A continuum-based multiphase DNS method for studying the Brownian dynamics of soot particles in a rarefied gas
Artikel i vetenskaplig tidskrift, 2019
In the mitigation of particulate matter (PM) using filters, the interplay between particle motion, geometry and flow conditions determines the overall performance. In such flows, molecular effects on the particle motion manifest as impeded momentum transfer and a meandering Brownian motion. Other particles and walls induce hydrodynamic interactions, which may further influence PM nucleation, growth and aggregation. Here, we formulate a multiphase direct numerical simulation framework to investigate these complex flows by including the molecular interactions in a consistent manner.
The basis for this framework is a coupling between the Langevin description of particle motion with a mirroring immersed boundary method. We show that the method is able to capture the diffusion dynamics of a Brownian particle, including its transition from a particle-inertia dominated, correlated ballistic regime to a non-correlated diffusive one, and that the method also can be used to reproduce the meandering motion of realistic soot particles.
The basis for this framework is a coupling between the Langevin description of particle motion with a mirroring immersed boundary method. We show that the method is able to capture the diffusion dynamics of a Brownian particle, including its transition from a particle-inertia dominated, correlated ballistic regime to a non-correlated diffusive one, and that the method also can be used to reproduce the meandering motion of realistic soot particles.
Langevin dynamics
Nanoparticles
DNS
Rarefied flow
Immersed boundary method
Brownian dynamics
Författare
Ananda Subramani Kannan
Chalmers, Mekanik och maritima vetenskaper, Strömningslära
Vasilis Naserentin
Chalmers, Matematiska vetenskaper, Tillämpad matematik och statistik
Aristotelio Panepistimio Thessalonikis
Stiftelsen Fraunhofer-Chalmers Centrum för Industrimatematik
Andreas Mark
Stiftelsen Fraunhofer-Chalmers Centrum för Industrimatematik
Dario Maggiolo
Chalmers, Mekanik och maritima vetenskaper, Strömningslära
Gaetano Sardina
Chalmers, Mekanik och maritima vetenskaper, Strömningslära
Srdjan Sasic
Chalmers, Mekanik och maritima vetenskaper, Strömningslära
Henrik Ström
Chalmers, Mekanik och maritima vetenskaper, Strömningslära
Chemical Engineering Science
0009-2509 (ISSN)
Vol. 210 115229En kontinuummodell för Brownsk rörelse i förtunnande gas-partikelflöden
Vetenskapsrådet (VR) (2015-04809), 2016-01-01 -- 2019-12-31.
Drivkrafter
Hållbar utveckling
Ämneskategorier
Energiteknik
Kemiteknik
Annan fysik
Nanoteknik
Strömningsmekanik och akustik
Fundament
Grundläggande vetenskaper
DOI
10.1016/j.ces.2019.115229