Showing papers in "Advanced Powder Technology in 1999"

TL;DR: In this paper, a condensed but still rigorous introduction to the concepts of percolation theory to facilitate a broader application in powder technology is presented. But it is not yet reached as broad an application in the field of powder technology as it should deserve.

TL;DR: In this paper, the statistical error caused by sample size (i.e., number of sample particles) has been studied by use of a computer simulation and the results were compared with the theoretical equation in which a log-normal size distribution was assumed.

TL;DR: In this paper, the influence of fluidizing gas velocity, atomizing air, and liquid flow rates, liquid concentration, initial bed mass, and particle size on the mechanism of growth of sand particles in a batch fluidized-bed coater was investigated.

TL;DR: In this paper, the most commonly used formulas for describing the collision rate over the entire particle size regime are presented in a general form Numerical modeling techniques used to describe the changes of the size distribution due to the coagulation process are described and discussed Available analytical solutions are summarized Available analytical solution is summarized

TL;DR: In this article, spherical barium titanate fine powders with a narrow particle size distribution were prepared by ultrasonic spray pyrolysis and as-prepared powders were crystallized to a perovskite structure.

TL;DR: In this paper, the authors investigated the effect of the size distribution on the relation between the coordination number and the void fraction and found that the number of contact points on a particle surface in a randomly packed bed does not change with the size of the particle bed.

TL;DR: Magnesium silicon nitride (MgSiN 2 ) powder was prepared by carbothermally reducing a magnesium metasilicate whose chemical composition corresponded to MgO SiO 2 or MgSiO 3.

TL;DR: In this article, the accumulation process of captured particles on the surface of a rigid filter element is experimentally studied by measuring the pressure drop, which is then related to the packing density of the dust layer.

TL;DR: In this paper, an approximate equation for the particle number concentration was proposed expressing the measured median diameter and the highest voltage measured by the detector, which is applicable to particles having various shapes, i.e. spherical, cubical and prismoidal with a log-normal distribution.

TL;DR: In this article, the effect of material hardness on the breakage process of a circular fluid energy mill was analyzed by estimating breakage parameters using the G-H solution for the size discretized batch grinding equation, with corrections to account for the deviation from first-order kinetics during the initial stages of grinding and a back-calculation scheme.

TL;DR: In this paper, glass beads were coated in a vibro-fluidized bed by atomizing a fine silica powder and polyvinyl alcohol solution, and the coating efficiency and weight fraction of the agglomerated particles were measured under various experimental conditions, and their dependencies on the amplitude and frequency of vibration were investigated.

TL;DR: In this paper, the effectiveness of calcium stearate, boric acid, and silica as additives for the fine grinding of calcite in media milling was explored, by following the size distribution of the ground product collected at various time intervals from 15 s of grinding up to 30 min, using a single size feed.

TL;DR: An electrically conducting powder was produced by mixing bronze spheres with a small amount of carbon black powder, and the potential difference across beds of this powder was measured under static conditions and vibration.

TL;DR: In this article, an analysis of previously unpublished data for the flow of cohesionless granular material in inclined open channels was performed and three regimes of mass flow behavior, supercritical and two regimes of subcritical flow, were observed and are characterized by their dependence on chute inclination and geometry.

TL;DR: In this article, the authors investigated the fundamental characteristics of particle movement under laser radiation pressure from the viewpoint of particle separation by using a simple geometrical optics model and the simulation of particle motion in a laser beam.

TL;DR: In this paper, the wettability and surface structure of precipitated silica surface loaded trimethylsilyl groups were investigated and it was found that the non-treated sample had micropores.

TL;DR: In this article, the effects of operational conditions on the total quantity of deposited AIN inside the agglomerates inside the moving bed of a moving-bed reactor were investigated.

TL;DR: In this paper, the authors investigated the segregation phenomena of a binary mixture in a vertical vibrated bed by using image technology and measured the maximum segregation ratios at different vibration acceleration amplitudes.

TL;DR: In this article, a two-dimensional simulation has been conducted in an electrostatic powder-coating booth for controlling particle deposition, where coulombic forces (coulombic and image forces) are added in the motion of the particle, the trajectories change significantly near the target.

TL;DR: Sintered CeO2-ZrO2 (1:9 molar ratio) targets were subject to CO2 laser ablation (1600 W for 8 s in air) regarding alloying and phase transformation of the fluorite type condensates for potential engineering applications as mentioned in this paper.

TL;DR: In this paper, the flow characteristics of a coal-oil-water mixture (COW) were investigated and the relative viscosity of COW was well-correlated by an equation derived from Mooney's equation.

TL;DR: In this article, a computer model which allows us to describe the statistical packing of spherical particles is created, based on which the maximum value of a number of pair contacts corresponded to the coordination numbers 3 and 8-10.

TL;DR: In this article, a disk centrifuge-type pneumatic classifier was developed, with a classifier nozzle introduced at a specific location inside the classifier so that the suction created out of the expansion of air through this nozzle can be used for the on-line control of the product fineness.

TL;DR: In this paper, the effect of particle properties on the morphological change of particles induced by impaction against a solid surface has been investigated using tristearin powders mixed with large and hard particles.

TL;DR: In this paper, the structure of composite granules was characterized by comparing the size of a composite granule with that of SiC agglomerates in the granule, and it was found that composite structures of the granules could be classified into six kinds of structural models.

TL;DR: In this article, the streamline method is applied to simulate solids flow in a blast furnace by superposing potential sources at the lower parts of the furnace model onto a viscous down-flow stream.

TL;DR: In this article, the authors investigated experimentally the flow patterns of sand movement and the corresponding foam pattern drift in a vibrating flask, and found that foam patterns drift is affected by the vibration conditions, the geometry of the foam pattern, the locations at which foam pattern is embedded and the modulus of elasticity of the flask.