Banca de DEFESA: ALYSSON NOGUEIRA DE MAGALHAES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ALYSSON NOGUEIRA DE MAGALHAES
DATE: 23/08/2022
TIME: 14:00
LOCAL: Instituto de Física, Sala de Seminários
TITLE:

Analysis of a Rhombic Passive Micromixer of Unbalanced Collisions With Dislocated Subchannels

KEY WORDS:

In this work, we numerically analyze the mixing capabilities of a new type of planar passive
micromixer, which uses unbalanced collisions promoted by asymmetrical subchannels with
sudden displacements. The Navier-Stokes equations, the continuity equation and the
diffusion-convection equation were solved using the finite element method. Among the
boundary conditions used, seven different flows were tested, varying the Reynolds number
from 5 to 100. The main characteristic of the proposed models is the adoption of a
displacement in the widest of the asymmetrical subchannels. These displacements have
constrictions that alter the velocity field, generating faster flow lines and secondary
vortices. These hydrodynamic structures can increase the contact area between two fluids,
favoring their mixing by accelerating the diffusion process. Three models of micromixers
were proposed, where each micromixer has a different displacement following a rule of
proportion. The mixing index, which is a parameter used to measure the efficiency of
micromixers, and the pressure drop for each case were calculated and analyzed. The
simulations showed that the displacements generated expansion vortices and modified the
unbalanced shock in the recombination zones of the micromixers, promoting Chaotic
Advection. All three proposed models, , and , obtained higher efficiencies than the
reference model in all except for . For lower, medium, and higher Reynolds numbers, the
and micromixers showed the highest efficiencies, respectively, with achieving an 85%
mixing at . While had the lowest pressure drops, got the highest due to tighter
displacements.

PAGES: 91
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

Microfluidics, Passive Micromixers, Unbalanced Colisions

BANKING MEMBERS:
Externa ao Programa - 426640 - FABIANE CAXICO DE ABREU GALDINO
Interno - 3934870 - JOSE HENRIQUE ARAUJO LOPES DE ANDRADE
Presidente - 2121376 - MARCOS VINICIUS DIAS VERMELHO