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Showing papers in "Advanced Powder Technology in 1995"


Journal ArticleDOI
TL;DR: In this article, a vibrating capillary tube whose diameter is varied from 0.58 to 1.26 mm was used to discharge micron or sub-micron particles, such that a thin layer of particles near the inner wall acts as a lubricant through micro-vibrations.

83 citations


Journal ArticleDOI
TL;DR: In this article, impact charging experiments were systematically conducted using four kinds of polymers for impacting particles and three metal targets with different work functions in all of their combinations, and the equilibrium charges were independent of the work function of the metal target and were almost constant for each polymer.

45 citations


Journal ArticleDOI
TL;DR: In this article, an extensive experimental program was carried out on group B and D powders, in L-valves of diameter between 20 and 40 mm, where the particle size influences both solids' flux and pressure drop across the Lvalve.

37 citations


Journal ArticleDOI
TL;DR: In this paper, the motion of particles discharging from a rectangular hopper has been numerically simulated by the distinct element method (DEM) whose time steps are Δt = 10−6, 10−5 and 10−4s, which correspond to stiffness kn = 7.0 × 107.

36 citations


Journal ArticleDOI
TL;DR: In this paper, the rapid expansion of supercritical solution (RESS) is described for the production of fine powders of caffeine from supercritical carbon dioxide upon expansion, and the variation of the density distribution and the particle sizes along a plate of deposition is discussed.

30 citations


Journal ArticleDOI
TL;DR: In this article, a new differential mobility analyzer and an IR ray furnace at a concentration higher than 10 3 cm −3 were introduced into stainless steel wire screens and circular aluminum tubes to investigate particle rebound on solid surfaces.

24 citations


Journal ArticleDOI
TL;DR: In this paper, an estimation method of the optimum refractive index was established by simple data arrangement and the accuracy of the results was improved, which is the weakest point of the laser diffraction and scattering method.

18 citations


Journal ArticleDOI
TL;DR: In this paper, the relationship between the flowability of ground powders and particle shape was investigated, and the effect of the particle shape on the surface roughness of particles was studied.

17 citations


Journal ArticleDOI
TL;DR: The relationship between the packing fraction of the powder layer and the apparent dielectric constant was also well represented by Maxwell's equation as mentioned in this paper, and it was found that the measuring time is drastically reduced by thinning the powder layers.

12 citations


Journal ArticleDOI
TL;DR: In this paper, a method to coat nanometer-sized aerosol particles with thin films of organic materials is presented, which consists of continuous mixing of the aerosol with heated air saturated with organic vapor.

11 citations


Journal ArticleDOI
TL;DR: In this article, the power spectral density function obtained by fast Fourier transform analysis of power consumption had two patterns of peaks and the effects of the operational variables on the frequency of these peaks and on behavior of the peaks at every moment of granulation were investigated.

Journal ArticleDOI
TL;DR: In this article, the ultrafine grinding rate using balls as the grinding media is analyzed as the product of the following items: the number of contact points between balls, the hitting frequency, the volume of nipped particles, the stress applied by hitting balls and the grinding probability.

Journal ArticleDOI
TL;DR: In this paper, a newly defined dispersion efficiency was introduced in order to represent the dispersion state of aerosol particles, independently of the sort of tested powders, and the adhesive characteristic value representing the interparticle adhesive force was obtained through a particle re-entrainment test developed in our laboratory.

Journal ArticleDOI
TL;DR: A novel moisture control system based on the adaptive fuzzy control in agitation fluidized bed granulation that could adjust to the change in the process characteristics without updating the fuzzy rules was described.

Journal ArticleDOI
TL;DR: In this article, the velocity profile of a tracer particle in a moving bed was directly measured by means of a Bore Scope connected with a video system, and the particle velocity distribution was satisfactorily expressed by a mathematical model in polar coordinates.

Journal ArticleDOI
TL;DR: In this paper, a thin film of silica was formed on the alumina particles after being coated in the solution with stearic acid and stearylamine, respectively.

Journal ArticleDOI
TL;DR: In this paper, the influence of wall properties on the morphological change of fine particles induced by impact against a wall was investigated using antimony trioxide (Sb2O3) fine particles and four kinds of impaction plates (copper, borosilicate glass, polyacetal resin and polyurethane resin).

Journal ArticleDOI
TL;DR: In this paper, the formation mechanism of the microcapsules was proposed on the basis of stabilizing effect of SiC particles on coalescence between water-in-oil droplets.

Journal ArticleDOI
TL;DR: In this paper, a simple method is proposed to obtain the distribution of Voronoi cell areas from the measurement of variation in local particle concentrations by a probe of adjustable size, which can provide precise data concerning particle dispersion, but it has the demerit of being time consuming.


Journal ArticleDOI
TL;DR: In this article, a fundamental equation for the friction factor of an additional pressure drop due to solid particles is derived based on the observed flow pattern of solid particles reported in part 1 on a fully developed flow at low fluid velocities in horizontal pipes.

Journal ArticleDOI
TL;DR: In this article, the formation process of a compositional gradient mixture was studied to provide fundamental ideas for manufacturing functionally gradient materials, in which chloride reduced metallic particles were infiltrated within a ceramic packing.

Journal ArticleDOI
TL;DR: In this paper, the mean value of the Voronoi polygons and its variance was defined for the evaluation of the particle arrangements and the distribution of the cluster size can be utilized for detailed evaluation of particle arrangements.

Journal ArticleDOI
TL;DR: In this article, the formation and stability of the ordered structure LS5 composed of large and small monodispersed spherical particles L and S, respectively, in aqueous solutions are investigated, the Brownian motion of particles with the interparticle potential being simulated by the Monte Carlo method.

Journal ArticleDOI
TL;DR: In this paper, the effect of aeration on the thermal stability of a self-heating powder bed is discussed and a restorable limit of the temperature distribution for a given aerated powder bed was proposed.

Journal ArticleDOI
TL;DR: In this paper, a wash-grinding method for high-purity alumina was proposed and the properties of laboratory products had good agreement with those of commercial products and it was confirmed that the purification process was technically feasible.

Journal ArticleDOI
TL;DR: In this article, a new apparatus for the simultaneous processing of mechanical stirring and calcining of superconductive powder materials to achieve a simpler process for the fabrication of super-conductive oxides was presented.

Journal ArticleDOI
TL;DR: In this paper, a submicron powder of either alumina or zirconia was separated by electrophoresis and a mixed suspension of these powders was prepared at a powder concentration of 150-200 p.p.