Numerical 3D simulation of developing turbulent stratified gas-liquid flow in curved pipes consisting of entrained particles through this type of flow

Document Type : Article

Authors

1 Mechanical engineering, Amirkabir University of Technology, Tehran, Iran

2 Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran

3 Energy Reseach Center, Amirkabir university of technology

4 Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, New York, USA

Abstract

Predicting multiphase flows in curved pipes is of great importance in industrial equipment. In the present study, a computational model for predicting the velocity profile is developed and used to study the developing turbulent gas-liquid- solid three dimension flow in curved pipes. In order to discretize and solve the three-dimensional steady-state momentum equations, the finite volume scheme on staggered grids besides central difference and QUICK scheme have been used. Moreover, the k-ε model is employed to reflect the nature of turbulence in the flow. In order to address the needs for sooner convergence and convenient mapping of the physical domain, the computations have been performed in an extended toroidal coordinate system. Particle tracking has been done using Lagrangian approach in which two-way coupling regime is considered. In terms of validation, the numerical simulation results for the straight duct (infinite curvature), have been compared with the analytical solution and previous experimental results. Moreover, injection of particles through the flow indicates that, in each section of the bend, trade-off between centrifugal and pressure gradient forces plays a key role on particles motion. In last section, the effects of particle diameter and bend curvature on particle motion have been examined.

Keywords

Main Subjects

References

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Scientia Iranica
Volume 25, Issue 6: Special Issue Dedicated to Professor Goodarz Ahmadi - Serial Number 6
Transactions on Mechanical Engineering (B)
November and December 2018
Pages 3243-3257

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  • Receive Date: 06 May 2018
  • Accept Date: 27 August 2018

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