Numerical prediction of erosion distributions and solid particle trajectories in elbows for gas–solid flow

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.

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POSSIBILITIES TO DETERMINING THE SOLID PARTICLE TRAJECTORIES ON AN OSCILLATING SEPARATION SCREEN

Journal of Engineering Studies and Research ◽

10.29081/jesr.v20i3.65 ◽

2017 ◽

Vol 20 (3) ◽

Author(s):

EMILIAN MOȘNEGUȚU ◽

VALENTIN NEDEFF ◽

OVIDIU BONTAŞ ◽

NARCIS BÂRSAN ◽

DANA CHIŢIMUȘ

Keyword(s):

Solid Particle ◽

Numerical Data ◽

Solid Particles ◽

Heterogeneous Mixture ◽

Particle Movement ◽

Particle Trajectories ◽

Video Recordings ◽

Working Surface

<p>To understand the process of separating on the sieve of a solid particles heterogeneous mixture has to be known, first of all, the solid particle movement on the working surface. Therefore, in this article is presented a method for determining these characteristics. The working methodology was based on the processing of some video recordings used to obtain some numerical data for the solid particle movement on the oscillating surface, respectively the values for all three axes OX, OY and OZ. These parameters were used to calculate both the speed and acceleration of the solid particle.</p>

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3D Numerical Prediction of Gas-Solid Flow Behavior in CFB Risers for Geldart A and B Particles

Proceedings of the 20th International Conference on Fluidized Bed Combustion ◽

10.1007/978-3-642-02682-9_124 ◽

2009 ◽

pp. 805-811 ◽

Cited By ~ 3

Author(s):

A. Özel ◽

P. Fede ◽

O. Simonin

Keyword(s):

Flow Behavior ◽

Numerical Prediction ◽

Solid Flow

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The Effect of Geometry of Outlet Channel of Nozzle Box on Solid Particle Erosion

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.773.19 ◽

2013 ◽

Vol 773 ◽

pp. 19-24

Author(s):

Li Zhang ◽

Yu Ting Zheng

Keyword(s):

Solid Particle ◽

Flow Characteristics ◽

Solid Particles ◽

Solid Particle Erosion ◽

Particle Erosion ◽

Lagrange Method ◽

Particle Trajectories ◽

Outlet Channel ◽

Control Stage

On the base of the original geometry of the outlet channel of nozzle box, four different geometry of the outlet channel were constructed. Using the Euler-Lagrange method, the flow characteristics of solid particles in the five different channels were numerical simulated. The particle trajectories and the erosion regions were discussed. The analysis showed that the different geometry of the outlet channel would effect the particle erosion in the channel and the stator of the control stage.

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Numerical Study of Solid Particle Erosion in a Centrifugal Pump for Liquid–Solid Flow

Journal of Fluids Engineering ◽

10.1115/1.4043580 ◽

2019 ◽

Vol 141 (12) ◽

Cited By ~ 2

Author(s):

Fen Lai ◽

Yu Wang ◽

Saeed A. EI-Shahat ◽

Guojun Li ◽

Xiangyuan Zhu

Keyword(s):

Centrifugal Pump ◽

Solid Particle ◽

Numerical Study ◽

Middle Part ◽

Economic Losses ◽

Solid Particle Erosion ◽

Centrifugal Pumps ◽

Particle Erosion ◽

Solid Flow ◽

Severe Erosion

Solid particle erosion is a serious issue in centrifugal pumps that may result in economic losses. Erosion prediction in centrifugal pump is complex because the flow field inside it is three-dimensional (3D) unsteady and erosion can be affected by numerous factors. In this study, solid particle erosion of the entire centrifugal pump for liquid–solid flow is investigated numerically. Two-way coupled Eulerian–Lagrangian approach is adopted to calculate the liquid–solid interaction. The reflection model proposed by Grant and Tabakoff and the erosion model proposed by the Erosion/Corrosion Research Center are combined to calculate the erosion rate and predict the erosion pattern. Results show that for the baseline case, the inlet pipe is the least eroded component, whereas the impeller is the most eroded component. The highest average and maximum erosion rates occur at the hub of impeller. The most severe erosion region of a blade is the leading edge with a curvature angle that varies from 55 deg to 60 deg. The most severe erosion region of a volute is in the vicinity of a curvature angle of 270 deg. The impeller erosion pattern, especially the middle part of the hub and the vicinity of the blade pressure side, can be greatly influenced by operation parameters, such as flow rate, particle concentration, and particle size.

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