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Turbulent flow interacting with dense granular media: perturbations on the flow structure

Grant number: 19/22691-1
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): February 01, 2020
Effective date (End): September 30, 2020
Field of knowledge:Engineering - Mechanical Engineering - Transport Phenomena
Principal researcher:Erick de Moraes Franklin
Grantee:Fabio Ernesto Mancilla Ramos
Home Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:18/14981-7 - Modeling of dense granular flows: experiments, numerical simulations and stability analyses, AP.JP2

Abstract

The fluidization and transport of granular matter by a fluid flow in turbulent regime are frequently found in nature and industry. Some examples are the aeolian transport of sand in deserts, transport of sand by water in rivers, oceans and open channels, sand transport in dredging and sewer systems, fluidization of grains for gaseification of solid fuels, and pneumatic transport of grains in the food industry. When a granular bed is fluidized or entrained by a fluid flow, individual grains may oscillate at characteristic frequencies; in addition, they may form clusters that oscillate at lower frequencies. The oscillations of granular structures may affect significantly the fluid flow that entrains the grains, in a kind of feedback mechanism. In the case of turbulent flows, these oscillations change the turbulent characteristics, affecting the mean velocities, fluctuations and turbulent kinetic energy. This project consists in an experimental investigation of the interaction between a turbulent flow and a dense granular medium. Experiments will be performed for two cases: (i) solid-liquid fluidized beds and (ii) a horizontal bed load, in order to evaluate the grains-fluid interactions for these cases. The fluid flow will be measured with both a low-frequency (4 Hz) PIV (Particle Image Velocimetry) and a high-speed camera (1 kHz) together with a continuum laser. For the fluidized bed, we will employ the index matching technique between the grain material and the liquid. We intend to obtain the structure of the turbulent flow over a moving bed and within a fluidized bed (mean flow, second order moments, etc.). (AU)

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