Base on DPM model to simulation Sand erosion on PV modules surface

Wang

Proceedings of the Institution of Mechanical Engineers, Part C:

2022

Angle-cutting elbows (ACEs) are important components of pipelines for fluid diversion and distribution. Severe erosion may occur on the internal walls of ACEs used to transport solid–gas/liquid flow. Erosion may cause pipeline failures. Therefore, the ACE erosion is a fundamental problem. However, the literature on the erosion characteristics and structural optimization of ACEs is rarely reported. This study conducts a numerical prediction of solid particle erosion in ACEs with gas–solid flow. Simulation models based on the two-way coupled Eulerian–Lagrangian approach and the E/CRC model are combined with particle-wall rebound models and a user defined function in the dispersed phase model. Simulation results are verified through a comparison with previously reported experimental results. The findings show that serious erosion occurs in the downstream part of the concave wall of ACE, whereas only slight erosion occurs on the convex wall of ACE. Therefore, anti-erosion measures should be adopted for the concave wall of ACEs. In addition, structural optimization of ACEs for erosion reduction is conducted. The optimal cutting angle is 40° > 50°, and the optimal non-dimensional cutting length is <1.05. The influence of fluid parameters on erosion characteristics is also determined. The erosion rate on the concave wall increases linearly with particle diameter and exponentially with inlet velocity.

Section: Simulation Conditionsmentioning

confidence: 64%

“…Solid particles are treated as discrete phases, and particle trajectory are tracked under the Lagrange framework. The differential equation of particle force is expressed as 38 :…”

Section: Numerical Modeling Approachmentioning

confidence: 99%

Numerical prediction of solid particle erosion in angle-cutting elbows with gas–solid flow

Wang

Proceedings of the Institution of Mechanical Engineers, Part C:

2022

“…Tracks of the discrete phase particles are solved by integrating the differential equation of the particle force in the Lagrangian coordinate system, and trajectory of particles and the heat and mass transfer caused by particles can be calculated (Somwangthanaroj and Fukuda, 2020). Assuming that particles have no volume in fluid motion, collisions between particles can be ignored [30,31]. Therefore, the DPM is applicable as long as the fluid is with a low volume fraction of discrete phase.…”

Section: Discrete Phase Modelmentioning

confidence: 99%

Effect of Carbon Particles on Aerodynamic Performance of a Radial Inflow Turbine in Closed Brayton Cycle

2023

Teh. vjesn.

For the closed Brayton cycle using carbon heaters, working fluid contains some solid particles generally. These impurities will enter turbine along with gas, influence aerodynamic performance, and even make turbine work under off-design condition. Therefore, it is necessary to study the influence of particles on turbine. In this paper, a turbine using argon with carbon particles as working fluid is investigated. Particles are assumed to have no volume and are evenly divided into ten different sizes. Based on the discrete phase model (DPM), CFD method is adopted to simulate turbine flow field, and influences of carbon particle mass fraction, particle diameter and incident velocity on aerodynamic performance are analyzed. The results indicate that as particle mass fraction increases, total pressure, static pressure and Mach number decrease significantly, isentropic efficiency decreases slightly, while temperature increases. Collision and rebound of particles in flow field are more intense with a larger particle diameter, but flow field is less influenced under the same mass fraction due to decrease of particle number. Incident velocity has little effect on aerodynamic performance; however, with increase of incident velocity, diameter of particles on blade surface is larger and collision of particles is more intense especially in nozzle. These results will help understand the influence of solid particles on turbines.

“…The benefit of the CFD-based approach is that it gives comprehensive information about the local variations of flow parameters where the measurements are either difficult or impractical to conduct. In the case of a low particle concentration, choosing the CFD-DPM method can improve the calculation efficiency while ensuring calculation accuracy [10,11]. Rui Li et al [12], showed the design optimization of a hemispherical protrusion for mitigating elbow erosion via CFD-DPM.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Erosion Minimization for a Slurry Pump Using Discrete Phase Model Simulations

Kim

Jeon

2022

Applied Sciences

A slurry pump is a device used to transport slurry, which is a mixture of solids and liquids. The slurry pump is subjected to physical erosion, generally resulting from erosion by friction between the solid and liquid particles. This study aimed to analyze the effects of process parameters on the erosion wear of a throat bush, which is the main component of a slurry pump. The erosion rate density (E) was analyzed based on the process parameters, that is, the slurry particle diameter, rotation speed of the impeller, and gap between the impeller and the throat bush. The discrete phase model (DPM) of the slurry pump was simulated using the process parameters. These parameters were optimized to minimize the erosion rate density. The optimization method using design of experiments (DOE) to derive a specific location with the greatest influence of the design variables through the one-way layout method and optimize the response value at that location is a method that efficiently analyzes a large number of cases. The optimization results confirmed that the erosion rate density was reduced in the optimization model compared with the earlier model.