Sidebranching induced by external noise in solutal dendritic growth

Details Sidebranching induced by external noise in solutal dendritic growth Sidebranching induced by external noise in solutal dendritic growth

2001-01-23

arxiv.org/abs/nlin/0101043v1

Nonlinear Sciences

Pattern Formation and Solitons

13 pages, 5 figures

Scientific paper

10.1103/PhysRevE.63.051602

We have studied sidebranching induced by fluctuations in dendritic growth. The amplitude of sidebranching induced by internal (equilibrium) concentration fluctuations in the case of solidification with solutal diffusion is computed. This amplitude turns out to be significantly smaller than values reported in previous experiments.The effects of other possible sources of fluctuations (of an external origin)are examined by introducing non-conserved noise in a phase-field model. This reproduces the characteristics of sidebranching found in experiments. Results also show that sidebranching induced by external noise is qualitatively similar to that of internal noise, and it is only distinguished by its amplitude.

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