Experimental Characterization of Slug Flow on Solid Particle Transport in a 1 Deg Upward Inclined Pipeline

2013 ◽  
Vol 135 (8) ◽  
Author(s):  
Afshin Goharzadeh ◽  
Peter Rodgers ◽  
Liang Wang
Keyword(s):  
Solid Particle ◽  
Solid Particles ◽  
Particle Suspension ◽  
Two Phase ◽  
Horizontal Orientation ◽  
Suspension Layer ◽  
Load Mode ◽  
Gas Liquid Flow ◽  
Liquid Flows ◽  
Pipe Inclination

This paper presents an experimental investigation on the influence of hydraulic and two phase (gas-liquid) flows on sand dune transportation resulting from a stationary flatbed, for horizontal and 1 deg upward pipe inclination. For gas-liquid conveying of solid particles, pipe inclination resulted in considerably different transport phenomena relative to those observed for horizontal orientation. Key distinguishing features such as backward bed movement and enhanced particle suspension were observed and were found to be highly gas-liquid ratio dependent. Using image processing, the solid particle suspension layer was quantified as a function of the gas-liquid flow. The measurements presented provide fundamental insights into the influence of upward pipe inclination on bed-load mode solid transportation in a closed conduit.

Experimental Investigation of Intermittent Gas-Liquid Flows on Solid Particle Transportation in Inclined Pipelines

2011 ◽  
Author(s):  
Liang Wang ◽  
Afshin Goharzadeh ◽  
Peter Rodgers
Keyword(s):  
Experimental Investigation ◽  
Solid Particle ◽  
Liquid Flow ◽  
Transport Phenomena ◽  
Solid Particles ◽  
Bed Load ◽  
Internal Diameter ◽  
Flow Phenomenon ◽  
Liquid Flows ◽  
Pipe Inclination

Solid particle transport in pipelines by fluids is widely encountered in energy industry processes, such as oil production, drilling of horizontal and inclined wells and mining. In contrast to the intensive research effort that has investigated solid transport in horizontal pipelines, limited studies have been published on solid transportation mechanism generated from an initial stationary particle bed in inclined pipes. Consequently the underlying mechanisms responsible for pipe inclination influence on bed-load transport phenomena have not been extensively assessed, particularly for gas-liquid conveying of solid particles. This paper presents an experimental investigation on the influence hydraulic and two phase (gas-liquid) flows on sand dune transportation resulting from a stationary flat bed as a function of (i) pipe inclination, (ii) gas liquid flow rate and (iii) initial sand bed thickness. Experiments were undertaken in a laboratory environment using a 14 m long transparent Plexiglas loop of 24 mm internal diameter to permit optical access. The three phases used were water, air and sand. High speed digital photography was employed to study the flow phenomenon and characteristics of sand bed transportation for the analysis variables (i) to (iii) under consideration. For hydraulic conveying of solid particles, it was found that 1° upward pipe inclination had negligible influence on both the flow phenomenon and solid-liquid flow pattern transition. In contrast, for gas-liquid conveying of solid particles, pipe inclination resulted in considerably different transport phenomena relative to that observed for the horizontal orientation. Differences such as backward bed movement and enhanced particle suspension were observed, and found to be highly gas-liquid ratio dependent. These measurements provide fundamental insights into the influence of upward pipe inclination on bed-load mode solid transportation in a closed conduit.

