Showing papers in "Journal of Aerosol Science in 1997"

TL;DR: In this article, the scaling laws of the spray current and droplet size were obtained from a theoretical model of the charge transport, and the separation between two different behaviours strongly related to the viscosity and electrical conductivity of the liquid was found.

TL;DR: In this paper, the shape of the liquid cone and jet, the electric fields in and outside the cone, and the surface charge density at the liquid surface were calculated and compared to the droplet size scaling laws.

TL;DR: Initial tests with nebulised Bacillus subtilis var.

TL;DR: In this article, the authors present a simple, unified theory of deposition that is applicable for particles of any size, and reproduces very closely experimentally measured variation in deposition velocity with particle relaxation time.

TL;DR: In this paper, the applicability of different theories ranging from exact models to analytical solutions for binary droplet growth or evaporation is discussed. And it can be stated that for slow condensation, simple linearized approaches yield satisfactory approximations, however, for rapid condensation and strong coupling of fluxes, only exact nonlinear expressions accounting for coupled mass and heat fluxes are applicable.

TL;DR: In this paper, the morphology and optical properties of soot produced by combustion, in the laboratory, of petrol, diesel, fuel oil, paraffin, butane and wood in still air were measured.

TL;DR: In this article, the authors focused on inertia effects among drops moving within a turbulent cloud on size distribution evolution and formation of rain and showed that these turbulence-induced mechanisms lead to a broadening of the droplet spectrum during the early stages of cloud formation.

TL;DR: In this article, a new approach to the kinetics of the rearrangement of aerosol agglomerates is presented, based on the change in free energy per primary particle during restructuring.

TL;DR: In this article, a new type of dilution system designed for submicron aerosols with high and medium particle concentrations is presented, which can be selected continuously in the range between 1:10 and 1:104.

TL;DR: In this paper, an experimental study of the effect of particle size, charge, and composition on the loading of an electrically active material is reported, and the results show that in their clean state these filters have superior efficiencies to conventional fibrous filters of similar structure.

TL;DR: In this paper, a system for measuring nm-sized aerosol particles under low pressure conditions using a differential mobility analyzer (low pressure DMA, LPDMA) with a Faraday cup electrometer (FCE) as the detector is developed.

TL;DR: Mould growth in buildings is a major health issue, but most investigations of the indoor air spora still employ culture-based methods, and in at least some groups mycotoxin/secondary metabolite/volatile profiles may be used in identification.

TL;DR: In this article, the authors developed and evaluated ambient fine particle concentrators for conducting animal and human exposure studies, which utilized the technology of virtual impactors to concentrate particles in the range 0.15 -2.5 μm.

TL;DR: In this article, the light absorption coefficient determined by the integrating plate method was always higher than the value obtained by the reference method, and this deviation was explained by considering the transmission, scattering and absorption of light in the slab of deposited particles.

TL;DR: In this article, a variable supersaturation condensation nucleus counter was used to determine the critical supersaturation of ultrafine carbon particles in the Aitken range (particle diameter between 20 and 100 nm).

TL;DR: In this article, light scattering measurements of the aggregation rate for an aerosol of fractal aggregates in a rare field gas were presented, and it was established that aggregation was the dominant growth mechanism.

TL;DR: In this article, the hydrodynamic moment of surface forces is analyzed and a condition for particle detachment from a smooth surface is obtained. But it is not shown that a single asperity contact is equivalent to the contact of a particle with a rough surface.

TL;DR: In this paper, the authors examined the evaporation loss of submicron, monodisperse ammonium nitrate particles during filter sampling when the upstream saturation ratio is zero.

TL;DR: In this article, the size distributions of ammonium and sulfate ions measured in this work were compared with those determined about 30 years ago: a decrease in the absolute concentration and an increase in the mass median diameter of both ions have been observed.

TL;DR: The Journal of Aerosol Science will draw together current knowledge on these subjects and describe the state-of-the-art research, providing a platform for future exploration.

TL;DR: Grosjean et al. as discussed by the authors used light-scattering techniques to measure the droplet size as a function of time for electrodynamically levitated single microdroplets under conditions of controlled humidity and temperature.

TL;DR: In this article, passive deposition samplers, bait plants, and volametric sampler (suction and rotating-arm) are described and their advantages and disadvantages are discussed.

TL;DR: A theory of heterogeneous water nucleation on aerosol particles consisting of soluble and insoluble substances has been developed in this article, which links interfacial free energies of the surfaces, size of an insoluble core and chemical characteristics of the soluble substances with the ability of the aerosols to form water droplets.

TL;DR: In this article, the size distribution of the metal particles, recorded at various sampling positions in the flame, is found to be but little affected by the flame and the sampling procedure, and the distribution of carbonaceous soot particles from an unseeded flame at a fixed sampling position is not shifted upon seeding but coexists next to the peak from the metallic flame additive.

TL;DR: In this paper, a simple model that relates the particle hygroscopic growth factor to the amount of soluble matter bound in the particulate phase, to matter that is exchangeable with the gas phase, and to material that reduces particle water absorption was proposed.

TL;DR: In this paper, a numerical model was developed to predict the performance of differential mobility analyzers (DMAs) for nanometer aerosol measurements, which consists of three parts: flow field, electric field, and aerosol transport formulations.

TL;DR: In this article, the authors present a method for simultaneous measurement of particle size and charge, which is compatible with a chosen method for the latter, but the method is without complications or practical problems, and the need for further work on the subject is apparent.

TL;DR: In this paper, an experimental study of charging and neutralization of 2.5-10 nm aerosol particles by bipolar air ions has been carried out, and the experimental charging probabilities at equilibrium are in relatively good agreement with calculations based on Fuchs' theory, except in the particle size range below 3 nm where large deviations have been observed.