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Investigations are conducted on counterflow interaction between flows in gas-liquid film apparatus with different reflux densities of water and gases (argon, air, carbon dioxide, helium), which have different densities and viscosities.

Reduction in concentration of mechanical impurities is evaluated in the circulating flow of cleaned water, some of which has been passed through a hydrocyclone. A procedure for calculating the extent to which the solid phase is extracted into a slime-receiving bin is proposed for development of the hydrocyclone plant.

Investigations of the influence of the geometrical parameters of the flow path on the integral power characteristics of a free-vortex pump are conducted by means of numerical CFD methods. Recommendations for selecting the width of the profile of the impeller blade and the number of blades are given. The cavitation features of the designed vane systems are investigated.

Breakdown of air tightness due to a variation in load is possible in detachable airtight joints as the temperature of their constituent elements varies. Methods of assuring the constancy of the load independently of any variation in temperature for the flange connection and a stuffing box seal with soft stuffing and calculations of the parameters necessary to achieve this objective are presented.

Two alternative designs of a hermetically sealed extractor, the drive of which utilizes a cylindrical magnetic clutch, are examined. In the first version, the driving half coupling is internal, and the driven half coupling external. In the second version, the driving half coupling is external, and the driven internal. It is shown that as the extractor based on the first design begins to accelerate with use of a frequency regulator that permits smooth variation in current frequency, the maximum angle of mismatch between the half couplings of the magnetic clutch is less then 0.5π rad. The proposed design of the extractor has been tested at an establishment manufacturing radiochemical products, and placed in experimental-industrial service. Extraction is one of the basic critical production processes at chemical and radiochemical establishments. Centrifugal extractors allow for significant improvement in mass-exchange characteristics of the process, acceleration and optimization of the process, and compact layout of the extraction equipment. The extractor is distinguished by a short contact time between the working solution and organic extractant. Until recently, use of this equipment in radiochemical-production processes had been suppressed due to the destructive effect of radioactive radiation on the seals, lubrication, and electric motor. The building of a centrifugal extractor with high mass-exchange characteristics, which ensures serviceability under these conditions, is therefore critical. Centrifugal extractors in which an asynchronous motor is employed as the drive, and the support assemblies for the rotor of which are built on journal bearings formed from silicide graphite, have been developed for solution of this problem. Airtightness of the extractor is provided by a magnetic clutch that transfers rotational movement from the driven half coupling via a dividing partition (shield), which hermetically separates the effective chamber of the extractor from the surrounding medium [1]. Two versions of the cylindrical magnetic clutch are possible:

A method, which acounts for particle acceleration in the radial direction and the effect of the Coriolis force, is presented for the analysis of centrifuges.

In high-temperature reactors fabricated from alloy steels with an austenitic facing, contact pressure develops when the wall of the cylindrical shell is heated above 200°C in the zone where the built-up layer abuts the base metal due to the difference in their coefficients of linear expansion. A procedure is proposed for analysis of the contact pressure and evaluation of the cyclic strength of the housing and facing with consideration of the internal pressure and pressure within the zone of contact. As an example, results are presented for an R-201 reactor in a plant used for hydrotreating fuels. Calculations indicated that the allowable number of cycles for the facing is an order lower than that for the housing of the reactor.

The viewpoint of one of the developers of the collection of national standards GOST R 52857.1–2007 – GOST R 52857.12–2007 “Vessels and Apparatuses. Norms and Methods of Strength Calculation” on the problems of support for standards over their life cycle is elucidated and recommendations are offered on the definition of some basic terms used in the normative documents.

The periodic method for the production of suspension polymethylmethacrylate of injection molded grades has a number of significant drawbacks: it does not ensure the stability of the properties of the finished product in various batches, it involves significant manual labor. The designs of reactors for carrying out the process in a continuous mode are proposed. These designs allow ensuring the stability of the properties of the finished product, excluding the granulation operation in the manufacture of polymethylmethacrylate products. A mathematical model of the structure of flows in the reactor using the mathematical apparatus of stationary processes and Markov chains has been developed. The proposed reactor can be used by factories of the chemical industry for the polymerization of methyl methacrylate and its copolymers, as well as, possibly, for the polymerization of other monomers that form similar reaction systems.