Numerical Simulation of Solid-Fluid 2-Phase-Flow of Cutting System for Cutter Suction Dredgers

Abstract The study of the flow characteristics of the solid-fluid two phase flow in the cutter suction dredger is very important for exploring the slurry formation mechanism and optimizing the operational parameters. In this study, standard k-ε model and Multiple Reference Frame are applied to numerically simulate flow field in and around the cutting system, then with the steady convergent result of the simulation as the initial condition, Discrete Phase Mode is used to solve the particle motion equation by fully coupling the continuous phase and the particles. The influence of suction flow velocity and cutter’s rotating speed on particles suction are analyzed, and effectively suctioned particles numbers are also quantitatively studied. The simulation result shows that the DPM model is able to simulate the movement of particles in and around the cutter suction dredger’s cutting system, in the fluid flow filed velocity vector and pressure distribution on different planes show different characteristics, and under higher suction velocity and lower cutter rotating speed more particles are suctioned into the suction inlet. The results can help better understand flow characteristics of solid-fluid 2-phase-flow of cutter suction dredger’s cutting system, and provide theoretical support for relative system design and operational parameters optimization.

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Aerodynamic Characteristics of NACA 23015 Landing Configuration with 20o Flap in Simulated Rain

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.555.108 ◽

2014 ◽

Vol 555 ◽

pp. 108-112

Author(s):

Shahid Latif ◽

Zhou Hong ◽

Muhammad Ismail

Keyword(s):

Heavy Rain ◽

Aerodynamic Characteristics ◽

Continuous Phase ◽

Phase Flow ◽

Discrete Phase Model ◽

Two Phase ◽

Discrete Phase Modeling ◽

Wall Film ◽

Discrete Phase ◽

Simulated Rain

In our numerical simulation the heavy rain effects have been studied on the aerodynamic performance of 2D cambered NACA 23015 airfoil landing configuration with 20o. We have used preprocessing software gridgen for creation of the landing configuration of the airfoil and then creating mesh around it. Fluent is used to solve the conservation equations. We have used discrete phase modeling (DPM) in Fluent to simulate the rain phenomenon in continuous phase flow by using two phase flow approach. In our study the coupling between the discrete and the continuous phase has been activated. In discrete phase model (DPM), we used the wall film model for the interaction of the continuous and discrete phase. The airfoil landing configuration exhibited significant decrease in lift and increase in drag for a given lift conditions in simulated rain. Post processing software like MATLAB, Tec plot and Origin are used to see the effects of the heavy rain and then results obtained are compared with the experimental results. Our numerical results in most of cases show similar trends with the experiments.

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INVESTIGATION OF STRATIFIED WAVY TWO-PHASE FLOW CHARACTERISTICS

Equipment ◽

10.1615/ihtc13.p12.130 ◽

2006 ◽

Author(s):

Marijus Seporaitis ◽

S. Gasiunas ◽

Raimondas Pabarcius

Keyword(s):

Two Phase Flow ◽

Flow Characteristics ◽

Phase Flow ◽

Two Phase

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Investigation of air-water two-phase flow characteristics in a 25.4 mm diameter circular pipe

Progress in Nuclear Energy ◽

10.1016/j.pnucene.2021.103813 ◽

2021 ◽

pp. 103813

Author(s):

Dewei Wang ◽

Shanbin Shi ◽

Yucheng Fu ◽

Kyle Song ◽

Xiaodong Sun ◽

...

Keyword(s):

Two Phase Flow ◽

Flow Characteristics ◽

Circular Pipe ◽

Phase Flow ◽

Two Phase

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Experimental data for the slug two-phase flow characteristics in horizontal pipeline

Data in Brief ◽

10.1016/j.dib.2017.11.026 ◽

2018 ◽

Vol 16 ◽

pp. 527-530 ◽

Cited By ~ 2

Author(s):

Abdalellah O. Mohmmed ◽

Mohammad S. Nasif ◽

Hussain H. Al-Kayiem

Keyword(s):

Experimental Data ◽

Two Phase Flow ◽

Flow Characteristics ◽

Phase Flow ◽

Two Phase

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Combined Electromagnetic Tomography for Determining Two-phase Flow Characteristics in the Submerged Entry Nozzle and in the Mold of a Continuous Casting Model

Metallurgical and Materials Transactions B ◽

10.1007/s11663-011-9553-y ◽

2011 ◽

Vol 42 (6) ◽

pp. 1201-1210 ◽

Cited By ~ 43

Author(s):

Thomas Wondrak ◽

Sven Eckert ◽

Gunter Gerbeth ◽

Konrad Klotsche ◽

Frank Stefani ◽

...

