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首页> 外文期刊>Journal of Crystal Growth >Crossover from diffusion-limited to kinetics-limited growth of ice crystals
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Crossover from diffusion-limited to kinetics-limited growth of ice crystals

机译：从扩散限制到动力学限制的冰晶生长交叉

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Experimental study of the free growth of an ice crystal into a supercooled pure water film is presented. We have performed the measurements of main parameters of growing dendrite such as the tip velocity v_t, the main distance z_(SB) between the tip and the position of the first sidebranch, and the fractal dimension d_f of the whole dendrite as functions of initial supercooling of water. The experimental results, i.e. v_t, z_(SB), and d_f, have been compared with analytical studies [J.S. Langer, H. Mueller-Krumbhaar, Acta Metall. 26 (1978) 1681; E. Brener, D. Temkin, Phys. Rev. E 51 (1995) 351], and numerical simulations [J. Nitmann, H.E. Stanley, J. Phys. A 20 (1987) L981]. It is found that at high supercooling there is an essential disagreement between present results and predictions of diffusional models of dendritic growth. We show that the disagreement between experiment and theory is due to crossover from diffusion-limited to kinetics-limited growth of ice crystal. The anisotropic growth kinetics of ice crystals is discussed.
机译：提出了将冰晶自由生长为过冷的纯水膜的实验研究。我们已经进行了生长枝晶的主要参数的测量，例如尖端速度v_t，尖端与第一侧枝位置之间的主要距离z_（SB）以及整个枝晶的分形维数d_f作为初始过冷的函数水。实验结果，即v_t，z_（SB）和d_f，已与分析研究进行了比较[J.S. Langer，H。Mueller-Krumbhaar，金属学报。 26（1978）1681; E. Brener，D。Temkin，物理学。 E 51（1995）351]和数值模拟[J.尼特曼（Nitmann）斯坦利，《物理学报》 A 20（1987）L981]。发现在高过冷度时，当前结果与树突生长扩散模型的预测之间存在本质上的分歧。我们表明，实验与理论之间的分歧是由于从冰晶的扩散受限到动力学受限的生长交叉。讨论了冰晶的各向异性生长动力学。

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