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Tuesday, May 12, 2020 | History

2 edition of Aerodynamic sizing of non-spherical particles found in the catalog.

Aerodynamic sizing of non-spherical particles

I. M. Marshall

Aerodynamic sizing of non-spherical particles

by I. M. Marshall

  • 246 Want to read
  • 28 Currently reading

Published .
Written in English


Edition Notes

Thesis (Ph.D.) - Loughborough University, 1996.

Statementby I.A. Marshall.
ID Numbers
Open LibraryOL17118364M

  In aerodynamics, it is well known that the movement of fine particles, the size range from submicron to 10 µm level, follows that of the air that carries them, and the smaller the particles, the shorter the time lag necessary for the particles to follow it. The size of cigarette smoke particles exhaled from the smoker was reported to be Cited by: 9.   The article represents the discussion of several separate directions of investigations, which are performed by TsAGI flight vehicles aerodynamics specialists at the time. There are some major trends of classical layout of route aircraft and also peculiarities of some prospective flight vehicles. Also there are some hypersonic vehicles aerodynamics questions examined along with problems of Cited by: 1.

  The aerodynamic diameter of non-spherical particles (Timbrell, ) is defined as the diameter of a unit-density (1 g/cm 3) sphere that has the same settling velocity as that of a non-spherical particle. Given that the settling velocity is directly related to deposition by gravitational settling, this diameter can only be used for non Cited by: 2. Both instruments are capable of sizing several thousand particles a second, making it possible to obtain aerodynamic particle size distributions in a few seconds compared with up to 1 hour per measurement using compendial methods that are based on either the multistage liquid impinger or cascade by:

Light scattering by particles is the process by which small particles (e.g. ice crystals, dust, atmospheric particulates, cosmic dust, and blood cells) scatter light causing optical phenomena such as rainbows, the blue color of the sky, and halos.. Maxwell's equations are the basis of theoretical and computational methods describing light scattering, but since exact solutions to Maxwell's. Most of these instruments deliver only equivalent particle size, e.g., mobility equivalent diameter or aerodynamic diameter of spherical particles. However, most of the real-life particles, such as Diesel soot and engineered nanoparticles, are non-spherical agglomerates.


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Aerodynamic sizing of non-spherical particles by I. M. Marshall Download PDF EPUB FB2

Such a particle-sizing system, the TSI Aerodynamic Particle Sizer, is challenged with solid, non-spherical particles of known aerodynamic diameter to assess the influence of particle shape on instrument response.

The aerodynamic diameter of the non-spherical particles is also determined under gravitational : I.A. Marshall. The aerodynamic diameter of the\ud non-spherical particles is also determined under gravitational settling. Deposits that\ud had been size-separated are resuspended for aerodynamic sizing by the APS.

The\ud experimental study is supplemented by a theoretical investigation of the relative\ud effects of particle density and shape on APS-measured : I.A. Marshall. The oscillation measurements yield particle size estimates within % of the values obtained by the springpoint method for spherical particles and within % for the non-spherical GeO 2 particles.

The oscillation method can be applied to non-spherical particles and it can be applied to particles for which springpoints are impossible to by: Abstract Effective densities derived from combined mobility and aerodynamic sizing provide a valuable tool for the characterization of non-spherical particles.

Different effective densities have been introduced depending on the primary measurement parameters (mass, mobility and/or aerodynamic size) and the flow regime (transition, free-molecular).Cited by: For non-spherical particles collected in an impactor, for example, the aerodynamic diameter of a particle of arbitrary shape and density refers to the size of a spherical particle of unit density that would deposit on a given impactor surface.

Source: PAC,62, A simplified theoretical analysis indicates that this instrument will undersize non-spherical particles, but the current Behaviour in a TSI Aerodynamic Particle Sizer 89 model requires further development to define the precise conditions experienced by aerosol particles as they are accelerated through the ultra-Stokesian flow conditions of the measurement by: Effective densities derived from combined mobility and aerodynamic sizing provide a valuable tool for the characterization of non-spherical particles.

