TY - JOUR AU - Das, Shyam Sumanta AU - Sobral, Yuri Dumaresq AU - Cunha, Francisco Ricardo da PY - 2017/01/10 Y2 - 2024/03/28 TI - NUMERICAL INVESTIGATIONS OF INSTABILITIES IN GAS-SOLID FLUIDIZED BEDS JF - Revista Interdisciplinar de Pesquisa em Engenharia JA - Rev. Interd. Pesq. Eng. VL - 2 IS - 12 SE - Artigos DO - 10.26512/ripe.v2i12.21346 UR - https://periodicos.unb.br/index.php/ripe/article/view/21346 SP - 86-103 AB - <p>A gas-solid fluidized bed consists of mixture of gas-solid in which the particles were suspended by an imposed upward flow. In the present paper, we have carried out two dimensional numerical simulations of gas-solid fluidized bed. CFD-DEM (Computational&nbsp;fluid dynamics-discrete element modeling) approach is used to model two phase flow&nbsp;composed of solid particles and gas inside the fluidized bed. It uses Eulerian and Lagrangian&nbsp;methods to solve fluid and solid particles respectively. Numerical simulations were carried&nbsp;out for various inlet gas velocities. The aim of the present work to investigate the instabilities associated with the fluidized bed. Spectral analyses were carried out to investigate the nature&nbsp;of the signals. The appearance of the bubble kind structure in the fluidized bed within few&nbsp;seconds of injection of gas shows the occurrence of instability in the fluidized bed system.&nbsp;This instability give rise to the formation bubbles of different sizes.</p> ER -