Interactions between steady and oscillatory convection in mushy layers

糊状层中稳定对流和振荡对流之间的相互作用

• 批准号: EP/F036701/1
• 负责人: Michael Worster
• 金额: $ 2.09万
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FF036701%2F1
• 关键词: Interactions; between; steady; oscillatory; convection

One of the challenges in predicting the solidification of multicomponentmaterials such as metallic castings is to describe the evolution of mushy layers: partially solidifiedregions in which solid and liquid phases coexist. Such systems exhibitunusual properties not seen in single-phase systems. One example is thealteration of the crystalline structure by convection of heat and solute making theflow problem nonlinear and leading to the formation of solid-free dissolution channels,or 'chimneys', in the solid matrix. A strikingly complex pattern ofchimney convection has been observed in recent laboratory experiments: a new'breathing mode' of convection has been found, in which chimneys allperiodically appeared and disappeared in phase. This project aims at anunderstanding of the observed behaviour using mathematical techniques. In particular, the nonlinear interactions between steady andstanding-wave oscillatory convection modes will be elucidated, and stableflow regimes and their parametric sensitivity quantified. Further laboratory experiments will also be conducted to provide more detailed information about this newly discovered phenomenon.

预测金属铸件等多组分材料的凝固过程的挑战之一是描述糊状层的演变：固相和液相共存的部分凝固区域。这种系统具有单相系统所没有的不寻常的性质。一个例子是热对流和溶质使流动问题的非线性和导致形成固体无溶解通道，或“烟囱”，在固体基质的晶体结构的改变。在最近的实验室实验中观察到了一种非常复杂的烟囱对流模式：发现了一种新的对流“呼吸模式”，其中烟囱周期性地出现和消失。该项目旨在利用数学技术来理解观察到的行为。特别是，定常和驻波振荡对流模式之间的非线性相互作用将被阐明，和稳定的流动制度和它们的参数敏感性量化。还将进行进一步的实验室实验，以提供有关这一新发现现象的更详细信息。

项目成果

Interactions between steady and oscillatory convection in mushy layers

糊状层中稳定对流和振荡对流之间的相互作用

• DOI: 10.1017/s0022112009992709
• 发表时间: 2010
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: GUBA P