Showing papers in "Journal of Aerosol Science in 1993"

TL;DR: In this article, a sublayer model for deposition of spherical particles from turbulent air streams in vertical ducts with smooth and rough walls is described and the predicted deposition rates under various conditions are compared with the available experimental data and a reasonable agreement is observed.

TL;DR: In this paper, a two-dimensional particle size distribution model is used to describe gas phase synthesis of titania and silica powders, and the effects of residence time, temperature and particle material properties on powder morphology are investigated.

TL;DR: In this article, local inhomogeneities of particle deposition are examined in a bifurcation geometry under realistic expiratory flow conditions, considering the simultaneous effects of inertial impaction, gravitational settling, Brownian motion and interception.

TL;DR: In this paper, a two-dimensional numerical model was developed to predict temperature and velocity distributions, heating and evaporation of the injected iron powder, nucleation and growth of iron particles, and particle transport by convection, diffusion and thermophoresis.

TL;DR: In this paper, a novel experimental technique was developed and used for measuring the deposition velocities of nonspherical particles from turbulent air flow in a horizontal pipe, and the authors found that the deposition velocity of particles, characterized by intermediate values of the effective relaxation time, is significantly affected by the non-pherical particle's shape via the interception mechanism.

TL;DR: In this paper, a mathematical model of nucleation and particle growth during the partial expansion of a dilute supercritical solution in a sub-sonic converging nozzle is presented and solved numerically.

TL;DR: The effects of reaction temperature, carrier gas type, solution concentration, and aerosol droplet size on the characteristics of the resultant silver particles were examined in this paper, where solid, spherical, micron-sized silver metal particles were produced by spray pyrolysis from a silver nitrate solution.

TL;DR: In this paper, a modified collision kernel for power law (fractal-like) particles is proposed for the free molecule regime, and the collision kernel is solved using self-preserving size distribution theory for fractal dimensions between 2 and 3.

TL;DR: In this article, the authors compared the ternary nucleation rates of methane sulphonic acid (CH 3 SO 3, MSA)-sulphuric acid (H 2 SO 4 )-water vapour particles from the gas phase at 298.15K were calculated and compared to binary nucleation rate, using simplified classical nucleation theory.

TL;DR: In this article, an experimental set-up was designed, constructed, and used to study the wall deposition rate of particles in a turbulent channel flow, and the particle concentration at the test section was measured with the aid of an isokinetic probe.

TL;DR: In this article, the effects of reduced ambient pressure and particle shape on the API Aerosizer instrument responses have been investigated, and the results showed that the aerosizer overestimated the sizes of particles at an ambient pressure of 625 mm Hg (83.3 kPa) by as much as 25%.

TL;DR: In this article, the use of particle inertia to bring particles seeded in a viscous, incompressible jet to a sharp focus is considered, where the diameter d of the particle deposits collected on a greased impaction plate placed normally to the aerosol jet is measured as a function of the distance L between the nozzle and the collector.

TL;DR: In this article, a semi-empirical model of the penetration of a filter based on foam media has been proposed, which has been tested against available experimental data and demonstrated to be a useful predictor of penetration characteristics for plugs of foam media suitable for use as pre-selectors in personal samplers for the thoracic and respirable aerosol fractions.

TL;DR: In this paper, the evaporation of sodium chloride aqueous solution droplets in diffusion dryers and hot-wall reactors was investigated theoretically using a model that describes the evolution of the droplet size, solvent vapor concentration in the carrier gas, and both droplet and gas temperatures along the reactor axis.

TL;DR: In this article, the photophoretic force and the particle velocity are calculated for the whole range of Knudsen numbers taking into account the particle's thermophysical, optical and accommodation properties.

TL;DR: In this paper, a numerical Monte Carlo algorithm has been developed and applied for the calculation of the ionic charging rate of small aerosol particles in the intermediate Knudsen regime.

TL;DR: In this paper, it was shown that an information parameter κ close to 1 is necessary for a meaningful inversion of the optical data, and this applies to the particle size range between 3 and 2 μm in diameter.

TL;DR: In this paper, a new model has been developed for right-angle impaction that considers secondary elastic deformation in the plastically deformed layer, and the ratio of total adhesive energy of impact kinetic energy was found to depend on particle size and target material which results in the dependence of rebound velocity on the same parameters.

TL;DR: In this article, a new class of oxides with three-dimensional nanoscale structures, called nanostructured oxides, was studied and reviewed, which were assembled from clusters of 5-15 nm, produced through vaporization by Joule heating or magnetron sputtering in an inert atmosphere.

TL;DR: In this article, the authors used multiple linear regression to relate liquid viscosity (μ), density (ρ), surface tension (σ), flow rate (Q), airstream velocity (U) and rotation rate (N) to the droplet size spectra parameters.

TL;DR: In this article, the authors present a summary of the limitations of sampling inlets currently used for airborne applications and a set of recommendations to overcome these limitations and improve the general quality of such measurements.

TL;DR: In this article, a review of the range of specific aerosol effects arising when a strong laser beam interacts with aerosol particles is presented. But this review is limited to the case of strong laser beams.

TL;DR: Physically-based models for aspiration efficiency at these orientations have the potential to provide useful insight into the performances of practical sampling devices and can provide valuable guidelines for the development of more rigorous approaches to blunt sampler theory.

TL;DR: In this article, the formation of PoOx molecular cluster aerosols from the decay of radon, and sulfuric acid nanometer nuclei and ultrafine aerosols were studied through wire screen-based size distribution measurements of the 218Po radioactivity associated with the aerosols.

TL;DR: The spectral extinction coefficient and the volume scattering function both of a laboratory generated aerosol and atmospheric aerosol have been measured for a wavelength range between 400 and 700 nm and the mass size distribution (for aerodynamic diameter) of the aerosols was determined simultaneously using a low pressure impactor as mentioned in this paper.

TL;DR: In this paper, the authors extended Taylor's electrostatic theory for electrified liquid cones to take into account liquid and charge emissions in the form of a capillary microjet, and analyzed the droplet size, its charge, and the emmited current as functions of the liquid properties.

TL;DR: In this paper, a systematic theoretical and experimental investigation of the effects of the particle size, velocity and number concentration on the correlation function as well as the effect of aperture angle of the observation optics is presented.