Aerosol penetration in microchannels

Tavakoli, Farzan; Mitra, Sushanta K.; Olfert, Jason S.

doi:10.1016/j.jaerosci.2011.02.007

Cited by 11 publications

(4 citation statements)

References 16 publications

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“…However, the parametric space in which the model has been developed and applied seems to have alleviated these concerns. The issue of slip boundary conditions being necessary instead of zero-velocity boundary conditions to properly describe gas flow in microchannels has been raised (Tavakoli et al 2011). This is true in many cases, however in the cases presented here, as presented in Table 1, the value of the system Knudsen number indicates that the systems are within the continuum regime (Kn < 0.01).…”

Section: Discussionmentioning

confidence: 92%

“…This is true in many cases, however in the cases presented here, as presented in Table 1, the value of the system Knudsen number indicates that the systems are within the continuum regime (Kn < 0.01). Also, the concern has been raised that the zero particle concentration boundary condition may not be valid for systems with particle diameters less than 20 nm (Tavakoli et al 2011). This concern states that this condition is called into question when the characteristic length (2 a t ) is comparable to the thermal stopping distance l, where l is defined as…”

Section: Discussionmentioning

confidence: 99%

“…Likewise, as instruments for scientific investigation such as mass spectrometers continue to advance, ultrafine particle transport in bent microtubes will be of greater interest. Additionally, as the science and engineering of microfluidic devices progresses, particle deposition leading to fouling and blocking will become an issue of growing concern (Sharp and Adrian 2005;Tavakoli et al 2011;Marshall and Renjitham 2015).…”

Section: Introductionmentioning

confidence: 99%

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

Casella

Loyalka

2016

Aerosol Science and Technology

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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/cm 3 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.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Casella

Loyalka

2016

Aerosol Science and Technology

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“…In this work, we implemented the fully resolved direct numerical simulation (FR-DNS) ( Maxey, 2017 ) based on immersed boundary-lattice Boltzmann method (IB-LBM) to consider all the forces and the finite-size effect. By doing this, the construction of the complicated force model acting on a particle is avoided, while it is the key in the conventional Euler-Lagrangian method based on a point particle model ( Akhatov et al, 2008b , Lee et al, 2013 , Tavakoli et al, 2011 ). The current study aims to present a detailed and consolidated comparison between single particle focusing behavior in the air–particle system and the conventional liquid–particle system.…”

Section: Theoretical Analysismentioning

confidence: 99%