Effects of G-jitter on directional solidification of a binary alloy



Publisher: National Aeronautics and Space Administration, Glenn Research Center, Publisher: National Technical Information Service, distributor in [Cleveland, Ohio], [Springfield, Va

Written in English
Published: Downloads: 774
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Subjects:

  • Binary alloys.,
  • Gravitation.,
  • Solidification.,
  • Enthalpy.,
  • Solid phases.,
  • Temperature distribution.,
  • Latent heat.,
  • Directional solidification (Crystals),
  • Vibration.

Edition Notes

StatementC. Benjapiyaporn ... [et al.].
SeriesNASA/TM -- 1999-209281., NASA technical memorandum -- 209281.
ContributionsBenjapiyaporn, C., NASA Glenn Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15557198M

Effects of G-jitter on directional solidification of a binary alloy Download PDF EPUB FB2

Get this from a library. Effects of G-jitter on directional solidification of a binary alloy. [C Benjapiyaporn; NASA Glenn Research Center.;].

Studies on g-jitter effects indicate that convection in microgravity is related to the magnitude and frequency of g-jitter and to the alignment of the gravity field with respect to the growth. This article describes a numerical study of g-jitter driven double-diffusive convective flows and thermal and concentration distributions in binary alloy melt systems subject to an external.

During directional solidification of a binary alloy at constant velocity, thermosolutal convection may occur due to the temperature and solute gradients associated with the solidification process.

For vertical growth in an ideal furnace (lacking horizontal gradients) a quiescent state is by: Benjapiyaporn C; Timchenko V; De Vahl Davis G; Leonardi E; De Groh HC,'Effects of G-jitter on directional solidification of a binary alloy', in NASA (ed.), 49th international astronautical congress, 49th international astronautical congress, Melbourne, pp.

1 - 10, presented at 49th international astronautical congress, Melbourne, The application of a low-gravity environment is generally accepted for investigations of convection affected processes. A variety of existing and planned means of access to low gravity is offered to investigators.

Some of the main results of the past concerning metal solidification are Cited by: 3. () investigated the role of thermal diffusion phenomena on compositional variation in a binary mixture of methane and n-butane in the presence of g-jitter.

They found that the presence of g-jitter causes mixing and overcomes the Soret effect in a cavity, therefore making it difficult to measure the Soret coefficient accurately in space.

Hurle D T J, Jakerman E, Wheeler A A. Hydrodynamic stability of the melt during solidification of a binary alloy.

Physics of Fluids26(3), – [45] Wheeler A A, MsFadden G B, Murray T B, Coriell S R. Convective stability in the Rayleigh-Bénard and directional.

‘A numerical study of the effects of fluid properties on natural convection’ awarded inone of his main passions has been natural convection and therefore the focus of this lecture will be on what Eddie Leonardi has achieved in numerical and experimental investigations of laminar natural convective by: 4.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF.

Visit to get more information about this book, to buy it in print, or to download it as a free PDF. Full text of "Microgravity Science and Applications. Program Tasks and Bibliography for FY " See other formats. Coriell S.R., Boisvert R.F., Rehm R.G., Sekerca R.F., “Lateral solute segragation during unidirectional solidification of a binary alloy with a curved solid-liquid interface”, J.

of Crystal Growth 54 (), CrossRef Google ScholarCited by: Full text of "NASA Technical Reports Server (NTRS) Microgravity Materials Science Conference Volume 3" See other formats.

Full text of "NASA Technical Reports Server (NTRS) Microgravity Materials Science Conference" See other formats. Such a directional solidification process is present in many industrial processes such as directional freezing of cast turbine blades, welding of alloys and Bridgman growth of electronic materials.

By changing growth conditions, it is possible to solidify a given alloy with a planar, cellular or dendritic interface of a single phase, or a.

The Quench Furnace with X-Ray is also available for ground-based low gravity research at NASA Lewis Research Center. This three zone, end chill directional solidification furnace with a water quench can reach a maximum temperature of C.

It was developed to study the solidification of metal samples during low gravity testing in research. Publishing platform for digital magazines, interactive publications and online catalogs.

Convert documents to beautiful publications and share them worldwide. Title: Topical Teams in Life & Physical Sciences (SP), Author: European Space Agency, Length: pages, Published: GUIA DE ARTICULOS TECNICOS.

µ ˆ 2 = −2µ 4 cos4 θˆ + sin4 θˆ − 3µ 6 cos6 θˆ + sin6 θˆ. Directional Solidification with “Small” Anisotropy A quite general formulation for the effects of both anisotropy and departures from thermodynamic equilibrium has been given by Coriell and Sekerka () in which the solidification model discussed earlier was.

British Library Cataloguing-in-PublicationData A catalogue record for this book is available from the British Library. MATERIALS PROCESSING IN MAGNETIC FIELDS Proceedings of the International Workshop copyright 0 by World Scientific Publishing Co.

Ltd. All righis reserved. NASA Microgravity Materials Science Conference. NASA Technical Reports Server (NTRS) Szofran, Frank R. (Compiler); McCauley, D.

(Compiler); Walker, C. (Compiler) The M. MEPHISTO-4 was a directional solidification experiment that studied the liquid-to-solid transformation of bismuth alloyed with tin. Directional solidification is a freezing technique common to the processing of the electronic materials used in integrated circuits and detectors, such as silicon and germanium.

Ouyang () Multilevel Simulation and Modeling of Vertical Bridgman Growth of Single Crystals and Solidification of Binary Alloys 9. Rao () Computational Modeling of Phase Change, Convective Heat Transfer and Free Surface Flow in Solidification Processing assure a point of quality control of the database entries across data entry categories that include a.

topic domain code b. author c. title of article or book d. journal title e. publication date f. volume and issue information g. page or chapter location h. abstract when available and not copyrighted i.

if evaluated results of the evaluation. Solidification was studied in a binary NH4Cl-H20 system [JM], the mushy region of binary liquid metal melts [97JM] and in binary mixtures with active Soret effect [JM].

Prediction of solute trapping at high solidification rates in binary alloys [89JM] and the shape of eutectic grains in a solidifying alloy [JM] were also studied.5/5(1).

Lyubimova Т.Р., Parshakova Ya.N. Vibration effect on morphological instability of crystal/melt interface in the directional solidification of binary al- * loys. АРМ XXXVI АРМ. Book of Abstracts. Saint-Petersburg. P The effects of injection strategy and fuel split were investigated.

Some of the first results are promising, but more experiments are required to capture the true spray-wall (i.e.

piston) effects. metallic alloy liquids processed in a containerless environment are the focus of quasi s investigations in both the thermolab and icoprosol team. the primary goals of the flight investigations are (1) investigation of the roles of stirring and diffusion in the nucleation step of liquid crystallization and subsequent growth (2) measurements of.