Numerical Studies of Turbulent Multiphase Flows and Heat Transfer in Industrial Thermofluid Systems

现代热流体系统的日益复杂，对改进的设计工具提出了越来越严格的要求，这反过来又要求更好地了解热流体系统中的流体流动和热传递。改进现有设计工具的一种可行且相当廉价的方法是开发先进的数值模型。因此，可以减少对耗时且往往昂贵的测试的需求。这项建议涉及建立和验证数学和数值模型及其在工业中的应用，以改进/优化热流体系统。 这项研究的主要目标是开发用于多相流模拟的精确数值模型，并开发用于工业热流体系统的CFD辅助控制系统设计技术。这项研究的目标是：(1)改进冷凝器内汽液两相流动模拟的数值模型，(2)开发和验证CFB反应器内包括化学反应在内的气固和液-固两相流动模拟的数值模型和技术，(3)开发和验证工业干燥过程中气固两相流动和传热传质的数值模型，以提高其效率，(4)发展一种使用CFD辅助方法的工业炉膛及其控制系统的集成设计方法，以减少NOx排放，(5)开展SCWR的CFD辅助控制系统设计，提高SCWR的安全性和效率。 这项研究的意义在于，它将为高效工业热流体系统的设计提供改进的设计工具，减少燃烧产生的污染物，更重要的是，它将培养高素质的人才(6名博士和2名硕士研究生)，他们不仅拥有流体流动和传热数值模拟的一般知识，而且具有在各种工业应用中应用一般知识的能力。

The growing complexity of modern thermofluid systems has imposed increasingly stringent requirements on enhanced design tools, which, in turn, requires a better understanding of the fluid flow and heat transfer in thermofluid systems. A viable and reasonably inexpensive approach to improve the existing design tools is through the development of advanced numerical models. Thus, the need for time-consuming and often costly testing can be reduced. This proposal deals with formulating and verifying mathematical and numerical models and their applications in industries to improve/optimize the thermofluid systems. The main objectives of the proposed research are to develop accurate numerical models for simulations of multiphase flows and to develop CFD assisted control system design techniques for industrial thermofluid systems. The goals of this proposed research are: (1) to improve the numerical models for the simulation of vapour-liquid two-phase flows in condensers, (2) to develop and validate numerical models and techniques for the simulations of gas-solid and liquid-solid two-phase flows in CFB reactors including chemical reactions, (3) to develop and validate numerical models for the simulations of gas-solid two-phase flows, and heat and mass transfers in industrial drying processes in order to improve their efficiency, (4) to develop an integrated design methodology for industrial furnaces and their control systems using CFD assisted approach to reduce NOx emission, and (5) to develop CFD assisted control system design for SCWR to improve the safety and efficiency of SCWR. The significance of the proposed research is that it will provide improved design tools for designs of high efficiency industrial thermofluid systems, reduce the combustion-generated pollutants, and more importantly train highly qualified personnel (6 Ph.D. and 2 master's students) who will not only have the general knowledge of numerical simulations of fluid flow and heat transfer, but also have the ability to apply the general knowledge in various industrial applications.