Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Numerical simulation of hydraulic conveying of solid particles through a narrow elbow
Submission Author:
Elmar Anton Schnorr Filho , SP
Co-Authors:
Elmar Anton Schnorr Filho, Nicolao Lima, Erick de Moraes Franklin
Presenter: Elmar Anton Schnorr Filho
doi://10.26678/ABCM.COBEM2021.COB2021-1511
Abstract
Elbows are ubiquitous elements in industrial pipelines and are subjected to erosion when a solid phase is present in the flow. This work presents a numerical investigation of a solid-liquid flow through a very-narrow elbow pipe, i.e., when the ratio between pipe and particle diameters is small. In the very-narrow case, some particular phenomena like the formation of plugs and even jamming may develop. Here, we investigate the dynamics of particles with 6 mm diameter and density of 1140 kg/m3 generated randomly at a horizontal inlet of a 25.4 mm-ID elbow pipe. The particles are subjected to a fluid flow with inlet mean velocities ranging from 0.06 m/s to 0.1 m/s. The horizontal section has a length of 5D, the vertical section has a length of 2.5D and the elbow radius is 1D. To simulate the transport of solid particles in the very-narrow case we make use of a resolved approach of the CFDEM software, which is a free open-source software that combines LIGGGHTS, for the discrete element method (DEM), and the well-known OpenFOAM, for the continuous phase. The resolved method simulations were first validated against experimental results and showed good agreement for the fluid dynamics. Then, we investigated the effect of different combinations of fluid velocity and particle inlet rate. We observed that the flow pattern varies with the fluid velocity, where, for low velocities, we have an almost static bed in the lower part of the horizontal section that extends until the elbow. We also found the particle rate saturation associated to each flow velocity, \textit{i.e.} the maximum number of particles that enter the domain for a given fluid velocity. To the authors’ knowledge this is the first time a study with very-narrow pipes considering elbows using a resolved method is presented. This work intends to enlighten the particle dynamics in this particular situation.
Keywords
CFD-DEM, narrow pipes, resolved method
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