[en] A nozzle for adiabatically expanding a gas mixture in separating uranium isotopes and/or compounds of uranium isotopes is claimed. The slot-shaped nozzle is defined by two nozzle walls. These are symmetrically disposed on either side of a plane of symmetry passing through the nozzle. Insulation means which reduces heat transfer from the nozzle to a gas mixture passing through the nozzle is disposed adjacent sides of the nozzle walls remote from the nozzle

[en] The separating nozzle is designed so that the profile bars and the pipe body are tensioned by a leaf spring. The spring has a rolled edge which engages in a groove of the profile rods. This measure ensures that interference with gas flow in the area of the peeling shutters and nozzle lips is considerably reduced. This construction makes it easy to replace individual profile bars. Other modifications ensure that an even pressure is produced over the whole length of the profile bars. (PW)

No abstract available

No abstract available

[en] The analysis presented is based on two methods of numerically determining flow parameters: finite-difference solution of the governing fluid dynamic equations, and Monte Carlo simulation. A set of fluid equations for ternary flow with disparate mass were derived from the kinetic equation assuming a 95 percent, 5 percent mixture of light molecules to heavy molecules. The finite-difference solution of these equations initially was obtained for a simple two-dimensional channel separator. A direct simulation method also was applied to the channel. Results of the two methods are presented. The extension of the direct simulation method to separation devices of practical size required the tracing of sample particle trajectories. The flow predicted by the sample particle method is compared with direct simulation results. Results obtained for systems of practical size and Knudsen number are presented for parametric variations of geometry and flow conditions

[en] X-ray lithography using synchrotron radiation has been applied in a multi-step process for the production of plastic moulds to be used in the fabrication of separation nozzles by electrodeposition. For characteristic dimensions of a few microns a total height of the nozzle structure of about 400 μm has been achieved. Structural details of about 0.1 μm are being reproduced across the total thickness of the polymer layer. The surface finish of metallic separation nozzles produced by electrodeposition was equivalent to the high quality of the polymer surface. The separation-nozzle systems fabricated by the described method allow an increase by a factor three of the gas pressure in separation-nozzle plants as compared to the present standard. This results in considerable savings in the enrichment of ₂₃₅U for nuclear power production. (orig.)

[en] A method for producing a component of a separation element for separating a gaseous mixture into fractions is claimed. The element is composed of separating nozzle structures presenting passages defining mixture supply channels, separating chambers and fraction discharge channels. A negative mold of the component is formed by providing a plate of an electrically non-conductive material, whose ability to be removed from the plate is influenced by application of selected radiation. Portions of the plate are irradiated in a pattern corresponding to the passage presented by the nozzle structure to an extent such that material outside of the regions delimiting the passages is removable more easily than material within those regions. The plate of the electrically non-conductive material is mounted on a substrate of an electrically conductive material either before or after irradiation. Material is removed from the plate to create the negative mold of the component. The openings are electrochemically filled with a metal to create a sold plate-shaped member and the negative mold is removed

[en] The described procedure for the separation of gaseous and vaporous materials, particularly isotopes, with different molar weight and for different gasdynamic cross section operates with nozzles which are passed by the gas or gas mixture as an expanding jet. The jet is separated into fractional jets by means of a skimmer blade edge which is placed in its flow route. A following deflection makes the separation of the fractional jet possible. Additional expansion renders post-acceleration possible. The partial jets which are lead away outwards are combined in a cascade if their material composition is equivalent. The skimmer blade edge itself is constructed as a deflection wall with respect to the surface which is turned towards the fractional jet. The particular advantages of the process and the separation nozzle device are the enhanced separation factor together with the reduced operational costs. (RB)

[en] The separation nozzles used for the enrichment of gaseous isotopes, above all UF₆, consist of foil packets, which are pressed together by cover plates. These packets are supported in separation pipes. The invention deals with an improved design of the cover plates and the holding pipe, which makes possible a cheaper production and an improvement of the plant compactness. Drawings and a detailed description explain the patent application. (UWI)

[en] The present invention relates to an improved apparatus for the separation of a fluid mixture, particularly an isotope mixture, into fractions by difference in mass. Apparatus for the separation nozzle method is described. The advantages of the system derive from the fact that the separating elements can be formed as a one-piece unit for each station or at most from two plates for each station, with especially high precision by electrodeposition techniques. They can be emplaced in the seats machined with equally high precision in the cast passage-forming body so that all of the tolerances can be preestablished in the separating element or by the precision of the machining of the fitting surfaces