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Sidebranching induced by external noise in solutal dendritic growth

R. González-Cinca* and L. Ramírez-Piscina

J. Casademunt and A. Hernández-Machado

  • Departament de Física Aplicada, Universitat Politècnica de Catalunya, Campus Nord UPC, Mòdul B5, E-08034 Barcelona, Spain

  • Departament ECM, Facultat de Física, Universitat de Barcelona, Diagonal 647, E-08028 Barcelona, Spain

  • *Author to whom correspondence should be addressed. Email address: ricard@fa.upc.es
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Phys. Rev. E 63, 051602 – Published 16 April, 2001

DOI: https://doi.org/10.1103/PhysRevE.63.051602

Abstract

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 nonconserved 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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Phys. Rev. E 63, 051602– Published 16 April, 2001
  • Received 22 September 2000

© 2001 American Physical Society

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