Ice Layer Spreading along a Solid Substrate during Solidification of Supercooled Water: Experiments and Modeling
Ice Layer Spreading along a Solid Substrate during Solidification of Supercooled Water: Experiments and Modeling
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DOI：
10.1021/acs.langmuir.7b00930
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发表时间：
2017-05-16
期刊：
影响因子：
3.9
通讯作者：
Tropea, Cameron
中科院分区：
文献类型：
--
作者：
Schremb, Markus;Campbell, James M.;Tropea, Cameron
实验研究了固壁对固着过冷水滴凝固过程的热影响。从使用高速视频系统捕获的视频确定树枝状凝固之前沿沿着固体基底传播的初始冰层的速度。实验进行了不同的基板材料和液体过冷。在最近的研究中，在适度过冷，在金属基板的情况下，只有一个微弱的影响基板的热性能上的冰层速度观察。利用两相Stefan问题的解析解，建立了冰层速度的半经验模型。实验数据很好地描述了在整个扩散限制凝固制度的所有过冷水平。对于更高的过冷度，该模型高估的冻结速度，由于在固液界面，这是不占模型中的分子附着过程中的动力学效应。本工作的实验结果提供了一个新的视角防冰系统的设计。
The thermal influence of a solid wall on the solidification of a sessile supercooled water drop is experimentally investigated. The velocity of the initial ice layer propagating along the solid substrate prior to dendritic solidification is determined from videos captured using a high-speed video system. Experiments are performed for varying substrate materials and liquid supercooling. In contrast to recent studies at moderate supercooling, in the case of metallic substrates only a weak influence of the substrate's thermal properties on the ice layer velocity is observed. Using the analytical solution of the two-phase Stefan problem, a semiempirical model for the ice layer velocity is developed. The experimental data are well described for all supercooling levels in the entire diffusion limited solidification regime. For higher supercooling, the model overestimates the freezing velocity due to kinetic effects during molecular attachment at the solid liquid interface, which are not accounted for in the model. The experimental findings of the present work offer a new perspective on the design of anti-icing systems.