figshare
Browse

sorry, we can't preview this file

UAST_1143548_Supplementary File.docx (5.78 MB)

Monte Carlo N-particle tracking of ultrafine particle flow in bent microtubes

Download (5.78 MB)
Version 2 2016-02-26, 22:40
Version 1 2016-02-06, 20:06
journal contribution
posted on 2016-02-26, 22:40 authored by Andrew M. Casella, Sudarshan K. Loyalka

The problem of large pressure-differential-driven laminar convective–diffusive ultrafine aerosol flow through bent microtubes is of interest in several contemporary research areas including; release of contents from pressurized containment vessels, aerosol sampling equipment, advanced scientific instruments, gas-phase microheat exchangers, and microfluidic devices. In each of these areas, the predominant problem is the determination of the fraction of particles entering the microtube that is deposited within the tube and the fraction that is transmitted through. Due to the extensive parameter restrictions of this class of problems, a Lagrangian particle tracking method making use of the coupling of the analytical stream line solutions of Dean for convective motion and a sampling of a Gaussian distribution for diffusive motion is a useful tool in problem characterization. This method is a direct analog to the Monte Carlo N-Particle method of particle transport extensively used in nuclear physics and engineering. In this work, 10-nm-diameter particles with a density of 1 g/cm3 are tracked within microtubes with toroidal bends with pressure differentials ranging between 0.2175 and 0.87 atmospheres. The tubes have radii of 25 microns or 50 microns and the radius of curvature is either 1 m or 0.3183 cm. The carrier gas is helium, and temperatures of 298 K and 558 K are considered. Numerical convergence is considered as a function of time step size and of the number of particles per simulation. Particle transmission rates and deposition patterns within the bent microtubes are calculated.

Copyright © 2016 American Association for Aerosol Research

History

Usage metrics

    Aerosol Science and Technology

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC