Dyrney Araújo dos Santos

Dyrney Araújo dos Santos
Universidade Federal de Goiás | UFG · Institute of Chemistry - Chemical Engineering Course

Prof. Dr.

About

29
Publications
1,686
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393
Citations
Introduction
Prof. Dyrney is currently working on systems involving multiphase fluid-particle flows (e.g., spouted beds, fluidized beds, rotary drums, fluidized bed opposed gas jet mills, etc) through numerical simulations using the Euler-Euler and the Euler-Lagrange approaches. He is interested in working with open-source software, such as OpenFOAM, LIGGGHTS, CFDEM, ParaView, and Gmsh. To contact him, please send an email to dyrney@ufg.br

Publications

Publications (29)
Article
Full-text available
The present work focuses on investigating the residence time behavior of microparticles in a concurrent downer reactor through experiments and numerical simulations. For the numerical simulations, a three-dimensional multiphase model was developed using the Euler-Lagrange approach. The experiments were performed in a 0.8 m-long steel reactor with g...
Article
A systematic investigation concerning the particle mixing behavior in a flighted rotary drum through experiments and numerical simulations using DEM was performed in this study. The DEM input parameters were calibrated herein based on experimental observations. The effects of the number of flights, the height of the flights, and the drum filling de...
Article
This paper aims to systematically investigate the cataracting-centrifuging transition in a rotary drum involving spherical and nonspherical particles by using the Multiphase Granular Eulerian Model (MGEM). The effects of drum length and particle shape on the cataracting-centrifuging transition behavior were analyzed. The results showed that drum le...
Article
Full-text available
The particle dynamics in a flighted rotary drum operated with different numbers of flights and under different operating conditions was simulated by using both the Eulerian (computational fluid dynamics, CFD) and the Lagrangian (discrete element method, DEM) approaches. The simulated solid holdups in the flights as a function of the flights’ tip an...
Article
Full-text available
The compressible and turbulent gas-solid multiphase flow inside a fluidized bed opposed jet mill was systematically investigated through numerical simulations using the Euler-Euler approach along with the kinetic theory of granular flow and frictional models. The solid holdup and nozzle inlet air velocity effects on the gas-solid dynamics were asse...
Article
A low-cost and non-intrusive methodology using a solidification-slicing approach was proposed in this work for the investigation of radial and axial segregation phenomenon in a spouted bed. The effects of diameter, density, and shape of the particles, as well as the initial particle loading, and the inlet air velocity on segregation, were qualitati...
Article
In this study, the volume of fluid multiphase model (VOF) along with the adaptive mesh refinement method (AMR) was used for the droplet-based flow phenomenon investigation inside a microfluidic device fabricated in poly(dimethylsiloxane) (PDMS). The proposed model was qualitatively and quantitatively validated based on experimental observations. Th...
Article
Computational simulation is an important tool for design and improvement of industrial units. Computational fluid dynamics (CFD) coupled with the discrete element method (DEM) has been applied to simulate drying equipment that usually involves gas–solid flow. For reliable results of CFD–DEM simulations, the properties related to the interactions of...
Article
A systematic study upon the Eulerian approach capability in predicting irregular particle (non-spherical) dynamics inside an unbaffled rotary drum was carried out through the investigation of different particle-particle interaction models and wall boundary conditions. The drum length effect on particle dynamics was also analyzed. The frictional vis...
Article
In this work we investigated the effects of the drum rotation speed, liquid-phase ratio, granulation time, and drum hold-up on the single super-phosphate granulation performance in a rotary drum. Regression techniques were used to quantify the effects of those variables on the granulation efficiency and product properties. Equations to predict thes...
Article
This paper involves an experimental and numerical study on the grinding media dynamics inside a baffled ball mill under different solid flow regimes: cascading, cataracting and centrifuging. The Eulerian approach was used for all simulations and the boundary condition at the drum wall was investigated by means of the specularity coefficient paramet...
Article
Full-text available
Rotary drums can show different granular flow regimes each one with its own specific flow behavior, which increase the complexity in their study. The way particles move inside the rotary drum is directly related to the mass and energy transfer rates, and consequently to the process performance. Thus, an experimental investigation regarding the tran...
Article
The present paper describes an experimental and numerical study conducted to investigate the particle movement inside an unbaffled rotary drum under different operating conditions and using particles of different shapes. The Discrete Element Method (DEM) was used in order to describe the granular flow pattern properly, along with the clumping metho...
Article
This paper quantitatively and qualitatively evaluates the mixture and segregation processes in an unbaffled rotary drum induced by particle size and density differences. We also assessed the initial particle loading effect using side–side and top–bottom particle configurations. The suitable segregation index and the segregation rate quantified the...
Article
Directly heated rotary dryers are widely used in various industries and have been the subject of numerous studies. However, few studies have focused on the behavior of particle dynamics in these dryers, and most of them are still designed based on empirical data and pilot plant scale-ups. This paper reports on a study of the effect of operating con...
Article
This paper aims to investigate the particle dynamic behavior in a rotating drum operating in a rolling regime under different rotating velocity, based on experimental results and simulations. Simple superphosphate fertilizer (SSP) was used as particulate matter in the current study. The Eulerian–Eulerian multiphase model along with the kinetic theo...
Article
An experimental and numerical investigation of the hydrodynamic behavior in a rotating drum, operated in the rolling regime, was performed in the present work. For all the simulations, the Euler-Euler approach was used. A high-speed video camera technique was used in order to measure, experimentally, the particle velocity distribution. The CFD simu...
Article
In this work the particle dynamic behavior in a rotating drum under different operating conditions has been analyzed based on experimental results and simulations. The Eulerian–Eulerian multiphase model with the kinetic theory of granular flow was used in the simulations. In order to evaluate the simulation results, different solid flow regimes and...
Article
AbstractA hybridisation study of drag models was performed in a conical–cylindrical spouted bed by means of CFD simulations using an Eulerian–Eulerian multiphase model. In order to evaluate the simulation results, time‐averaged velocity distributions of the particulate phase were compared with the experimental data obtained by means of an optical f...
Article
Many spouted bed applications involve mixtures of particles of different sizes, shapes, or densities. Depending on the characteristics of the particle mixture, undesirable phenomena such as particle segregation may occur, mainly due to differences in terminal velocities. Thus, a better understanding of the fluid dynamics of particle mixtures is sti...
Article
Average particle velocity measurements were carried out in a conical-cylindrical spouted bed made of acrylic. In this study an intrusive fiber optical technique which is based on a cross-correlation function between signals from its two channels was used. For a non-intrusive measurement in order to compare with the intrusive technique, images of pa...
Article
In this work the disturbances in the hydrodynamic behavior caused by the use of an optical fiber probe in a conical-cylindrical spouted bed have been analyzed based on experimental results and CFD simulations using an Eulerian-Eulerian multiphase model. The insertion of the probe inside the spouted bed caused a decrease in the fountain height and i...
Article
This article aims to assess the influence of the way of simulating monoparticles as just monoparticles or as a mixture of particles, the latter, unlike the first, considering the effect of particle-particle interaction. The Eulerian–Eulerian multiphase model is used in the computational simulation of fluid dynamics of spouted beds and compared with...

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