Banca de DEFESA: KLEBER MARTINIANO DE LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : KLEBER MARTINIANO DE LIMA
DATE: 15/12/2021
TIME: 14:00
LOCAL: Videoconferência - Google Meet
TITLE:

SIMULATION IN FLUIDIZED BED CFD WITH GELDART GROUP B PARTICLES IN A SOLID-GAS TWO-PHASE SYSTEM. 

KEY WORDS:

Fluidization, Euler-Euler, B particles, CFD, Ansys Fluent.

PAGES: 97
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

Currently, the biggest challenges faced by various industrial sectors, including pharmaceutical, food, chemical and agricultural, among others, consist of intermittent searches regarding the optimization of processes that reduce costs, time and maximize the operational efficiency of the mixing steps, drying, coating, granulation, gasification, among others. In this context, fluidized beds arise, which can be communicated to processes that involve the contact between the solid particulate and the fluid phase. Therefore, this work aims, from an Euler-Euler approach in a gas-solid system, to evaluate the fluid dynamic properties of inert particles of Geldart's group B in a fluidized bed. To achieve the above-mentioned purposes, it is intended to apply mathematical modeling via simulation in a CFD environment with the aid of the commercial application Ansys Fluent 2021 R2 academic version. The geometry was constructed in a two-dimensional form and a mesh test was carried out to verify if this influenced the results. The turbulence model test was also carried out and the most suitable for the simulations (k-ε or SST) was evaluated. The interaction between the phases was provided by the Syamlal-O'Brien equation and the value of the particle-particle restitution coefficient of 0.9. The particle viscosity was calculated by the Kinetic Theory of Granular Flow (KTGF). The results induced that the most suitable mesh to perform the simulations presented an aspect close to 1, excellent orthogonal quality and excellent asymmetry, besides presenting lower computational cost and less error (4.4%). The turbulence model chosen was the K-ɛ, as it has a lower computational cost and because it achieves faster fluidization than the SST model. The minimum fluidization velocity found was 0.3 m / s. It was also observed that at air velocity above 0.5 m/s there was a formation of axial slugs. Furthermore, in simulations with addition greater than V mf vortices were found. The simulations made it possible to visualize and evaluate the phenomena that occurred internally in the fluidized bed. In general, the results obtained from the phenomena of pressure drop, turbulence and influence of the gas influence rate associated with these phenomena will contribute to high levels of convective coefficients and thus collaborate in the efficiency of industrial processes.

BANKING MEMBERS:
Externo à Instituição - FABIO BENTES FREIRE - UFSCAR
Presidente - 2278469 - LEONARDO MENDONÇA TENÓRIO DE MAGALHÃES OLIVEIRA
Interno - 1797785 - LUCAS MEILI
Interno - 3182573 - RODOLFO JUNQUEIRA BRANDAO