Unforced flow regimes in planar baffled reactors with Smooth Periodic Constrictions

• Tipo: Artigo em Revista Científica Internacional
• Data: 2025

Autores

Brandão, SP (Autor) Outra; Brito, MS (Autor) Outra; A. Ferreira (Autor) FEUP; Ricardo J. Santos (Autor) FEUP; Brito, MSCA (Autor) FEUP

Revista

Título: Chemical Engineering Science

Vol. 302

ISSN: 0009-2509

Editora: Elsevier

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Projetos Associados

LA LSRE-LCM - Financiamento Plurianual 2020-2023 para a Unidade LA LSRE-LCM Laboratório de Processos de Separação e Reacção - Laboratório de Catálise e Materiais

Outras Informações

ID Authenticus: P-017-A6A

DOI: 10.1016/j.ces.2024.120873

Abstract (EN): Flow regimes in two planar reactors with Smooth Periodic Constrictions, commonly used as Oscillatory Flow Reactors (OFRs), are characterized by Computational Fluid Dynamics (CFD) and Planar Laser Induced Fluorescence (PLIF) without applying the typical external oscillation to the flow. The unforced flow frequencies were identified by spectral Fourier analysis. Three different flow regimes were identified: steady/stratified laminar at low Reynolds numbers, unsteady laminar at intermediate Re, and turbulent flow at high Re. The CFD model was validated by comparison with the PLIF experimental results. A dual-double cascade, a 2D turbulence phenomenon, was detected, emphasizing the significant role of dynamic vortices' formation in the reactors' flow. Additionally, the geometric parameters, such as the reactor's depth and constriction to the chamber's width ratio, have shown a great impact on onsetting a dynamic flow. These results provide insights into the mixing mechanisms and dominant scales of the unforced flow, establishing the basis for future optimization of oscillatory parameters in OFRs.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 17