Experimental Research of Influence of a Relative Particles Positioning in a Gas Stream on Characteristics of their Aerodynamic Traces

The cycle of experimental studies on determination of length of aerodynamic traces of the particles which are flowed round by an air stream is executed. When carrying out researches, panoramic optical methods for diagnostics of multiphase flows of PIV and PTV were used. Velocities of an air flow were varied in the range of 1-3 m/s. The sizes of particles changed from 1mm to 5 mm. The defining influence of the sizes of particles and velocities of an air stream on length of aerodynamic traces is established. Influence of a relative positioning of particles on features of formation of an aerodynamic trace is shown

The Preparation and Characterization of β

Two kinds of β-SiAlON nanostructure whiskers, rod-like and wool-like whiskers, were synthesized by pressure-less sintering method at 1773 K for 5 hours. The whiskers synthesized were characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and high-resolution electron microscope (HREM) techniques. It was found that diameter distribution of rod-like whiskers was about 80–250 nm, while it was about 45–55 nm in diameter for the wool-like whiskers. The growth mechanisms of β-SiAlON nanostructure whiskers are discussed by the vapor-solid (VS) and vapor-liquid-solid (VLS) mechanisms, respectively

Molten slag density measurements with focus on slag structures

Density of molten slags is probably the most important and fundamental thermophysical property playing significant roles in high temperature fluid mechanics and dynamics. In this work, the density of low silica CaO-SiO2-Al2O3 slags with a silica content of 5 - 14 % was measured using Archimedes Principle. This method has advantage over the other methods for the fact that the oxygen potential can be maintained easily in comparison to the maximum bubble pressure technique and experimental errors can be reduced compared to the sessile drop technique

Phase Equilibria, Oxygen Potentials, and Activities in the System Ni-Co-Si-O at 1373 K

In the system Ni-Co-Si-O, the compositions of coexisting phases participating in two-phase equilibria between the monoxide $(Ni_yCo_{1-y}O)$ and orthosilicate $(Ni_zCo_{1-z}Si_{0.5}O_2)$ crystalline solutions, and alloy $(Ni_xCo_{1-x})$ and orthosilicate phase, have been determined at 1373 K. The samples were equilibrated at 1373 K under argon gas, and the equilibrium compositions of the phases present after quenching were measured by electron probe microanalysis (EPMA). A solid-state cell incorporating yttria-stabilized zirconia as the solid electrolyte was used to measure the oxygen chemical potential corresponding to the three-phase equilibrium between the alloy, orthosilicate solution, and quartz as a function of alloy composition. From these measurements, activity-composition relationships in the alloy and orthosilicate solid solutions have been derived using a new method. Activities in the silicate solution have also been obtained independently using the mixing properties of the rock-salt solid solution available in the literature and the tie-line information obtained in this study. Both methods yield almost identical results. All three solid solution series-alloy, monoxide, and orthosilicate-exhibit mild positive derivations from ideality. The excess Gibbs free energy of mixing of the orthosilicate solid solution $(Ni_zCo_{1-z}Si_{0.5}O_2)$ at 1373 K can be represented by the relation $\Delta GE=(2110 \pm 30)^.z(1-z) J^. mol^{-1}

Thermal conductivity of Al-Salt composites

QC 20120912</p

Evaluating the chemical diffusion coefficient of sulfur in slag by metal analysis

Godkänd; 2012; 20120608 (andbra

Evaluating the chemical diffusion coefficient of sulfur in slag by metal analysis

Godkänd; 2012; 20120608 (andbra

Concepts and measurement of velocities and viscosities at the slag-metal Interface

Godkänd; 2012; 20120608 (andbra