Fundamental Experimental and Numerical Convective Heat Transfer Research

对流传热基础实验和数值研究

• 批准号: RGPIN-2020-04327
• 负责人: Naylor, David
• 金额: $ 2.84万
• 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: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=739891
• 关键词: Fundamental; Experimental; Numerical; Convective; Heat

The primary focus of the proposed research program is the improved fundamental understanding of single phase convective heat transfer. Knowledge of complex convective heat transfer processes is essential for the skillful design of a wide range of technologies that involve the exchange of heat by a fluid. The engineering applications span all sectors of the economy. In the past Discovery Grant period, the applicant developed a new analytical and numerical approach (called dQdT) that more effectively characterizes convective heat transfer in situations where heat is exchanged between multiple surfaces with multiple driving temperature differences. One goal of the proposed research is to extend this new approach as an experimental method for characterizing multi-temperature convection. This will add a new research technique for investigations, and will enable the validation of numerical predictions by dQdT. Also, the numerical implementation of dQdT will be applied to improve our understanding of the underlying physics of the highly complex flows that are encountered in buildings. The motivation is to refine the accuracy of heat transfer predictions in building energy analysis. Improvements in the capability to predict the thermal performance of buildings will lead to more comfortable and energy efficient designs. Another arm of the proposed research examines the convective heat transfer enhancements that can be achieved using dilute nanofluids. Nanofluids combine nanoparticles and base fluids to create working fluids that have the potential for use in a wide range of cooling technologies. At present, the magnitude and mechanisms of the convective heat transfer enhancement remain poorly understood. The proposed research will investigate this effect for transparent water-based nanofluids, using an optical measurement technique called laser interferometry. The ability of optical methods to quantify and visualize the entire fluid temperature field opens up important opportunities for new fundamental insights into the heat transfer enhancements produced by dilute nanofluids. The proposed research will be undertaken as an integrated program involving a balance between state-of-the-art experimental methods and computational fluid dynamics modeling. This research will provide excellent training experiences for doctoral, master's and undergraduate students, and will lead to fundamental advances in the field of convective heat transfer.

提出的研究计划的主要焦点是提高对单相对流换热的基本理解。复杂的对流传热过程的知识是必不可少的，以熟练地设计广泛的技术，涉及热量交换的流体。工程应用涵盖经济的所有部门。在过去的发现基金期间，申请人开发了一种新的分析和数值方法（称为dQdT），可以更有效地表征在多个驱动温差的多个表面之间交换热量的对流传热。提出的研究目标之一是将这种新方法扩展为表征多温度对流的实验方法。这将为调查增加一种新的研究技术，并将使dQdT的数值预测得到验证。此外，dQdT的数值实现将被应用于提高我们对建筑物中遇到的高度复杂流的底层物理的理解。其动机是提高建筑能源分析中传热预测的准确性。预测建筑物热性能的能力的提高将导致更舒适和节能的设计。拟议研究的另一个方面是研究使用稀释纳米流体可以实现的对流传热增强。纳米流体将纳米颗粒和基础流体结合在一起，创造出具有广泛应用于冷却技术潜力的工作流体。目前，对流换热增强的幅度和机制仍然知之甚少。这项被提议的研究将使用一种叫做激光干涉测量的光学测量技术来研究透明水基纳米流体的这种效应。光学方法量化和可视化整个流体温度场的能力为稀纳米流体产生的传热增强的新基本见解开辟了重要的机会。拟议的研究将作为一个综合项目进行，涉及最先进的实验方法和计算流体动力学建模之间的平衡。该研究将为博士生、硕士生和本科生提供良好的培养经验，并将导致对流换热领域的根本性进展。