Showing papers in "Advanced Powder Technology in 1998"

TL;DR: Some preliminary steps and ideas to obtain appropriate design tools based on reliable and significant bulk solids' properties based on similarity to the design of solid machine parts are outlined.

TL;DR: In this paper, the mass flow rate of polymer powder in a gas-solids pipe flow was investigated theoretically and experimentally based on the static electrification of the flowing particles, and two current detecting pipes made of different materials were used and mass flow rates were calculated from the two generated currents.

TL;DR: In this paper, a planetary ball mill was used for dry grinding of chitosan powder for its applications to drug carriers, and the particle size was analyzed by a laser scattering diffraction method.

TL;DR: In this article, the model equations previously developed by Rhodes et al. were tested against experimental data obtained in a 0.1 ID m riser and the predicted axial pressure drop was in agreement with the experimental data provided the entrainment decay constant a is taken equal to approximately 0.4.

TL;DR: In this paper, a modified homogeneous precipitation technique involving enzymatic decomposition of urea was proposed and was applied to the synthesis of alumina precursors, and the resulting aggregates were amorphous with no trace of pseudoboehmite.

TL;DR: In this article, the authors numerically simulated the blockage phenomena in the three-dimensional rectangular hopper using the distinct element method (DEM) in which the effects of cohesion forces between particles were taken into account.

TL;DR: In this article, the effects of air velocity and particle diameter on the thickness and the interval of striped deposition layers were studied as a simultaneous phenomenon of particle deposition and reentrainment in a rectangular channel flow.

TL;DR: In this article, glass beads were coated in a fluidized bed by atomizing a suspension of nylon or silica fine powder and polyvinyl alcohol (PVA) was used as a binder.

TL;DR: In this paper, the influence of pipeline geometry on the performance of pneumatic conveying systems is examined and the contribution of straight pipe and bends to the overall pressure drop is assessed for both dilute and dense phase flows.

TL;DR: In this paper, a three-dimensional modified discrete element method was proposed to simulate the deformation process of two types of large aggregates depositing to a plate in a viscous fluid under various external forces.

TL;DR: In this paper, the development and use of high speed photography and video imaging and image processing and analysis for the measurement of particle velocities and concentrations, and divergent angles of gas jets in fluidized beds are described.

TL;DR: In this paper, the authors described the mixing process of powders in an agitation type of solid mixer based on a modified comminution model and expressed the mixing procedure for the fine and adhesive powders by means of the disintegration process of the tracer agglomerates (ironoxide) in the bulk powder bed (calcium carbonate) in this model.

TL;DR: In this article, the characteristics of the horizontal conveyance of dense phase flow of powder were experimentally investigated using a progressive cavity pump, and the results showed that the pressure drop depends on the dynamic friction coefficient of the powder, i.e. dynamic wall friction coefficient or dynamic internal friction coefficient.

TL;DR: The results suggested the possibility for using Gd-containing lecithin microcapsules in Gd neutron-capture therapy as diffusion-controlled drug-release devices due to poor water uptake and poor swelling.

TL;DR: In this article, a SnO2 multilayered gas sensor was prepared by using electrostatic agglomeration and electrostatic adhesion of aerosol particles, in order to develop a new system which enables simultaneous CH4 and CO sensing.

TL;DR: In this article, a shape separator equipped with a vibrating rotating disk was developed, and its performance was investigated for irregularly shaped particles of 50-300 μm in size under various operating conditions.

TL;DR: In this paper, the molecular dynamics method and IR spectroscopy have been applied to investigate the conformations of several normal alkoxy groups grafted on a silica surface, and the results of the MD simulation are nearly in accordance with those obtained by IR measurements.

TL;DR: In this article, the effect of the disperser's configuration and operating conditions on the generated electrical charge was investigated and the measured particle charge was found to decrease with operating time and reached a constant value after 15 min.

TL;DR: The East Asian Professor's Meeting of Powder Technology (EAPMT) was established in 1995 to contribute to the global development of powder technology by addressing regional problems and information relevant topowder technology from East Asia as mentioned in this paper.

TL;DR: In this paper, the authors simulate the fluid flow in a porous filter in a dust removal facility, gas velocity and pressure distributions in the filter element at T = 673 K and Pc = 20 atm were calculated numerically for both steady and non-steady states.

TL;DR: In this paper, one larger particle rising from the bottom of a vibrated granular bed filled with smaller particles was experimentally measured and the influence of the vibrational amplitude, the vibrous acceleration, and the vibration frequency on the segregation process was analyzed.

TL;DR: In this paper, a generalized Stokes number was proposed to evaluate free-fall velocity of particles in non-Newtonian suspensions of dolomitic limestone, and the results demonstrated that evaluation efficiency is more reliable using this form of the Stokes numbers and that errors may be minimized, even at slurry concentrations as low as 5% in volume.

TL;DR: In this article, a line start sedimentation type sizing technique of aerosol particles using an ultramicroscope has been developed to determine the number density distribution of particle size in a direct manner.

TL;DR: In this article, a simplified mathematical model was developed to estimate the particle flow rate in a spouted bed, based on the mass and momentum conservation laws in the spout region, and on the force balance in the annulus.

TL;DR: In this article, the axial solid concentration profile in the upper dilute region of circulating fluidized beds is analyzed based on the lateral solid transfer model which includes mass transfer of particles between the core and the annulus, analogous to the countercurrent absorption process.

TL;DR: In this paper, a vertical tracer band technique and the Bore-Scope technique have been developed to measure solids flow patterns and velocities in a moving bed, and the measured results show that a semi-three-dimensional (3D) model is useful to obtain the Solids flow pattern as a whole.