Different effective densities have been. Drag of non-spherical particles can be framed if first we analyze aerodynamics of spherical particles. Several analytical, numerical and experimental studies can be found that are focused on the aerodynamics and, in particular, on the drag of spheres [13].Cited by: Electromagnetic and Light Scattering by Nonspherical Particles XVI Article (PDF Available) in Journal of Quantitative Spectroscopy and Radiative Transfer A1-A4 July with Reads.

This review paper is concerned with the current status of the understanding of the motion of non-spherical or irregular particles. Most work up to date dealing with particle-fluid interaction has. property closely related to the aerodynamic equivalent diameter for sizes between and 20 µm (Baron and Willeke ).

A fraction of the sampled aerosol is passed through a system of two acceleration nozzles. Single particles are counted and size classified by measuring the time-of-flight for transport between two laser beams.

Particle Morphology and Density Characterization by Combined Mobility and Aerodynamic Diameter pronounced effects on particle sizing methods. Atmospheric aerosol particles are often nonspherical. particlesinthe–nmrangewerenonspherical(Dicketal.

Soot aggregates are a type of non-spherical particles that is almost always. The dimension of particles in the gas phase is commonly characterized in terms of aerodynamic diameter, which refers to an equivalent diameter of a unit density spherical particle with the same terminal settling velocity as the particle being measured [28,29].

Particle Sizes of Aerosols Produced by Nine Indoor Perfumes and Deodorants. Jean-François Bertholon 1, 2, 6, Marie-Hélène Becquemin 1, 3, Monique Roy 1, Francis Roy 4, David Ledur 5, Isabella Annesi-Maesano 2, 6, Bertrand Dautzenberg 2, 7.

1 Aerosols Particle Sizing and Lung Deposition Laboratory, Pulmonary Function Department, Paris, France. 2 Epidemiology of Allergic. Particle size is a notion introduced for comparing dimensions of solid particles (flecks), liquid particles (), or gaseous particles ().The notion of particle size applies to colloidal particles, particles in ecology, particles present in granular material (whether airborne or not), and particles that form a granular material (see also grain size).

PM 10 is defined by ISO as particles which pass through a size-selective inlet with a 50% efficiency cut-off at 10 μm aerodynamic diameter and PM as particles which pass through a size-selective inlet with a 50% efficiency cut-off at μm aerodynamic diameter.

Aerodynamic diameter, d. ae, of sperical and non-spherical particles; d. e = eqivalent volume diameter, ρ. p = particle density, χ = dynamic shape factor.

For the computations, spherical. Aerodynamic analysis of SARS-CoV-2 RNA in two hospitals in Wuhan indicates that SARS-CoV-2 may have the potential to be transmitted through aerosols, although the infectivity of the virus RNA was.

Aerodynamic diameter. The diameter of a sphere of density kg/m3with the same settling velocityas the particle of interest The aerodynamic diameter standardizes for: Shape: Sphere Density. ¾The density of a water droplet ¾ kg/m3 = 1 g/cm3 = 1 g/ml.

Useful aerosol concept used in many Size: KB. Some studies have been conducted on the motion of cylindrical particles in two-phase flows [3][4] [5]. Yin et al. [5] have studied the motion of a single PVC cylindrical particle in stagnant water. Multiple charge inversion is an essential procedure to convert the raw mobility distributions recorded by mobility particle size spectrometers, such as the DMPS or SMPS (Differential or Scanning Mobility Particle Sizers) into true particle number size distributions.

In this work, we present a new multiple charge inversion algorithm with extended by: 3. The size of each drug particle within that droplet is then randomly selected based on the lognormal size distribution of the micronized drug.

Thereafter, the aerodynamic diameter of the residual particle is calculated as a factor of the number, volume, and density of drug particles Cited by: This book studies the dynamics of 2D objects moving through turbulent fluids.

It examines the decay of turbulence over extended time scales, and compares the dynamics of non-spherical particles moving through still and turbulent fluids. The book begins with an introduction to the project, its aims, and its relevance for industrial applications.