Thermo-solutal convection with soret effect

具有 Soret 效应的热溶质对流

• 批准号: 227742-2009
• 负责人: Saghir, Ziad
• 金额: $ 2.19万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=425258
• 关键词: Thermo; solutal; convection; soret; effect

The thermodiffusion phenomenon, also known as thermal diffusion or the Soret effect (in liquids), describes the coupling between a temperature gradient and the resulting mass flux in a multi-component system. While thermodiffusion in gases is being widely investigated and is well explained by the kinetic theory, thermodiffusion in liquids has also given rise to increasing scientific and engineering interest in recent years. For example, it has been postulated that thermodiffusion is integral to the analysis of the composition distribution in oil reservoirs. Some researchers have speculated that the thermodiffusion of biomacromolecules may play a role in the origin of life. The proposed research firstly focuses on the continual investigation of solutal thermal convection during the growth process of Silicon Germanium (SiGe) material using the Travelling Solvent Method (TSM). Secondly, the research aims to further extend the study of thermodiffusion convection in an inhomogeneous porous cavity. With respect to the former portion of the proposed research, TSM is a relatively new and promising technique for the production of high quality semiconductor materials. Achieving high purity SiGe semiconductor material is a pivotal aspect of the production of photodetectors and solar cells. We propose to use magnetic fields in order to suppress buoyancy convection, thus allowing for a detailed study of thermodiffusion in Si/SiGe system. The obtained numerical/theoretical results will be compared with undergoing experimental research at Dalhousie University. With respect to the latter part of the proposed research, the investigation will be extended to study fluid flow, heat and mass transfer in inhomogeneous porous media filled with different binary hydrocarbon mixtures at high pressure. The molecular and thermodiffusion coefficients for different mixtures will be estimated as function of the temperature and concentration at each point of the finite element grid. Then the numerical results will be compared with the experimental setup that is currently at the Universite de Pau in France.

热扩散现象，也称为热扩散或Soret效应（在液体中），描述了多组分系统中温度梯度和所得质量通量之间的耦合。虽然气体中的热扩散被广泛研究，并很好地解释了动力学理论，热扩散在液体中也引起了越来越多的科学和工程的兴趣，在最近几年。例如，已经假定热扩散对于分析油藏中的成分分布是不可或缺的。一些研究人员推测，生物大分子的热扩散可能在生命起源中发挥作用。本研究首先利用移动溶剂法（TSM）对锗硅（SiGe）材料生长过程中的溶质热对流进行了连续研究。其次，本研究旨在进一步拓展非均匀多孔腔内热扩散对流的研究。相对于前一部分的拟议研究，TSM是一个相对较新的和有前途的技术，用于生产高品质的半导体材料。获得高纯度SiGe半导体材料是生产光电探测器和太阳能电池的关键方面。我们建议使用磁场，以抑制浮力对流，从而允许在Si/SiGe系统中的热扩散的详细研究。所获得的数值/理论结果将进行比较，在达尔豪西大学的实验研究。关于拟议研究的后一部分，调查将扩展到研究高压下填充不同二元烃混合物的非均匀多孔介质中的流体流动、传热和传质。不同混合物的分子和热扩散系数将被估计为在有限元网格的每个点处的温度和浓度的函数。然后将数值结果与目前在法国波城大学的实验装置进行比较。