Unforced flow regimes in planar baffled reactors with Smooth Periodic Constrictions

• Type: Article in International Scientific Journal
• Date: 2025

Authors

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

Journal

Title: Chemical Engineering Science

Vol. 302

ISSN: 0009-2509

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Associated Projects

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

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17