Studies of Partially Solidified Systems

部分凝固系统的研究

• 批准号: 8805349
• 负责人: David Loper
• 金额: $ 6.75万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-01-01 至 1990-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8805349&HistoricalAwards=false
• 关键词: Studies; Partially; Solidified; Systems

Partially molten systems, in which a change of phase between liquid and solid can occur, arise in a wide variety of settings, such as in the solidification of magma chambers and the Earth's core and in the casting of metallic alloys. These multi-phase systems are often physically complex and exhibit anomalous behavior not seen in single phase systems. The study of such systems has bee hampered by the lack of a set of governing equations derived from first principles. This research will be a systematic attempt to derive such equations and to elucidate some of their unusual properties. Also the characteristics of the mushy zone which forms as an aqueous solution of ammonium chloride is cooled from below will be studied experimentally to determine whether the theory can successfully predict the occurrence and characteristics of the chimneys or channels which from spontaneously.

在各种环境中，例如在岩浆室和地核的凝固过程中以及在金属合金的铸造过程中，都会出现部分熔融系统，在这种系统中，液体和固体之间可能会发生相变。这些多相系统通常是物理上复杂的，并且表现出在单相系统中看不到的异常行为。由于缺乏一套由第一原理导出的控制方程，对这类系统的研究一直受到阻碍。这项研究将是一次系统的尝试，试图推导出这样的方程，并阐明它们的一些不寻常的性质。此外，还将对氯化铵水溶液从下冷却时形成的糊状区的特性进行实验研究，以确定该理论是否能成功地预测自发形成的烟囱或通道的发生和特征。