Journal ArticleDOI
Materials Processing in the Reduced-Gravity Environment of Space
J. R. Carruthers,L. R. Testardi +1 more
TLDR
In this paper, the effects of gravitation on the behavior of fluids and the shapes of materials for the years 1977-1982 are reviewed, with a focus on ground-based research which complements and gives direction to experimentation in the reduced-gravity environment of space.Abstract:
Studies of the effects of gravitation on the behavior of fluids and the shapes of materials for the years 1977-1982 are reviewed, with a focus on ground-based research which complements and gives direction to experimentation in the reduced-gravity environment of space. Fluid-behavior topics discussed include crystal growth from melts and from vapor, dendritic solidification and casting, multiphase alloy solidification, electrophoresis, convection behavior, and special heat-flow considerations characteristic of the space environment. With regard to solids, such subjects as containerless positioning technology and its applications (in glass preparation, liquid drop and shell studies, nucleation experiments, and measurements of fundamental properties of molten reactants), liquid floating zones, solid self-deformation, and sedimentation and buoyancy effects are considered and illustrated.read more
Citations
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Journal ArticleDOI
Levitation in Physics
TL;DR: Levitation is used for containerless processing and investigation of materials, for frictionless bearings and high-speed ground transportation, for spectroscopy of single atoms and microparticles, and for demonstrating superconductivity in the new oxide superconductors.
Journal ArticleDOI
Containerless processing in the study of metallic melts and their solidification
TL;DR: The study of metallic melts, their physical properties, and their solidification behavior is of relevance to understanding of fundamental principles and to metallurgical applications as discussed by the authors, and many, if not all, of them have been studied.
Journal ArticleDOI
Bulk formation of a metallic glass: Pd40Ni40P20
TL;DR: In this article, Molten spheroids of up to 0.53 cm minor diameter were slowly cooled (1.4 K/s) on a fused silica surface under 10 to the -6 torr vacuum to a form which was entirely glassy except for some superficial crystallinity comprising less than 0.5% of the volume.
Journal ArticleDOI
Liquid immiscible alloys
Lorenz Ratke,S. Diefenbach +1 more
TL;DR: In this article, the authors describe the extensive progress that has been made during the last decade and also the fundamentals of immiscibles and also show that the combination of classical laboratory research, research under reduced gravity conditions and a newly developed computational modelling technique seems to be just becoming available to solve the problems of decomposition, spatial phase separation and microstructure evolution during cooling of an alloy through the liquid miscibility gap.
Journal ArticleDOI
Oscillations of drops in zero gravity with weak viscous effects
T. S. Lundgren,Nagi N. Mansour +1 more
TL;DR: In this article, the effect of small viscosity is included in the computations by retaining first-order viscous terms in the normal stress boundary condition, which is accomplished by making use of a partial solution of the boundary-layer equations which describe the weak vortical surface layer.
References
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Convective transport and instability phenomena
Jürgen Zierep,Herbert Oertel +1 more
TL;DR: In this article, the authors present concepts of thermal and viscous instabilities in connection with the Rayleigh-Berard convection and discuss the practical applications within reactive systems and materials science.
Rotating Liquid Drops: Plateaus Experiment Revisited
TL;DR: In this paper, the dynamics of liquid drops rotating in another liquid were studied experimentally with an oil drop suspended in a neutral buoyancy tank, and new stable shapes not predicted by the theory were observed.
Hydrodynamic performance of an annular liquid jet: Production of spherical shells
TL;DR: In this paper, the authors describe the fluid dynamic processes by which the shells are formed, and a description of means for preserving and promoting the geometrical of the product, and the forming of metallic shells is mentioned.
Fabrication of glass spheres for laser fusion targets
TL;DR: In this paper, the authors developed processes for mass producing the quality glass microspheres required for current laser fusion experiments, and described the advances in the methods and materials used in their liquid droplet and dried gel systems.