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Gravitational effects in dendritic growthThe theories of diffusion-controlled dendritic crystallization will be reviewed briefly, along with recently published critical experiments on the kinetics and morphology of dendritic growth in pure substances. The influence of the gravitational body force on dendrite growth kinetics will be shown to be highly dependent on the growth orientation with respect to the gravity vector and on the level of the thermal supercooling. In fact, an abrupt transition occurs at a critical supercooling, above which diffusional transport dominates the growth process and below which convective transport dominates. Our most recent work on binary mixtures shows that dilute solute additions influence the crystallization process indirectly, by altering the interfacial stability, rather than by directly affecting the transport mode. Directions for future studies in this field will also be discussed.
Document ID
19840039559
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Glicksman, M. E.
(Rensselaer Polytechnic Inst. Troy, NY, United States)
Singh, N. B.
(Rensselaer Polytechnic Inst. Troy, NY, United States)
Chopra, M.
(Rensselaer Polytechnic Institute, Troy, NY, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1983
Subject Category
Astronautics (General)
Accession Number
84A22346
Funding Number(s)
CONTRACT_GRANT: NAG3-333
Distribution Limits
Public
Copyright
Other

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