Heat transfer and hydraulic resistance in tightly packed corridor bundle of rods

Results are given of an experimental investigation into heat transfer to mercury and to a sodium-potassium alloy and into the temperature field of a tight corridor bundle of rods. The experimental equipment is described and a method is given for performing the experiments. We discuss experimental data on the hydraulic resistances of tight bundles. A comparison is made of heat transfer to molten metals in tight corridor bundles and bundles arranged in a chess-board pattern.The authors would like to thank A. I. Leipunskii for his interest shown in the work and for his valuable comments. S. P. Rogov, S. G. Povsten', N. F. Kozlov, and A. M. Barabanov took part in the work.     

Physical and mathematical simulation of the process of centrifugal dust separation

Results are presented of a calculation and experimental simulation of the process of centrifugal dust separation, and a method for calculating the limiting dimension is developed.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 18, No. 3, pp. 422–426, March, 1970.     

Developments of OAO All-Russian Research and Design Institute of Relay Manufacture with a Pilot Factory of ABS electro in field of high-voltage electric drive and power electronics

The main developments of OAO All-Russian Research and Design Institute of Relay Manufacture with a Pilot Factory in the field of high-voltage electric drives and semiconductor converters designed and fabricated at the institute are considered. The key products are different types of thyristor devices for a soft startup based on thyristor frequency converters and thyristor devices for the automated actuation of a reserve in the power industry.     

Distinctive features of modern high-voltage thyristor devices

This article provides an example of using distributed (decentralized) process control systems designed by All-Russian Research and Design Institute of Relay Manufacture with a Pilot Factory. One of these systems is intended for the soft start of HV electric motors, while the other is intended for the automatic transfer switch. Compared to conventional methods, the use of the new approach has ensured better reliability and lower project costs.     

Influence of intensified electrosmelting on the lining life of the DSP-135 arc furnace at OAO Severskii Trubnyi Zavod

The wear topography of the lining of the DSP-135 arc furnace at OAO Severskii Trubnyi Zavod is analyzed. The difference in effectiveness of magnesia slag-forming agents in converters and electrofurnaces is discussed. Means of extending the lining life in superpowerful arc furnaces are considered.     

Structure and mechanical properties of titanium subjected to high-rate channel angular pressing and deformation by rolling

The macro- and microstructure have been analyzed and the tensile mechanical properties have been measured for commercial titanium subjected to dynamic channel angular pressing (DCAP) at high temperatures using one or two passes, as well as to additional warm rolling and low-temperature annealing. The structure of titanium after DCAP at a high temperature consists of a dispersed mixture of fine recrystallized grains (1 to 2 μm in size) and deformed nonrecrystallized regions. The deformed regions have a subgrain structure with sub-grains 200–300 nm in size. After the second pass, the size of the recrystallized grains becomes less by two times as compared to their size after one-pass DCAP, the subgrains in the deformed regions acquire a more equiaxed shape, and the microstructure becomes more uniform. The warm rolling of the samples subjected to DCAP at high temperatures increases the total density of dislocations and provides a high level of internal stresses. After two-pass DCAP at 530°C, the ultimate strength of titanium was 650MPa and the relative elongation was 19%. Additional rolling to 50% at 300°C and low-temperature annealing increases the ultimate strength to 790 MPa, while the relative elongation is retained at a high level of 15%.