Dendritic sidebranching with periodic localized perturbations: Directional solidification of pivalic acid--coumarin 152 mixtures

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics; (United States)

DOI:https://doi.org/10.1103/PhysRevE.48.489· OSTI ID:6392342

Williams, L M; Muschol, M; Qian, X; Losert, W; Cummins, H Z ^[1]

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1. Department of Physics, City College of New York, City University of New York, New York, New York 10031 (United States)

We have studied the response of the sidebranches of pivalic acid dendrites, growing by directional solidification, to localized periodic thermal perturbations. The perturbations were generated by a laser beam focused near the tip of a single dendrite growing in a glass capillary, with the pulse duration, repetition rate, and intensity controlled separately. The perturbation dramatically altered the sidebranch structure, producing ordered sidebranches of well-defined wavelength, synchronous with the perturbation, which were strongly correlated on the two sides of the dendrite. The dependencies of the sidebranch amplitude on the frequency of the perturbation and on the distance from the dendrite tip were compared to the predictions of Barber, Barbieri, and Langer [Phys. Rev. A 36, 3340 (1987)] and found to be in qualitative agreement. The value of the selection parameter [sigma] found from these fits to the theory is compared to a value obtained from material parameters also determined in this experiment, and to a value deduced from the initial Mullins-Sekerka instability of the planar crystal-melt interface.

• DOE Contract Number: FG02-84ER45132
• OSTI ID: 6392342
• Journal Information: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics; (United States), Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics; (United States) Vol. 48:1; ISSN PLEEE8; ISSN 1063-651X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
CARBOXYLIC ACIDS
COUMARIN
CRYSTAL GROWTH
CRYSTAL STRUCTURE
CRYSTALS
DENDRITES
DISPERSIONS
DISTURBANCES
ESTERS
HETEROCYCLIC COMPOUNDS
LACTONES
LASERS
MICROSTRUCTURE
MIXTURES
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PIVALIC ACID
PYRANS
SOLIDIFICATION
SOLUTES
SOLUTIONS