Shape evolution of a melting nonspherical particle.
Shape evolution of a melting nonspherical particle.
复制标题
熔融非球形颗粒的形状演变。
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
C. Tropea
中科院分区：
文献类型：
--
作者：
Daniel Kintea;T. Hauk;I. Roisman;C. Tropea
在这项研究中，不规则冰晶的融化被观察到在一个声学悬浮。利用高速视频系统捕捉粒子形状的演变过程。发现了几个典型现象：颗粒形状的变化，熔化液体在颗粒表面出现毛细流动，导致液体在颗粒中部（界面曲率最小的地方）聚集，以及颗粒尖端出现尖锐的尖头。在球形颗粒熔化过程中，不可能观察到这种现象。建立了一个近似的理论模型来解释与不规则粒子熔化有关的主要物理现象。理论预测的熔解时间、粒子形状演变与实验数据吻合较好。
In this study melting of irregular ice crystals was observed in an acoustic levitator. The evolution of the particle shape is captured using a high-speed video system. Several typical phenomena have been discovered: change of the particle shape, appearance of a capillary flow of the melted liquid on the particle surface leading to liquid collection at the particle midsection (where the interface curvature is smallest), and appearance of sharp cusps at the particle tips. No such phenomena can be observed during melting of spherical particles. An approximate theoretical model is developed which accounts for the main physical phenomena associated with melting of an irregular particle. The agreement between the theoretical predictions for the melting time, for the evolution of the particle shape, and the corresponding experimental data is rather good.