Relaxation Process of Nuclei on Rapid Solidification

快速凝固时核的弛豫过程

• 批准号: 03650552
• 负责人: ISHIHARA Keiichi
• 金额: $ 1.34万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650552/
• 关键词: supersaturated solution; nucleation; relaxation; bubble of beer; 缶ビ-ル; 潜在核

In this research, how long the homogeneous nuclei can survive was investigated. The nuclei was produced in the supersaturated solution of CO_2 in water, the vessel was opened after vivration from super sonic source. This situation was made by using cannded beer and cola. The term of vivration and relaxation time was measured. Once the vivration was given, the relaxation speed of decay of bubble was higher than that of original sample. After 1 hour from vivration, when the can beer was opened, no bubble formed. This result can be explained by using the criteria of Pshechnikov et al. This criteria is that there is sub critical nuclei whose diameter is smaller than critical one, and exist stavly.

在本研究中，研究了均匀核的存活时间。核是在CO_2的过饱和水溶液中产生的，用超音速源振动后打开容器。这种情况是使用罐装啤酒和可乐造成的。测量了振动项和弛豫时间。当振动给定时，气泡衰减的弛豫速度高于原始样品。振动1小时后，打开罐装啤酒，无气泡形成。这一结果可以用Pshechnikov等人的标准来解释。该准则是存在亚临界核，其直径小于临界核，且稳定存在。