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Liquid-fluidized beds in narrow pipes: dynamics and instabilities

Grant number: 16/18189-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): March 01, 2017
Effective date (End): June 30, 2021
Field of knowledge:Engineering - Mechanical Engineering - Transport Phenomena
Principal researcher:Erick de Moraes Franklin
Grantee:Fernando David Cúñez Benalcázar
Home Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated scholarship(s):18/23838-3 - Bed load and creep flow within a bidisperse granular bed under laminar flow, BE.EP.DR

Abstract

A fluidized bed is a suspension of solid particles (grains) in a vertical tube submitted to an ascendant fluid flow. Given their high heat and mass transfers, fluidized beds are frequently employed for the gasification of solid fuels. Uniform fluidized beds are uncommon in industrial facilities, and usually instabilities appear. These instabilities consist of transverse waves, bubbles, or long bubbles. For liquid-fluidized beds in narrow tubes, the dynamics and instabilities of the beds are not completely understood, and the problem is still open. This project proposes analytical and experimental studies of the grain dynamics and bed instabilities for this specific case. The analytical part will employ some methods of applied mathematics in order to obtain expressions for the growth rates, wavelengths, frequencies, and celerities of instabilities. The experiments will consist of fluidized beds in different tubes, where the individual motion of grains will be filmed with a high-speed camera, the instabilities will be filmed with a high-definition camera, and the fluid flow will be measured with PIV (Particle Image Velocimetry). Numerical codes will be developed to post-process the images. The objectives are to get a better knowledge of the problem, and to obtain expressions for the grains displacements and for the main characteristics of instabilities (growth rates, wavelengths, and celerities).

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Scientific publications
(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)
CUNEZ, FERNANDO DAVID; FRANKLIN, ERICK M. Mimicking layer inversion in solid-liquid fluidized beds in narrow tubes. Powder Technology, v. 364, p. 994-1008, MAR 15 2020. Web of Science Citations: 0.
CUNEZ, FERNANDO DAVID; GOMES DE OLIVEIRA, GABRIEL VICTOR; FRANKLIN, ERICK DE MORAES. Turbulent channel flow perturbed by triangular ripples. Journal of the Brazilian Society of Mechanical Sciences and Engineering, v. 40, n. 3 MAR 2018. Web of Science Citations: 2.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.