Further analysis of dendritic growth data for succinonitrile

Data reported by Glicksman, Schaefer and Ayers¹ on dendritic growth kinetics in undercooled succinotrile have been reanalyzed using the Trivedi model of dendritic growth, after relaxation of the arbitrary requirement that the dendrite grows with a tip radius, ρ max, that gives the maximum velocity, V_max The experimental results, for both tip radius and growth velocity, fit the Trivedi model with a tip radius some 2 to 4 times greater than ρ_max. The tip radius adopted by a dendrite growing in liquid at a given undercooling, appears to correspond to the radius which gives relative instability of a sphere growing in liquid with the same undercooling. The experimental results also give qualitative support to the model recently proposed by Cantor and Vogel for the influence of fluid flow on dendritic growth.