.25 - 0.140 m/s and 0.14-0.78 m/s respectively. The effect of the expander section after the branch arm, the air superficial velocity USA and water superficial velocity USw on liquid carryover (WL3/WL1)max in branch arm have been studied. Based on the experimental data obtained for T-junction with expander section, complete phase separation of air and water was observed in stratified and stratified wavy flow for all superficial velocities and improved phase separation for slug flow. In slug flow, increasing the liquid superficial velocity improves the phase separation but increasing the gas velocity decreases the phase separation. Finally, the volume weighted phase in this new T-junction design is compared with the phase separation data of a simple T-junction.

Pressure Drop Fluctuation and Flow Regime Identification for Air-Water Two-Phase Flow

2000 ◽  
Author(s):  
Bofeng Bai ◽  
Tiejun Wu ◽  
Liejin Guo ◽  
Xuejun Chen
Keyword(s):  
Fractal Dimension ◽  
Pressure Drop ◽  
Two Phase Flow ◽  
Pressure Fluctuations ◽  
Flow Regimes ◽  
Superficial Velocity ◽  
Phase Flow ◽  
Two Phase ◽  
Propagation Network ◽  
First Time

Abstract The fluctuating pressure drop for air-water two-phase flow was measured in the vertical upward section of U-type tube with 0.05m I.D. The feature of the fluctuations was extracted by means of statistical and chaotic theories. The influence of liquid superficial velocity on the features was also investigated. The results showed that the mean, root mean square, fractal dimension of pressure drop fluctuations is function of flow regimes. The fractal dimension can be larger than 1.5 in annular flow with great liquid superficial velocity which is reported for the first time. Furthermore, the present paper provided a feasible solution, which the gas-liquid two-phase flow regimes can be recognized automatically and objectively on basis of the combination of the Counter Propagation Network (CPN) and the FFT coefficients of the differential pressure fluctuations. The recognition possibility is determined by the clustering results of the Kohonen layer in the CPN. With the presented test cases, the possibility can be greater than 90 percent for different liquid phase velocity.

scholarly journals Numerical simulation of two-phase separation in T-junction with experimental validation

2018 ◽  
Vol 12 (4) ◽  
pp. 4216-4230
Author(s):  
Minh Tran ◽  
Zeeshan Memon ◽  
Ahmed Saieed ◽  
William Pao ◽  
Fakhruldin Hashim
Keyword(s):  
Phase Separation ◽  
Slug Flow ◽  
Dimensionless Parameter ◽  
Separation Efficiency ◽  
Area Under The Curve ◽  
Superficial Velocity ◽  
Separation Performance ◽  
Air Velocity ◽  
Two Phase ◽  
Average Deviation

Liquid carryover in T-junction due to splitting nature of two-phase flow causes serious issues for downstream equipment which is not designed to handle excessive liquid. In this paper, the phenomena of liquid carryover in T-junctions were analyzed using the Volume of Fraction (VOF) together with the k-ε turbulence model. T-junction separation efficiency was measured through mass flow rate fraction of air and water between the branch and main arm over a range of diameter ratios 0.6 to 1.0, water superficial velocity 0.186 to 0.558 m/s and air superficial velocity 4 to 8 m/s. The results showed simulation model was successfully validated with average deviation of less than 5% and can be used to predict phase split of slug flow in T-junction. The numerical model confirmed the significant influence of diameter ratio and superficial velocities of air and water on phase split. Reduced T-junction delivers better separation performance compared to regular T-junction. In slug flow regime, T-junction’s performance can be improved by either decreasing air velocity or increasing water velocity. A new dimensionless parameter, namely the area under the curve of separation efficiency (S), was proposed and proved as a qualified judging criteria for evaluating phase separation efficiency of T-junctions.

scholarly journals THE DIAGNOSTIC OF TWO-PHASE SEPARATION PROCESS USING DIGITAL IMAGE SEGMENTATION ALGORITHMS

2020 ◽  
Vol 10 (3) ◽  
pp. 5-8
Author(s):  
Michał Łukiański ◽  
Radoslaw Wajman
Keyword(s):  
Phase Separation ◽  
Digital Images ◽  
Control Unit ◽  
Video Stream ◽  
Poor Quality ◽  
Separation Process ◽  
Two Phase ◽  
Phase Separation Process ◽  
Complete Procedure ◽  
On Line

The project aimed to develop and implement algorithms to diagnose the phase separation process based on digital images. The image processing techniques and various numerical methods for interpolation and integration were used to identify the process state. The swirl’s volume and diameters at its three different levels can be determined on-line. A consistent diagnostic signal is produced and can be used by the control unit. The program was written in Python using the OpenCV library that allows the analysis of digital images. The article presents the developed procedure that provides reliable results despite the poor quality of the input source video stream. The complete procedure was described with the results’ presentation and discussion at each step.

Numerical Study of Oil-Water Two Phase Separation in Hydrocyclone

2011 ◽  
Vol 339 ◽  
pp. 543-546 ◽  
Author(s):  
Fu Lun Zhang ◽  
Song Sheng Deng ◽  
Pan Feng Zhang
Keyword(s):  
Phase Separation ◽  
Volume Fraction ◽  
Numerical Study ◽  
Reynolds Stress Model ◽  
Separation Process ◽  
Two Phase ◽  
Water Separation ◽  
Phase Volume Fraction ◽  
Oil Water ◽  
Two Phases

This paper presents a numerical study of the oil-water two phase flow in hydrocyclone. Oil-water two phase separation was simulated by using Reynolds Stress Model and Mixer model of multi-phase models. The oil-water separation process, oil-phase volume fraction distribution, and trajectory about the water-oil two phase liquid flowing within hydrocyclone were obtained. The study show that the separation of water-oil two phases is mainly in the swirl-chamber and cone section in hydrocyclone, however, the cylindrical section plays an inessential role in stabilizing the flow field during separation process.

Characterization of flow regimes in two phase flow using wavelet analysis

2018 ◽  
Author(s):  
Munzarin Morshed ◽  
Syed Imtiaz ◽  
Mohammad Aziz Rahman
Keyword(s):  
Wavelet Analysis ◽  
Two Phase Flow ◽  
Flow Regimes ◽  
Phase Flow ◽  
Two Phase

Axial dispersion in the liquid phase in a horizontal two-phase tube reactor

1991 ◽  
Vol 56 (6) ◽  
pp. 1249-1252
Author(s):  
Marie Fialová ◽  
Ctirad Verner ◽  
Lothar Ebner
Keyword(s):  
Liquid Phase ◽  
Flow Regimes ◽  
Basic Flow ◽  
Axial Dispersion ◽  
Two Phase ◽  
Tube Reactor

The characteristics of axial dispersion in the liquid phase were measured for two basic flow regimes in a horizontal two-phase tube reactor. The data obtained indicate that in some flow regions, axial dispersion can be quite significant.

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