Effect of Pipe Inclination on Void Fraction of Two-Phase Gas-Liquid Flow

2015 ◽  
Author(s):  
Stefan aus der Wiesche ◽  
Marek Kapitz
Keyword(s):  
Void Fraction ◽  
Volume Flow ◽  
Two Phase ◽  
Flow Rates ◽  
Mean Values ◽  
Drift Flux ◽  
Flow Test ◽  
Gas Liquid Flow ◽  
Liquid Flows ◽  
Pipe Inclination

Void fraction correlations are widely available in the literature for two-phase gas-liquid flows in pipes, but no general consensus exists with regard to the effect of pipe inclination. By means of an air-water two-phase flow test setup employing quick-closing valves, the pressure drop and the void fraction were systematically measured for various pipe inclinations and volume flow rates. Both mean values and standard deviations were recorded. The experimental data were compared with predictions of representative correlations recommended in the literature. It is found that void fraction predictions of drift-flux models were in excellent agreement with the present measurements.

scholarly journals Influence of Blade Thickness on Solid–Liquid Two-Phase Flow and Impeller Wear in a Ceramic Centrifugal Slurry Pump

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1259
Author(s):  
Yi Tao ◽  
Yongming Bai ◽  
Yingchun Wu
Keyword(s):  
Solid Particle ◽  
Wear Test ◽  
Suction Side ◽  
Solid Particles ◽  
Phase Flow ◽  
Pressure Side ◽  
Particle Trajectories ◽  
Two Phase ◽  
Blade Thickness ◽  
Solid Liquid

The impeller blades of ceramic slurry pumps are usually very thick for the purpose of prolonging the service life. In this paper, numerical simulations and wear test were conducted to investigate the influence of blade thickness on the solid–liquid two-phase flow and impeller wear in a ceramic centrifugal slurry pump. The wear test was conducted for CFD validation. The numerical results show that the incident angles of solid particles increase with increasing blade thickness, which results in larger wrap angles of the solid particle trajectories. The increasing wrap angles of the solid particle trajectories offset the region that the collisions between the blade pressure side and the solid particles side take place towards the impeller exit and lead to more impacts between the solid particles and the blade suction side. The numerical results are in good accordance with the wear pattern of the tested impellers, which demonstrates that the numerical method adopted in this paper is predictable in the abrasion of the impeller of a ceramic centrifugal slurry pump. The experimental results show that an increase in the blade thickness alleviates the abrasion of the leading edges and the pressure side of the impeller blades; however, it also aggravates the abrasion of the blade suction side and decreases the pump performance.

Numerical Investigation of the Effect of Solid Particles on Liquid Holdup in Stratified Wavy Gas-Liquid Flow in Natural Gas Pipelines

2014 ◽  
Author(s):  
Mahdi Jafari ◽  
Zohreh Mansoori ◽  
Majid Saffar Avval ◽  
Goodarz Ahmadi
Keyword(s):  
Liquid Phase ◽  
Natural Gas ◽  
Solid Phase ◽  
Gas Pipeline ◽  
Solid Particles ◽  
Liquid Holdup ◽  
Horizontal Pipe ◽  
Natural Gas Pipelines ◽  
Gas Liquid Flow ◽  
Liquid Flows

The effect of presence of solid particles on stratified wavy gas-liquid flows has been studied. The height of liquid phase in the natural gas pipeline is a key parameter in designing and can affect the corrosion/erosion rate. In present paper, the numerical four-way simulation of solid particles in gas-liquid wavy stratified flow has been used. The computational model is shown to be able to evaluate the effect of the particles on liquid holdup which is critical for gas pipeline design. The particles cause the liquid phase height in horizontal pipe decreases by increasing the solid phase concentration.

scholarly journals Computational fluid dynamics simulation of solid-liquid suspension characteristics in a stirred tank with punched circle package impellers

2020 ◽  
Vol 18 (9) ◽  
Author(s):  
Deyin Gu ◽  
Mei Ye ◽  
Zuohua Liu
Keyword(s):  
Fluid Dynamics ◽  
Power Consumption ◽  
Solid Particle ◽  
Particle Diameter ◽  
Solid Particles ◽  
Stirred Tank ◽  
Impeller Speed ◽  
Particle Suspension ◽  
Liquid Suspension ◽  
Solid Liquid

