Kinetic dendrite in the boundary-layer model

D. Temkin; J. C. Géminard; P. Oswald

doi:doi:10.1051/jp1:1994147

Numéro		J. Phys. I France Volume 4, Numéro 3, March 1994


Page(s)		403 - 409
DOI		https://doi.org/10.1051/jp1:1994147

DOI: 10.1051/jp1:1994147
J. Phys. I France 4 (1994) 403-409

Kinetic dendrite in the boundary-layer model

D. Temkin, J. C. Géminard and P. Oswald

Ecole Normale Supérieure de Lyon, Laboratoire de Physique, 46 Allée d'Italie, 69364 Lyon Cedex 07, France

(Received 29 September 1993, accepted 3 December 1993)

Abstract
Within the boundary-layer model and by taking into account only interface kinetics (isotropic or anisotropic), we find a continuous set of "kinetic" dendrites. This solution exists at arbitrary supercooling $\Delta$ in the 2D- and 3D-axisymmetric cases and reduces to the usual dendrites with parabolic tails at $\Delta$ < 1, and "angular" dendrites at $\Delta$ > 1. In contrast with classical Ivantsov dendrites, there are upper limits for growth velocity and tip curvature at each supercooling $\Delta$ .