Direct measurement of mechanical properties of metal to be used in manufacture of power plant equipment

The mechanical properties of some steels, which have been measured according to the techniques developed by specialists of the Donbassenergo Department of Metals and Welding and UralVTI, are compared with the results of direct tensile tests. A conclusion has been drawn on the advisability of performing direct measurements of the mechanical properties of metal.     

Air permeability of calendered needle-punch materials

The proposed method of heat treatment of materials with a bicomponent fibre increases their air permeability. The permeability of needle-punch materials is a function of their resistance to compression by the air stream. In describing air flow in needle-punch and treated materials, use of the pore volume per unit of mass and area of the sample as the structural parameter is optimum. Translated from Khimicheskie Volokna, No. 1, pp. 37-39, January-February, 2009.     

Peculiarities of boiling in subcooled flow

Peculiarities of heat transfer during boiling in high-velocity flow subcooled relative to the saturation temperature are analyzed. Flow structure is analyzed. Boiling in swirled flow and boiling in flow heated on one side are considered.     

Evaluation of the air permeability of needle-punch materials

Darcy’s approach has limited application for assessing the air permeability of needle-punch materials due to the complex dependence of the air-permeability coefficient on the thickness of the materials. The air-permeability coefficient is determined by the pore volume of the materials. Air transfer varies for needle-punch materials with a relatively low pore volume due to a change in the packing of the fibres. __________ Translated from Khimicheskie Volokna, No. 3, pp. 31–33, May–June, 2006.     

Air Drag of Needle-Punch Filter Material

The effect of filter material manufacturing technology on its initial air drag is a function of the choice of the criterion used for assessing the structure of the materials to a great degree. When the surface density is used as a structural characteristic, the initial drag of needle-punch cloth and modified materials is described by a common curve. Additional research is necessary for determining the optimum method of thermal modification that would ensure manufacture of materials with adjustable initial drag.     

Mechanism and kinetics of thermal decomposition of uranyl nitrate hexahydrate under the nonisothermal conditions

Thermal decomposition of UO₂(NO₃)₂·6H₂O to U₃O₈ was studied by thermogravimetric (TG), differential thermogravimetric (DTG), and differential thermal (DTA) analyses in combination with gaschromatographic and chemical methods. The process is described by kinetic data recorded under the non-isothermal conditions. UO₂(NO₃)₂·6H₂O transforms into UO₃ in eight main stages in the 40–300°C range, and UO₃ into U₃O₈, in three stages with the peaks of weight loss at 580, 620, and 645°C.     

Mechanical characteristics of nap-raised nonwoven materials

In processing the experimental data, an equation was obtained that can be used for predicting the change in the nap height of materials undergoing heat treatment and with a known bicomponent fibre content under the effect of mechanical loads. The optimum duration of heat treatment of nap-raised materials is 1–2 min and the temperature is 175°C. __________ Translated from Khimicheskie Volokna, No. 1, pp. 43–45, January–February, 2007.     

Investigation of hydraulic drag and heat transfer in a single-phase swirl flow under one-sided heating

The procedure and results are given of an experimental investigation of hydrodynamics and heat transfer in a subcooled swirl flow of water under conditions of one-sided heating of short channels.     

É-100 zirconium — a new constructional material for chemical machinery

Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 1, pp. 28–31, January, 1993.