Effect of the Friction, Elastic, and Restitution Coefficients on the Fluid Dynamics Behavior of a Rotary Dryer Operating with Fertilizer

Abstract

Some fluid-dynamics aspects of a rotary dryer, operating with granular single superphosphate, were investigated experimentally and by coupled discrete element model–computational fluid dynamics (DEM–CFD) simulations. The experimental data of flight holdup and dynamic angle of repose in the upper half flights, at different angular positions, were successfully used to identify the best set of parameters for the spring–dashpot model used in DEM simulations. The smallest deviations from the experimental data were obtained in the simulation whose parameters values were elastic constant k = 400 N/m, friction coefficient μ f = 0.2, and restitution coefficient η = 0.2. The results have shown that the coupled DEM–CFD approach with the selected parameters has been suitable to predict the fluid dynamics behavior of the rotary dryer operating with granular single superphosphate.

Estudo Cinético De Diferentes Cultivares Da Biomassa Do Capim Elefante (Pennisetum Purpureum Schum.)

“…(SILVÉRIO et al 2015, Silvério et al 2012, SILVÉRIO et al 2011 Destre estes estudos a simulação fluidodinâmica computacional tem se mostrado uma ferramenta importante para a compreensão do escoamento das partículas e para o estudo de ângulo de repouso e carregamento de tambores rotativos. (VIEIRA NET0 et al 2017, SILVERIO et al 2015 2014 (a), SILVÉRIO et al 2014(b). Após realizar as simulações analisou cada uma no tempo de 17 segundos e 18.5 segundos, (após a injeção de partículas) para obter as massas contidas nos suspensores em posições 0º, 30º, 60º, 90º, ou seja, as mesmas posições e tempo avaliados experimentalmente por Silvério 2012.…”

Estudo da influência dos coeficientes de atrito estático e fricção de rolamento em simulações DEM de tambores rotativos com suspensores

“…(SILVÉRIO et al 2015, Silvério et al 2012, SILVÉRIO et al 2011 Destre estes estudos a simulação fluidodinâmica computacional tem se mostrado uma ferramenta importante para a compreensão do escoamento das partículas e para o estudo de ângulo de repouso e carregamento de tambores rotativos. (VIEIRA NET0 et al 2017, SILVERIO et al 2015, SILVÉRIO et al 2014, SILVÉRIO et al 2014(b).…”

Solids holdup in flighted rotating drums: An experimental and simulation study

“…The Lagrangian approach is based on the particle-particle interaction forces, while the Euler-Euler approach treats the phases mathematically as continuous and interpenetrating. The Lagrangian approach, which is used in the Discrete Element Method (DEM), has already been employed in several simulation studies of flighted rotating drums [5,[10][11][12]. In this approach, each particle trajectory is calculated considering all the active forces, providing information about particles at the microscopic level and describing the individual trajectory of a particle.…”

“…Numerical simulation studies by using Euler-Euler approach along with the kinetic theory of granular flow have become popular in the field of gas-solid flow, in several applications (fluidized beds, spouted beds, hydrocyclones, rotating drums and other systems) [12][13][14][15][16][17]. The basic idea that governs the granular kinetic theory is that the grains are in a state of continuous and chaotic restlessness within the fluid.…”