THE DEVELOPMENT OF SPATIAL CORRELATIONS DURING OSTWALD RIPENING: A TEST OF THEORY
THE DEVELOPMENT OF SPATIAL CORRELATIONS DURING OSTWALD RIPENING: A TEST OF THEORY
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DOI：
10.1016/s1359-6454(00)00036-7
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发表时间：
2000-06
期刊：
影响因子：
9.4
通讯作者：
V. Snyder;J. Alkemper;P. Voorhees
中科院分区：
文献类型：
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作者：
V. Snyder;J. Alkemper;P. Voorhees
在微重力条件下研究了 Pb-Sn 液体中固体锡颗粒的粗化。在经历奥斯特瓦尔德熟化的低体积分数系统的平面截面上测量空间相关函数。相关函数随时间的变化表明微观结构最初由颗粒簇组成，后来演变为更加分散的颗粒结构。 Akaiwa 和 Voorhees (AV) 的模型用于研究空间相关性对成熟过程的影响。我们发现最初高度相关的结构对粒度分布的演变没有明显的影响，但确实对系统的粗化率有影响。具体来说，我们确定由粒子簇组成的结构比具有随机、空间排列的非重叠粒子的系统粗化得更快。我们还发现，使用空间相关性而不是使用粒度分布可以更灵敏地监测微观结构接近稳态的情况。实验测量的空间相关性和粒度分布与使用初始实验相关性和粒度分布通过 AV 模拟计算的结果非常吻合。
The coarsening of solid-Sn particles in a Pb–Sn liquid was studied under microgravity conditions. Spatial correlation functions were measured on plane sections in a low-volume fraction system undergoing Ostwald ripening. The correlation functions changed with time in a way that indicated that the microstructure initially consisted of clusters of particles and evolved into one which was more dispersed. The model by Akaiwa and Voorhees (AV) was used to study the effect of spatial correlations on the ripening process. We found that the initially highly correlated structure had no observable effect on the evolution of particle size distributions, but did have an effect on the coarsening rate of the system. Specifically, we determined that a structure consisting of clusters of particles coarsened faster than a system with a random, spatial arrangement of non-overlapping particles. We also found that the approach of the microstructure towards the steady-state regime could be monitored more sensitively using spatial correlations rather than using particle size distributions. The spacial correlations and the particle size distributions measured from the experiment agreed well with those calculated from the AV simulations using the initial experimental correlations and size distribution.