Read e-book online Materials Processing in High Gravity PDF

By Liya L. Regel, William R. Wilcox

ISBN-10: 1461360730

ISBN-13: 9781461360735

ISBN-10: 1461525209

ISBN-13: 9781461525202

There are factors for learning fabrics processing in centrifuges. First, such learn improves our figuring out of the impression of acceleration and convection on fabrics processing. moment, there are advertisement possibilities for construction of particular and more desirable fabrics that can't be ready lower than basic earth stipulations or in house. via a mix of experiments and concept, we're gaining an knowing of centrifugation on phenomena of significance to fabrics processing. we discover that it is crucial to contemplate not just acceleration, but in addition the Corio lis impact and the difference of acceleration with place. As one outcome, the vigour of buoyancy-driven convection is usually elevated by way of centrifugation and infrequently diminished. equally, the tendency of the convection to develop into volatile or oscillatory could both be elevated or reduced via centrifugation. however, the saw results of centrifugation on product caliber have mostly long past unexplained. This quantity constitutes the lawsuits of the second one overseas Workshop on fabrics Processing at excessive Gravity, hosted by means of Clarkson college in June of 1993. the concept that for a workshop on fabrics processing in centrifuges was once born at a chain of casual conferences held in Paris in 1990. the 1st overseas Workshop on fabrics Processing at excessive Gravity was once held in might of 1991 in Dubna, USSR, at the banks of the Volga River. The complaints of this workshop was once released in 1992 as a distinct factor of the magazine of Crystal Growth.

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M. Lifshitz. "Hydrodynamics," Nauka, Moscow (1986). I. Universite Paris-Sud BP 133 91403 Orsay Cedex, France ABSTRACT Convective instabilities generated in liquid cells, under earth's gravity, for a destabilizing thermal gradient, can be removed by centrifugation. Experiments on molten tin show a reversible transition from an unstable to a stable regime, at a well defined value of the rotation rate. These observations can be understood by considering that the axial buoyancy force depends on both the density gradient and the acceleration generated along the axis of a fluid cell installed on a centrifuge.

6). 1 g. --.. 3 .......... 2 ao u 0; ~ -2 ~ -3 os -4 L-~ o __L-J-~~~~~~~UL~~WU~~~ 50 150 200 100 Ti me (minutes) 250 300 Figure 5. Radial temperature gradient measured inside destabilizing tin melt, height 80 mm and diameter 27 mm. Change of rotation speed occurs at vertical dashed lines, with the values between representing the resultant acceleration in g. a o - 1 ....... u ..... , ~ . ;:; -4 -< o o -5 CI o L -____~_ _L-~__~JL~~~_ _~_L~_ _~ o 50 100 150 200 Time (mi nutes) 250 300 Figure 6. Axial temperature gradient measured inside destabilizing tin melt, height 70 mm and diameter 17 mm.

A. Arnold, NASA GSRP (1992). 12. R. Bird. W. Stewart and E. Lightfoot. , New York: 45 and 98 (1960). 34 CONVECTIVE FLOWS DURING CRYSTAL GROWTH IN A CENTRIFUGE Vadim A. F. Ioffe Institute of Physics and Technology 194201 St. Petersburg, Russia ABSTRACT Convective phenomena in the melt strongly influence crystal growth in a centrifuge. Large scale convective flows are induced, because hydrostatic equilibrium cannot be established in the melt, if the temperature gradient is not parallel to the "total" (gravitational plus centrifugal) acceleration.

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Materials Processing in High Gravity by Liya L. Regel, William R. Wilcox


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