Study of the dynamic in gas-solid systems by numerical simulation using particle and finite volume approaches

• Grant number: 10/19769-4
• Support Opportunities: Regular Research Grants
• Duration: May 01, 2011 - June 30, 2013
• Field of knowledge: Engineering - Mechanical Engineering
• Principal Investigator: Helio Aparecido Navarro
• Grantee: Helio Aparecido Navarro
• Host Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

The proposed work is part of a current research project, which the goal is to perform a theoretical study and develop numerical simulations involving dynamic in gas-solid systems. Gas-solid fluidized bed systems can be found in many operations in the chemical, biochemical, petroleum, pharmaceutical, agricultural, food, electronic, and power generation industries. Although the conversion rates of the catalytic reactors and thermal efficiency of energy facilities are directly influenced by the chemical reactions and the heat transfer processes, they are also highly influenced by hydrodynamic processes, which determine the spatial distribution of phases and species involved. As the hydrodynamic is prevalent in the processes of mass and energy transport in certain spatial and temporal scales, is essential to understand its characteristic and behavior. Even today the basic knowledge of the hydrodynamic processes that occur in multiphase flow in the industries is incomplete and insufficient. For that propose would be used the MFIX (Multiphase Flow with Interphase eXchanges) code developed at NETL (National energy Technology Laboratory, U. S. Department of Energy). The present study will analyzed the following results: fluidization curve with the determination of minimum fluidization velocity for particles of B group (Geldart, 1973); the profile of evolution of bubbles in bubbling fluidized beds with central jet; influence of vibration on fluidization, among others. Thus, using the code MFIX we intend to perform numerical simulations of the dynamics of fluidized beds using the techniques: (a) Lagrangian DEM (Discrete Element Method) based on particles and (b) Eulerian based in the discretization of the system in finite volume (two-fluid model for gas and "solid"). The results obtained with the code mfix will be compared with numerical and experimental data from literature and the results obtained with the theoretical study will be implemented in this code (mfix) for validation. (AU)

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MINETO, ANDREZA TANGERINO; DE SOUZA BRAUN, MEIRE PEREIRA; NAVARRO, HELIO APARECIDO; CABEZAS-GOMEZ, LUBEN. Influence of the Granular Temperature in the Numerical Simulation of Gas-Solid Flow in a Bubbling Fluidized Bed. Chemical Engineering Communications, v. 201, n. 8, p. 1003-1020, AUG 3 2014. (10/19769-4, 12/03468-0)

CORREA, L.; LIMA, G. A. B.; CANDEZANO, M. A. C.; BRAUN, M. P. S.; OISHI, C. M.; NAVARRO, H. A.; FERREIRA, V. G.. A C-2-continuous high-resolution upwind convection scheme. International Journal for Numerical Methods in Fluids, v. 72, n. 12, p. 1263-1285, AUG 30 2013. (10/19769-4, 12/03468-0, 09/16954-8, 10/16865-2, 09/15892-9)

CASERTA, ALICE JORDAM; NAVARRO, HELIO A.; CABEZAS-GOMEZ, LUBEN. Damping coefficient and contact duration relations for continuous nonlinear spring-dashpot contact model in DEM. Powder Technology, v. 302, p. 462-479, NOV 2016. (10/19769-4, 12/03468-0)

NAVARRO, HELIO A.; DE SOUZA BRAUN, MEIRE P.. Determination of the normal spring stiffness coefficient in the linear spring-dashpot contact model of discrete element method. Powder Technology, v. 246, p. 707-722, SEP 2013. (10/19769-4, 12/03468-0)