Lagrangian mixing simulation and quantification of scales

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Joana Matos (Author) Other; Margarida Brito (Author) Other; Madalena M. Dias (Author) FEUP; José Carlos B. Lopes (Author) FEUP; Ricardo J. Santos (Author) FEUP

Journal

Title: Chemical Engineering Science

Vol. 192

Pages: 199-210

ISSN: 0009-2509

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 9 Citations

INSPEC

Associated Projects

LSRE-LCM - Laboratório de Processos de Separação e Reação - Laboratório de Catálise e Materiais

AIProcMat@N2020 - Advanced Industrial Processes and Materials for a Sustainable North Region of Portugal2020

Other information

Authenticus ID: P-00P-2XD

DOI: 10.1016/j.ces.2018.07.035

Abstract (EN): This paper introduces Lagrangian Mixing Simulation (LMS), which is a new method that uses particles to track the flow front between two fluids in a mixer. The line formed by an ensemble of particles enables the calculation of the instantaneous rate of interfacial area generation between the fluids and the computation of segregation scales. LMS uses the Eulerian velocity field from CFD simulation, which has a spatial resolution determined from the flow dynamics, for the simulation of mixing at scales that are several orders of magnitude below the CFD gridscale. Since only the interface between the two fluids is simulated, the LMS is orders of magnitude faster than the flow field simulation. In this work, LMS is applied to 2D CFD simulations of the flow in Confined Impinging Jets (CIJ) reactors for Re = 100, 300 and 500. LMS shows that the interfacial area generation is exponential for chaotic flow regimes (Re = 300 and 500) and linear for steady flows (Re = 100). Moreover, LMS is able to simulate segregation scales smaller than 10( 8 )m, i.e., LMS result spans and overcomes the entire range of spatial scales that have physical meaning.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12