A continuum-based multiphase DNS method for studying the Brownian dynamics of soot particles in a rarefied gas
Journal article, 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
Author
Ananda Subramani Kannan
Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics
Vasilis Naserentin
Chalmers, Mathematical Sciences, Applied Mathematics and Statistics
Aristotle University of Thessaloniki
Fraunhofer-Chalmers Centre
Andreas Mark
Fraunhofer-Chalmers Centre
Dario Maggiolo
Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics
Gaetano Sardina
Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics
Srdjan Sasic
Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics
Henrik Ström
Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics
Chemical Engineering Science
0009-2509 (ISSN)
Vol. 210 115229A continuum model for Brownian motion in rarefied gas-solid flows
Swedish Research Council (VR) (2015-04809), 2016-01-01 -- 2019-12-31.
Driving Forces
Sustainable development
Subject Categories
Energy Engineering
Chemical Engineering
Other Physics Topics
Nano Technology
Fluid Mechanics and Acoustics
Roots
Basic sciences
DOI
10.1016/j.ces.2019.115229