Abstract
The research was performed in order to obtain the physical picture of the movement of condensed droplets and solid particles in the flow of natural gas in elbows and T-junctions of the linear part of the main gas pipeline. 3D modeling of the elbow and T-junction was performed in the linear part of the gas main, in particular, in places where a complex movement of multiphase flows occurs and changes its direction. In these places also occur swirls, collisions of discrete phases in the pipeline wall, and erosive wear of the pipe wall. Based on Lagrangian approach (Discrete Phase Model – DPM), methods of computer modeling were developed to simulate multiphase flow movement in the elbow and T-junction of the linear part of the gas main using software package ANSYS Fluent R17.0 Academic. The mathematical model is based on solving the Navier–Stokes equations, and the equations of continuity and discrete phase movement closed with Launder–Sharma (k–e) two-parameter turbulence model with appropriate initial and boundary conditions. In T-junction, we simulated gas movement in the run-pipe, and the passage of the part of flow into the branch. The simulation results were visualized in postprocessor ANSYS Fluent R17.0 Academic and ANSYS CFD-Post R17.0 Academic by building trajectories of the motion of condensed droplets and solid particles in the elbow and T-junction of the linear part of the gas main in the flow of natural gas. The trajectories were painted in colors that match the velocity and diameter of droplets and particles according to the scale of values. After studying the trajectories of discrete phases, the locations of their heavy collision with the pipeline walls were found, as well as the places of turbulence of condensed droplets and solid particles. The velocity of liquid and solid particles was determined, and the impact angles, diameters of condensed droplets and solid particles in the place of collision were found. Such results provide possibilities for a full and comprehensive investigation of erosive wear of the elbow and T-junction of the linear part of the gas main and adjacent sections of the pipeline, and for the assessment of their strength and residual life.
Highlights
The linear part of the gas main consists of straight sections, curves of elastic bending, curves of cold and hot bending, T-junctions, and valves
The research was performed in order to obtain the physical picture of the movement of condensed droplets and solid particles in the flow of natural gas in elbows and T-junctions of the linear part of the main gas pipeline. 3D modeling of the elbow and T-junction was performed in the linear part of the gas main, in particular, in places where a complex movement of multiphase flows occurs and changes its direction
To simulate the motion dynamics of multiphase flow in elbows and T-junctions of the linear part of gas pipeline, the Lagrangian Discrete Phase Model (DPM) was chosen because it makes it possible to build the trajectory of the particles motion of discrete phase in the continuous phase, determine the velocity of the particles motion, which is necessary for finding the intensive collision by liquid and solid particles, carried by the flow of natural gas, to the pipe wall, impact angles in place of collision that are necessary for a detailed examination of erosive wear in the pipes of gas pipelines
Summary
The linear part of the gas main consists of straight sections, curves of elastic bending, curves of cold and hot bending, T-junctions, and valves. To simulate the motion dynamics of multiphase flow in elbows and T-junctions of the linear part of gas pipeline, the Lagrangian DPM was chosen because it makes it possible to build the trajectory of the particles motion of discrete phase in the continuous phase, determine the velocity of the particles motion, which is necessary for finding the intensive collision by liquid and solid particles, carried by the flow of natural gas, to the pipe wall, impact angles in place of collision that are necessary for a detailed examination of erosive wear in the pipes of gas pipelines. The velocity of the contiuous phase at the inlet of a shaped element was determined by calculation of the gas dynamics of the linear part of the elbow and T-junction in ANSYS Fluent R17.0 Academic without taking into accout the presence of the discrete phase in the flow (Doroshenko et al 2016).
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