AbstractSolid-liquid suspension characteristics in a stirred tank with four pitched-blade impellers, circle package impellers, and punched circle package impellers were studied via computational fluid dynamics (CFD) simulation. A classical Eulerian-Eulerian approach coupled with the standard k-ε turbulence model was adopted to simulate the solid-liquid two-phase turbulent flow. The effects of impeller speed, power consumption, impeller type, aperture size/ratio, solid particle diameter and liquid viscosity on the solid particle suspension quality were investigated. Results showed that the solid particle suspension quality was improved with an increment in the impeller speed. Punched circle package impeller could reduce the just suspension speed and improve the level of homogeneity for solid-liquid mixing process on the basis of four pitched-blade impeller and circle package impeller. The optimum aperture ratio and aperture diameter were 11.8% and 8 mm, respectively, for solid particles suspension process in this work. Smaller particle diameter led to smaller settling velocity and higher solid particle suspension quality. More viscous liquid was easier for sustaining the solid particles in suspension state. Meanwhile, punched circle package impeller can reduce the power consumption compared with four pitched-blade impeller and circle package impeller at the same impeller speed, and enhance the solid integrated velocity, turbulent kinetic energy, and turbulent kinetic energy dissipation rate of solid-liquid mixing system at the same power consumption.

Characteristics of Air-Oil Slug Flow in Inclined Pipe Using Tomographic Techniques

2011 ◽  
Author(s):  
Lokman A. AbdulKareem ◽  
V. Hernandez-Perez ◽  
S. Sharaf ◽  
Barry J. Azzopardi
Keyword(s):  
Slug Flow ◽  
Volume Fraction ◽  
Silicone Oil ◽  
Flow Characteristics ◽  
Wire Mesh ◽  
Internal Diameter ◽  
Cross Sectional ◽  
Gas Liquid Flow ◽  
Liquid Flows ◽  
Pipe Inclination

The structure of gas liquid flow in horizontal and vertical pipes to some extent is well understood. However, the situation in inclined pipes is much more difficult with very little work published in literature. Changes in physical phenomena occur as the pipe inclination angle varies from the vertical through to inclined and then to horizontal. This work describes a study carried out at the University Of Nottingham on the effects of inclination on gas / liquid slug flow. Two advanced tomography techniques were applied simultaneously to the flow of a mixture of air and silicone oil in a 67 mm internal diameter pipe and the pipe was inclined at angles 0, 5, 10, 30, 45, 60, 80, 90 degrees. This paper reports on the use of twin plane electrical capacitance tomography (ECT) system developed by TomoFlow electronics Ltd to measure flow characteristics in gas-liquid flows. We report measurements over a range of liquid superficial velocities from 0.05 m/s to 0.5 m/s and gas superficial velocities from 0.06 m/s to 6 m/s at all the above angles in a pipe 6 m long. A second technique, Capacitance Wire Mesh Sensor (WMS) developed at Forschungszentrum Rossendorf-Dresden/Germany was also present in the tests, The results for the two sensors are shown to be within 1% of each other in some instances when comparing cross-sectional averaged void fraction. The data was recorded at an acquisition frequency of 1000 Hz over an interval of 60 seconds. This enabled an examination of the flow to be carried out at several levels of complexity. Both measuring sensors provide time and cross-sectionally resolved information about the spatial distribution of the phases. In present paper, the effect of inclination on the characteristics of slug flow is presented. Radial gas volume fraction profiles and bubble size distributions were also processed from the wire-mesh sensor output. The results indicate that the pipe inclination has a significant effect on the slug flow characteristics.

Crisp and Fuzzy Classifiers in the Two-Phase Gas-Liquid Flow Diagnostics

2012 ◽  
Vol 17 (4) ◽  
pp. 385-394
Author(s):  
Paweł Fiderek ◽  
Tomasz Jaworski ◽  
Robert Banasiak ◽  
Jacek Kucharski
Keyword(s):  
Pattern Recognition ◽  
Flow Pattern ◽  
Liquid Flow ◽  
Confusion Matrix ◽  
Clustering Algorithms ◽  
Prediction Performance ◽  
Two Phase ◽  
Fuzzy Classifiers ◽  
Gas Liquid Flow ◽  
Liquid Flows

Abstract The following paper presents results of common clustering algorithms use, both crisp and fuzzy, for flow pattern recognition of two-phase gas-liquid flows observed in horizontal pipeline. Obtained results of HCM, FCM, and kNN clustering algorithms were presented in a form of confusion matrix and compared via its prediction performance.