Keyword(s):

Continuous Casting ◽

Two Phase Flow ◽

Flow Characteristics ◽

Submerged Entry Nozzle ◽

Phase Flow ◽

Two Phase ◽

Electromagnetic Tomography

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Experimental Study of Two-Phase Flow Induced by Cavitation Through a Safety Relief Valve

Volume 5: High-Pressure Technology; ASME NDE Division; Rudy Scavuzzo Student Paper Symposium ◽

10.1115/pvp2013-97409 ◽

2013 ◽

Cited By ~ 1

Author(s):

Jorge Pinho ◽

Patrick Rambaud ◽

Saïd Chabane

Keyword(s):

Local Minimum ◽

Two Phase Flow ◽

Flow Characteristics ◽

Control Valve ◽

Recovery Factor ◽

Phase Flow ◽

Relief Valve ◽

Two Phase ◽

Blow Down ◽

Choked Flow

The goal of this study is to understand the behavior of a safety relief valve in presence of a two-phase flow induced by cavitation, in which the mass flux tends to be reduced. Two distinct safety relief valves are tested: an API 2J3 type and a transparent model based on an API 1 1/2G3 type. Instead of using a spring, the design of both valves allows the adjustment of the disk at any desired lift. Tests are conducted with water at ambient temperature. Results show a similar influence of cavitation on the flow characteristics of both valves. The liquid pressure recovery factor FL, which is normally used to identify a choked flow condition in a control valve, is experimentally determined in a safety relief valve. The existence of a local minimum located at a height position L/D = 0.14 indicates in this position, a change on the flow characteristics of both valves. It is verified that the existence of a local minimum in the liquid recovery factor is related to the minimum cross section of the flow, which does not remain constant for every lift positions. Furthermore, it is remarked that in the case of the 2J3 safety valve, the blow down ring adjustment has significant influence on the location of the minimum cross sections of the flow.

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Surveillance Models of Large-Scale ESP With High Viscosity Fluids and Gas

Volume 6: Materials Technology; Polar and Arctic Sciences and Technology; Petroleum Technology Symposium ◽

10.1115/omae2012-83534 ◽

2012 ◽

Author(s):

Lissett Barrios ◽

Stuart Scott ◽

Charles Deuel

Keyword(s):

Large Scale ◽

Two Phase Flow ◽

Electrical Current ◽

High Viscosity ◽

Viscous Fluids ◽

Phase Flow ◽

Centrifugal Pumps ◽

Operational Parameters ◽

Two Phase ◽

Operational Conditions

The paper reports on developmental research on the effects of viscosity and two phases, liquid–gas fluids on ESPs which are multi stage centrifugal pumps for deep bore holes. Multiphase viscous performance in a full-scale Electrical Submersible Pump (ESP) system at Shell’s Gasmer facility has been studied experimentally and theoretically. The main objectives is to predict the operational conditions that cause degradations for high viscosity fluids when operating in high Gas Liquid Radio (GLR) wells to support operation in Shell major Projects. The system studied was a 1025 series tandem WJE 1000. The test was performed using this configuration with ten or more pump stages moving fluids with viscosity from 2 to 200 cP at various speed, intake pressure and Gas Void Fractions (GVF). For safety considerations the injected gas was restricted to nitrogen or air. The ESP system is a central artificial lift method commonly used for medium to high flow rate wells. Multiphase flow and viscous fluids causes problems in pump applications. Viscous fluids and free gas inside an ESP can cause head degradation and gas locking. Substantial attempts have been made to model centrifugal pump performance under gas-liquid viscous applications, however due to the complexity this is still a uncertain problem. The determination of the two-phase flow performance in these harmful conditions in the ESP is fundamental aspects in the surveillance operation. The testing at Shell’s Gasmer facility revealed that the ESP system performed as theoretical over the range of single flowrates and light viscosity oils up to Gas Volume Fractions (GVF) around 25%. The developed correlations predict GVF at the pump intake based on the operational parameters. ESP performance degrades at viscosity higher than 100cp as compared to light oil applications, gas lock condition is observed at gas fraction higher than 45%. Pump flowrate can be obtained from electrical current and boost for all range of GVF and speed. The main technical contributions are the analysis of pump head degradation under two important variables, high viscosity and two-phase flow inside the ESP.

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