Multiphase flow modelling of chemical processes

化学过程的多相流建模

• 批准号: 5740-2006
• 负责人: Nandakumar, Krishnaswamy
• 金额: $ 3.57万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=331528
• 关键词: Multiphase; flow; modelling; chemical; processes

Multiphase flows are ubiquitous in chemical and mineral processing operations. Examples are: (a) bitumen extraction where in bitumen, water, sand and air are contacted either in the hydro transport lines or in rotating tumblers, followed by processing in separation vessels and flotation devices, (b) distillation columns and (c) fluidized beds. Yet fundamental understanding of these flows is very difficult to develop resulting in simplifying assumptions that are invoked to enable simple design procedures. Examples such as the ideal distillation tray, well stirred mixing tank with homogenous compositions are very common in chemical engineering. These simplifications, while allowing simple design procedures to be developed, often limit the ability of designers to scale up an operation from bench scale to pilot scale to full plant scale. Fortunately powerful computers and recent computational algorithms are enabling development of computational fluid dynamics and in particular direct simulation of multiphase flows. My main contributions have been both in the development of next generation, efficient algorithms as well as applications of CFD to many practical problems encountered in the energy sector. During the next period of research under this Discovery Grant, I plan to continue the study of multiphase flows for handling both solid-fluid systems and fluid-fluid systems . The focus will be on flow of two phase mixtures in complex geometries like the twin-screw extruders encountered polymer processing, micro fluidic devices encountered in Lab-on-A-Chipo devices, flow in fuel cell stacks.

多相流在化学和矿物加工操作中无处不在。示例是：（a）沥青提取，其中在水力运输线或旋转玻璃杯中与沥青，水，沙子和空气接触，然后在分离容器和浮选设备中加工，（b）蒸馏柱和（c）流体床。然而，对这些流的基本了解很难发展，从而简化了被调用以实现简单设计程序的假设。在化学工程中，诸如理想的蒸馏托盘，搅拌均匀的混合罐之类的例子非常常见。这些简化的同时，可以制定简单的设计程序，但通常会限制设计人员从基准尺度到飞行员规模扩大操作到全工厂规模的能力。幸运的是，强大的计算机和最近的计算算法正在实现计算流体动力学的开发，特别是对多相流的直接模拟。我的主要贡献既是下一代，有效算法的发展以及CFD在能源领域遇到的许多实际问题的应用。在此发现资助下的下一个研究期间，我计划继续研究多相流，用于处理固体流体系统和流体流体系统。重点将放在复杂几何形状中的两种相混合物中的流动，例如遇到的聚合物加工，在实验室内实验室设备中遇到的微流体设备，燃料电池堆中的流量。