Cost-based recurrence analysis of conductance time series for gas–liquid two-phase flow system

2021 ◽  
pp. 2150161
Author(s):  
Lusheng Zhai ◽  
Yuqing Wang ◽  
Jie Yang ◽  
Yinglin Wu
Keyword(s):  
Flow Pattern ◽  
Lorenz System ◽  
Flow System ◽  
Recurrence Plot ◽  
Flow Structures ◽  
Two Phase ◽  
Structure Information ◽  
Flow Pattern Transition ◽  
Gas Liquid Flow ◽  
Liquid Flows

Gas–liquid two-phase flows are frequently encountered in chemical and nuclear industries. The study of gas–liquid flow structures is of great significance for understanding the mechanisms of the flow pattern transition. In this paper, a direct-image multi-electrode conductance sensor (DMCS) was used to detect the structure information of vertical gas–liquid flows. Recurrence plot (RP) and cost-based recurrence plot (CBRP) are validated using typical nonlinear systems, i.e. Lorenz system and Hénon map, and used to analyze the signals collected by the DMCS. The results indicate that the determinism (DET) derived from the CBRP is sensitive to flow pattern evolution, and can also demonstrate the internal differences in the same flow patterns.

Water Droplet With Carbon Particles Moving Through High-Temperature Gases

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Roman S. Volkov ◽  
Maxim V. Piskunov ◽  
Genii V. Kuznetsov ◽  
Pavel A. Strizhak
Keyword(s):  
High Temperature ◽  
Water Droplet ◽  
Solid Particles ◽  
Optical Methods ◽  
Solid Inclusion ◽  
Two Phase ◽  
Carbon Particles ◽  
Liquid Evaporation ◽  
Liquid Flows ◽  
Particle Imaging

An experimental investigation was carried out on the influence of solid inclusions (nonmetallic particles with sizes from a few tens to hundreds of micrometers) on water droplet evaporation during motion through high-temperature gases (more than 1000 K). Optical methods for diagnostics of two-phase (gas and vapor–liquid) flows (particle image velocimetry (PIV) and interferometric particle imaging (IPI)) were used. It was established that introducing foreign solid particles into the water droplets intensifies evaporation rate in high-temperature gas severalfold. Dependence of liquid evaporation on sizes and concentration of solid inclusion were obtained.

scholarly journals APPLICATION OF FRACTIONAL CALCULUS FOR MODELLING OF TWO-PHASE GAS/LIQUID FLOW SYSTEM

2017 ◽  
Vol 7 (1) ◽  
pp. 42-45 ◽  
Author(s):  
Jacek Nowakowski ◽  
Piotr Ostalczyk ◽  
Dominik Sankowski
Keyword(s):  
Fractional Calculus ◽  
Order System ◽  
Two Phase ◽  
Flow Parameters ◽  
Wide Range ◽  
Flow Components ◽  
Gas Liquid Flow ◽  
Different Diameters ◽  
Liquid Flows ◽  
New Applications

In recent years the use of fractional calculus in control system identification is becoming popular and it has found new applications. The paper presents application of fractional calculus for modelling of two-phase gas/liquid flows in a test rig. The installation consists of three horizontal and vertical measuring segments with different diameters, which allow to investigate flows in a wide range of parameters. Flow components supply is measured/controlled by NI PXI system and a set of flow meters/controllers. The paper presents model of the two-phase flow in the above described installation, which leads to precise and accurate flow mathematical model. The main goal of the flow model is to describe steady flow parameters, especially the flow fractions, or type of the flow. The model describes flows more accurately, that classical second order system model.

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