Dendrite tip-shape characteristics
Book
·
OSTI ID:479259
- Rensselaer Polytechnic Inst., Troy, NY (United States). Materials Science and Engineering Dept.
The assumption that dendrite tips are parabolic bodies of revolution pervades many of the theories and experiments addressing dendritic growth. This assumption, while reasonable, is known to become less valid as regions of interest further form the tip of the dendrite are considered. Experimental measurements were made on pure succinonitrile dendrites at several supercoolings. The equation that describes the dendrite tip profile is extended from a second order polynomial (paraboloidal) form to one that includes higher-order terms. The deviation of a dendrite tip from a parabolic body of revolution can be characterized by a parameter obtained from the coefficient of the fourth-order term describing the profile. This dimensionless parameter, Q, is found to be a function of the profile orientation only, independent of supercooling.
- Sponsoring Organization:
- National Aeronautics and Space Administration, Washington, DC (United States)
- OSTI ID:
- 479259
- Report Number(s):
- CONF-951155--; ISBN 1-55899-301-0
- Country of Publication:
- United States
- Language:
- English
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