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Comprehensive Euler/Lagrange modelling including particle erosion for confined gas-solid flows

Particuology 2024年第1期84卷 209-235页

作者： Guiherme A.Novelletto Ricardo Martin Sommerfeld Multiphase Flow Systems Institute of Process EngineeringOtto-von-Guericke-University MagdeburgHoher Weg 7b06120Halle(Saale)Germany

The present research aims to assess the capability of a comprehensive Euler/Lagrange approach for predicting gas-solid flows and the associated solid particle *** open-source code OpenFOAM®4.1 was used to carry out the numerical simulations,where the standard Lagrangian libraries were substantially extended to account for all necessary *** are tracked considering both translational and rotational motion as well as all relevant forces,such as gravity/buoyancy,drag and transverse lift due to shear and particle *** tracking time step was dynamically adapted ac-cording to the locally relevant time scales,which drastically reduces computational *** approaches are adopted to model particle turbulent dispersion,particle collisions with rough walls and particle-particle *** solid particle erosion models,available in the literature,were considered to estimate pipe bend *** study cases are provided to validate the adopted nu-merical approach and erosion models *** first case intends to evaluate the ability of the extended CFD code to predict the behaviour of gas-solid flows in pneumatic conveying *** goal is achieved by comparing the numerical results with the experimental data obtained by Huber(1997)and Huber and Sommerfeld(1994,1998)in a pneumatic conveying ***,the importance of considering inter-particle collisions and surface roughness for predicting particle velocity,mass flux and mean diameter distributions in gas-solid flows is *** second and third case intend to evaluate the ability of the erosion models in estimating bend erosion in diluted gas-solid *** erosion data obtained experimentally by Mazumder et al.(2008)and Solnordal et al.(2015)in very dilut pneumatic conveying systems is used for validating the numerical results,neglecting now inter-particle collisions and two-way *** a comprehensive analysis of the different influential properti

关键词： Pneumatic conveying Pipe bend Numerical calculation(CFD) Euler/Lagrange approach erosion models Wall roughness

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Evaluating methods to quantify sediment volumes trapped behind check dams,Saldana badlands(Spain)

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International Journal of Sediment Research 2017年第1期32卷 1-11页

作者： Iván Ramos-Diez Joaquín Navarro-Hevia Roberto San Martín Fernández Virginia Díaz-Gutiérrez Jorge Mongil-Manso Department of Agricultural and Forestry Engineering University of Valladolid Sustainable Forest Management Research Institute Department of Statistics and Operations Research.University of Valladolid Hydrology and Conservation Research Group.Catholic University of vila

The determination of sediment yield in catchments based on the sediment trapped by check dams is becoming a subject of *** fact,several methods have been developed in recent years to estimate the sediment retained by check *** complexity,precision and accuracy of each method vary *** this study,we evaluate the sediment trapped by check dams comparing the Sections method respect to the Prism,Pyramid,DTMs and Trapezoid *** analyzed a sample of 25 check dams(α-1=90%;ε=10%) in the Saldana badlands(Spain).The results showed that the Sections method offered a volume of retained sediment between the others,which gave an absolute variation from 22%to40%.The high variability of the check dam and sediment wedge sizes made necessary to compare methods in groups combining both *** significant differences in sediment volumes could be found between the methods for very small(height(h):1.8-2.3 m;trapped volume(V):6-102 m3) or large check dams(h > 2.3 m;V:165-387 m3),while significant differences are found for small(h < 1.5 m;V:1-229 m3) or middle-sized check dams(h:2.2-3.2 m;V:65-235 m3).Nevertheless,volume differences between groups ranged up to + 25%.For these reason,the size of the check dam,the shape of the sediment wedge and the accuracy of the measure methods must considered when selecting an appropriate method to obtain the volume of retained sediment by check dams.A correct estimation of the sediment retention is needed to evaluate the role and efficiency of check dams in restoration projects or to estimate sediment yields.

关键词： erosion Gullies Check dam construction Sediment retention erosion models Topographic survey

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