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L. I. Dvorkin V. L. Shestakov V. G. Ganchikov V. N. Marchuk 《Power Technology and Engineering (formerly Hydrotechnical Construction)》1988,22(11):652-655
1. | For a porosity of about 5% the quality indices of APC are at the level of the requirements of the existing specifications P20-85:K F0.85,R 20>3 MPa,R 50>1.2 MPa,K th>2.5–3. |
2. | The experiments on the impermeability of APC showed that material with a porosity of 4–5% withstands a water pressure of 0.2–0.3 MPa without its infiltration through the specimens. |
3. | The results obtained give grounds to revise the traditional requirements imposed on the residual porosity — not more than 3% — of APC-base structural members. Compaction of asphaltic and asphaltic polymer-impregnated concrete mixes to a residual porosity of 4–5% will make it possible to reduce expenditures on compaction. In this case, variants of compacting mixes to various residual porosities are possible in combination with surface treatment of the material with sealing compositions (for example, with a bitumen-polymer binder) which must be substantiated by technical and economic calculations for the particular conditions of conducting works on constructing watertight facings of hydraulic structures. |
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New developments in forging and pressing technology at PAO Ruspolimet are considered. New methods of producing shells, disks, plates, and shafts are presented. 相似文献
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The results of activity made in the framework of preparation of the experiment SAFIR (Single fin condensAtion: FIlm local measuRements) of European Space Agency are presented. First prototype of the test cell has been developed and tested. Confocal technique has been adopted for condensate film thickness measurements. Experiments on condensation of the liquid FC-72 have been carried out. Average heat transfer coefficient has been measured in the range of 880–1440 W/m2 K and compared to the Nusselt theory. 相似文献
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Experimental Study of Laminar Convective Condensation of Pure Vapor Inside an Inclined Circular Tube
Yuriy Lyulin Igor Marchuk Sergey Chikov Oleg Kabov 《Microgravity science and technology》2011,23(4):439-445
Convective condensation of pure ethanol vapor inside a smooth tube of inner diameter 4.8 mm and of length 200 mm is studied.
The experiments have been carried out at temperature 58°C corresponding to the pressure of 440 mbar, the vapor mass velocity
varying from 0.24 to 2.04 kg/(m2 s). The dependency of the Heat Transfer Coefficient (HTC) is investigated experimentally both subject to the temperature
difference between the saturated vapor and the wall and subject to the condenser inclination. The results show that the HTC
reduces with growth of the temperature difference. The dependency of the HTC on inclination has a maximum in the range 15°–35°
due to the complex gravity drainage mechanism of the condensed liquid. The results could be useful for development of compact
effective cooling systems for space and ground application. 相似文献
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Some aspects of the ESA space program EMERALD are presented. A problem of the film type condensation on curvilinear fin is considered with taking into account the essential influence of the capillary forces and non uniform temperature of the fin. Disjoining pressure effect on condensate film flow is studied numerically, because of very thin film of condensate on the fin tip. Value of the groove flooding depth changes significantly the condensate outflow from the condenser. Calculations for water condensation predict a very high value of the heat transfer coefficient, more than 50 kW/m2K, on a quite important part of the surface area and confirm the idea of proposed condenser and Double Capillary Pumped Loop. 相似文献
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A. N. Marchuk 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2008,42(4):216-219
It is suggested that attention be focused on geodynamic loads on dams.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 6, June 2008, pp. 52–56. 相似文献