Fluid Flow and Heat and Mass Transfer in Micro-systems with Complex Physics

复杂物理微系统中的流体流动和传热传质

• 批准号: RGPIN-2017-03723
• 负责人: Mohamad, Abdulmajeed
• 金额: $ 1.82万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=659964
• 关键词: Fluid; Flow; Heat; Mass; Transfer

Fluid flow and heat and mass transfers in micro devices have many engineering applications in utilizing, detecting, sensing, monitoring, and diagnosis of environmental, industrial, biological, and biomedical systems. There is a need for cheap, reliable, real-time devices to diagnose diseases, monitor environmentally harmful gases, detect biological and chemical warfare agents, etc. The focus of the current proposal will be on investigating the physics of flow and droplets in microfluidic systems. Mathematical models and simulation tools need to be developed. The newly created knowledge leads to better understanding the operation of droplet micro devices, improve the design of novel diagnostic devices, such as flow focusing and digital droplet devices, and in developing a new technology. In the long term, it is intended to expand our results for developing industrial and environmental monitoring devices. ***Microfluidic and Nanofluidic devices have emerged as potent instruments for diagnosis of diseases. Extensive research has been done on different types of microfluidic devices for a wide spectrum of applications with different geometrical configurations. However, most of the works are done by a trial and error to optimize the operation in those devices. The flow is laminar, where the mixing process is mainly controlled by a slow diffusion mechanism. The fluid flow is also in two or multi-phases with droplets. The mixing processes are usually carried out by an applied external force, such as electric, thermal, magnetic, or acoustic. The topic of two or multi-phase and/or multicomponent flows is a very challenging task, computationally. Most analysis has been based on empirical correlations and non-exact science. Moreover, the fluid-structure interaction on micro- and nano-scales is not fully understood. The problem becomes more challenging with extra physics, such as electrical force, Joule heating, unsteady flows, etc. Hence, there is a need to understand and develop solid underlying physics of the problem and develop a mathematical model for simulations of those devices.***The simulation results help us to understand the physics and the effects of the controlling parameters. Also, simulation is cost effective in the optimization process of such devices. Conventional CFD methods have many limitations when it comes to dealing with multi-phase flows. On the other hand, the Lattice Boltzmann method (LBM) is a very powerful alternative method compared with the conventional methods to solve fluid dynamics problems. In LBM, it is relatively easy to integrate thermodynamics with transport equations. Besides, it enjoys simple coding and can be easily used with parallel processor computers. The outcome of the research will help in developing novel, reliable and real-time, droplet-based microfluidic devices for many applications. The outcomes will contribute to the Canadian economy.

微型设备中的流体流量，热量和质量转移在利用，检测，感应，监测和诊断环境，工业，生物学和生物医学系统方面具有许多工程应用。需要廉价，可靠，实时设备来诊断疾病，监测环境有害的气体，检测生物学和化学战剂等。当前建议的重点将是研究微流体系统中流量和液滴的物理学。需要开发数学模型和仿真工具。新创建的知识可以更好地理解液滴微型设备的运行，改善新型诊断设备的设计，例如聚焦和数字液滴设备，以及开发新技术。从长远来看，它旨在扩大我们的成果，以开发工业和环境监测设备。 ***微流体和纳米流体设备已成为诊断疾病的有效工具。针对不同类型的微流体设备进行了广泛的研究，用于具有不同几何配置的广泛应用。但是，大多数工作都是通过反复试验来完成的，以优化这些设备中的操作。流是层流，其中混合过程主要由缓慢的扩散机制控制。流体流也有两个或多个液滴。混合过程通常由施加的外力（例如电气，热，磁性或声学）进行。在计算上，两个或多相和/或多组分流的主题是一项非常具有挑战性的任务。大多数分析都是基于经验相关性和非杰出科学的。此外，尚不完全了解微型和纳米尺度上的流体结构相互作用。由于电力，焦耳加热，不稳定的流量等额外的物理学，问题变得更加具有挑战性。因此，需要了解问题的固体物理，并开发出用于模拟这些设备的数学模型。***。 **仿真结果有助于我们了解控制参数的物理和影响。同样，模拟在此类设备的优化过程中具有成本效益。传统的CFD方法在处理多相流时有许多局限性。另一方面，与解决流体动力学问题的常规方法相比，晶格Boltzmann方法（LBM）是一种非常强大的替代方法。在LBM中，将热力学与传输方程相结合相对容易。此外，它享有简单的编码，并且可以与并行处理器计算机轻松使用。该研究的结果将有助于开发用于许多应用的新颖，可靠和实时的基于液滴的微流体设备。结果将有助于加拿大经济。