Modeling of Waves in the Iguasu Gas Centrifuge

Abstract2D axisymmetric transient flow induced by a pulsed braking force in the Iguasu gas centrifuge was simulated numerically. The computational domain consists of three cameras: top, working and bottom. The feed flow injected to the working camera, product and waste fluxes removed in the bottom and top cameras, respectively.The transient case is compared with the stationary case where the flow is excited by the stationery braking force. The braking forces averaged over the period of the rotation are equal each other in both cases. In the transient case the gas flux through the gap in the bottom baffle 15% exceeds the flux in the stationary case for the same pressure and temperature. We argued that the waves reduce the pressure in the GC on the same 15%

Numerical Simulation of the Percolation Cluster of Carbon Nanotubes in Membranes

AbstractThe results of Monte-Carlo simulations of the percolation clusters of carbon nanotubes in the two-dimensional finite thickness membranes are presented. Simulations are performed by the Hoshen-Kopelman and modified Newman-Ziff algorithms. The dependence of the particles critical concentration (percolation thresholds) on the membrane aspect ratio are calculated. The critical concentration decreases with increase of the membrane aspect ratio

Stable Distributions and Rare Events Statistics in Analysis of the Carbon Fibers Strength and Determination of the Critical Stages of Conversion

AbstractStatistics and correlation analysis method based on stable distributions is presented. Method can be applied to the estimation of the influence of one data set to another with respect to the rare events. In carbon fibers data analysis method allows one to estimate influence of the different defect types on the carbon fiber strength and the influence of the mechanical properties of the carbon fiber on the early stages of conversion on the mechanical properties on the latter stages