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Статьи (Англ.)

Numerical and Experimental Investigation of Crystal Growth Rate Dependence on Facet Undercooling for Dielectric Crystal Growth from the Melt
art_3.pdf (1.01 MB)

S. V. Bykova, V. D. Golyshev, M. A. Gonik, V. B. Tsvetovsky, V. I. Deshko, A. Ya. Karvatskii, A. V. Lenkin

J. of Heat Transfer Engineering. — 2006. — Vol. 27, Number 2/March. — P. 43—57.

Abstract

Combined experimental and numerical tools are developed and used to define more exactly the growth kinetic relations for (211) crystallographic orientation of Bi4Ge3O12 (BGO) crystal growth—namely, the dependence of crystal growth rate V on supercooling, ∆T of the melt/crystal interface. A new apparatus for in situ measurements of the time dependence of the supercooling, ∆T(t), was used, and a new, two-dimensional numerical model was applied to analyze the effect of temperature boundary conditions and faceting phenomena on the character of the observed V(∆T) dependence. The measurements of the ∆T(t) dependence show that there is a large enough undercooling and a novel effect of the appearance of the local maximum on ∆T(t) dependence at the finish of crystallization. Results on V(∆T) dependence show that, for the variant of the crystal growth technique used (melt cooling during axial heating process method [AHP]), the type of the V(∆T) dependence does not depend on boundary conditions. The new investigations illustrate the superlinear behavior for V(∆T) dependence for (211) BGO crystallographic orientation and show that previous data on sublinear behavior of V(∆T) dependence for this crystallographic orientation of BGO have not been justified.

The complex heat exchange model at growing of large alkali halide crystals
fm174-14.pdf (423.71 kB)

A.V.Kolesnikov, V.I.Deshko, Yu.V.Lokhmanets, A.Ya.Karvatskii, I.K.Kirichenko

Primary scientific and technical problems at the increase of power efficiency of aluminium cells
art_10.pdf (687.66 kB)

E.N. Panov, A. Ya. Karvatskii, S. V. Leleka

Abstract

Increase of energy cost is highly significant for energy-intensive industrial branches, in particular, for competitiveness of aluminium producers. Therefore, the development and construction of electrolysis cells with decreased specific power consumption and increased lifetime of cathode assembly are of vital importance. Nowadays numerous projects are under intensive development devoted to the electrolysis cells of this type with consideration of preliminary MHD estimations, power and mechanical properties supported with subsequent engineering projects. However, rather frequently the anticipated results do not match actual consequences. One of the major reasons is a set of uncertainties at every stage of development. This is relevant both for methods of modeling of electrolysis cell state, and for influence of changes in technological schedule and properties of involved raw materials on technological process, and for changes of properties of raw materials depending on supplier and manufacturing process, external factors and so on. This report discusses only some of the challenges we met at solution of actual problems, however, we believe, that the discussed scope of the challenges prevents the achievement of reliable approaches and requires for conductance of supplemental investigations. It should be noted, that the development of «successful» design of electrolysis cell results in significantly higher cost savings than the investments into the conductance of such supplemental investigations.

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  • United Сompany RUSAL
    United Сompany RUSAL
  • Братский алюминиевый завод (РУСАЛ Братск)
    Братский алюминиевый завод (РУСАЛ Братск)
  • Волгоградский алюминиевый завод (ВгАЗ)
    Волгоградский алюминиевый завод (ВгАЗ)
  • Запорожский производственный алюминиевый комбинат (ЗАлК)
    Запорожский производственный алюминиевый комбинат (ЗАлК)
  • Иркутский алюминиевый завод (ИркАЗ)
    Иркутский алюминиевый завод (ИркАЗ)
  • Кандалакшский алюминиевый завод (КАЗ)
    Кандалакшский алюминиевый завод (КАЗ)
  • Красноярский алюминиевый завод (РУСАЛ Красноярск)
    Красноярский алюминиевый завод (РУСАЛ Красноярск)
  • Саяногорский алюминиевый завод (РУСАЛ Саяногорск)
    Саяногорский алюминиевый завод (РУСАЛ Саяногорск)
  • Хакасский алюминиевый завод (ХАЗ)
    Хакасский алюминиевый завод (ХАЗ)
  • Инженерно-технологический центр РУСАЛ
    Инженерно-технологический центр РУСАЛ
  • Всероссийский алюминиево-магниевый институт (РУСАЛ ВАМИ)
    Всероссийский алюминиево-магниевый институт (РУСАЛ ВАМИ)
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