Numerical and Experimental Studies of Natural Convective Heat Transfer from Horizontal and Near Horizontal Plane Heated Surfaces of Various Shapes

各种形状的水平和近水平面受热面自然对流换热的数值与实验研究

• 批准号: RGPIN-2015-06444
• 负责人: Oosthuizen, Patrick
• 金额: $ 1.82万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=614154
• 关键词: Numerical; Experimental; Studies; Natural; Convective

Electronic components used in many non-computer related devices require cooling in order to operate effectively. While cooling of such devices does not pose difficulties as severe as those arising in computer systems, ensuring adequate thermal management can be challenging. Such components, e.g. those in industrial measuring systems, are often cooled by natural convection due to its high reliability and cost effectiveness. Adequate thermal management requires knowledge of the natural convective heat transfer rates that exist in situations arising in such devices. This research program aims to accomplish this by providing a wide range of important new basic information for use in the design of such cooling systems. Situations considered are simplified models of those occurring in real-world electronic component cooling. Components will be modeled as flat heated elements of various shapes embedded in a surrounding flat surface, and in most cases, assumed to be horizontal. Proposed study areas, which involve numerical and experimental work, are: 1   Obtain heat transfer results for conditions where laminar, transitional and turbulent flow exists for a range of element shapes. Practical equations that describe the results will be generated. 2  Study whether wavy shaped surfaces can increase the heat transfer rate from a horizontal element. 3   When multiple horizontal elements are close together, interaction of the flows over adjacent surfaces can occur affecting the heat transfer rates. This effect will be studied. 4  Investigate the effect of thermal conditions existing at the element surface on the heat transfer rate. 5  Study the heat transfer rate from a horizontal element with a parallel shrouding surface over it. 6  Study the heat transfer rate when the element is inclined at a small angle to the horizontal. 7  Determine if the heat transfer rate from an element can be increased if heat transfer occurs to a nanofluid rather than air. The outcomes will be of considerable value to designers of industrial systems involving non-computer electronic components. These outcomes will provide them with improved and more extensive methods for estimating heat transfer rates which will allow the more accurate prediction of operating temperatures of the components. This will permit more efficient and lower cost systems to be designed and hence will potentially enhance Canada’s industrial competitiveness in this field. The results will also advance basic knowledge of the type of natural convective flows involved. This research program involves work in an area in which the applicant and his research group have extensive experience and expertise. HQP involved in this research will gain experience and technical expertise in areas involving new and challenging problems and gain experience in the use of advanced numerical and experimental procedures. They will be well prepared for careers in either industry or academia.

许多非计算机相关设备中使用的电子组件需要冷却才能有效运行，虽然此类设备的冷却并不一定会造成像计算机系统中出现的那样严重的困难，但适当的热管理可能具有挑战性。由于其高可靠性和成本效益，工业测量系统通常通过自然对流进行冷却。充分的热管理需要了解此类设备中存在的自然对流传热率。广泛的重要新基础知识用于设计此类冷却系统的信息是现实世界电子元件冷却中发生的情况的简化模型，组件将被建模为嵌入周围平坦表面的各种形状的扁平加热元件。假设是水平的。 涉及数值和实验工作的拟议研究领域是： 1 获得一系列单元形状存在层流、过渡流和湍流条件下的传热结果 将生成描述结果的实用方程。 2 研究波浪形表面是否可以提高水平元件的传热率。 3 当多个水平元件靠近时，相邻表面上的流动可能会发生相互作用，从而影响传热速率。 4 研究元件表面的热条件对传热速率的影响。 5 研究其上具有平行覆盖表面的水平元件的传热率。 6 研究元件与水平面成小角度倾斜时的传热速率。 7 确定如果传热发生在纳米流体而不是空气上，元件的传热率是否会增加。 这些结果对于工业系统非计算机电子元件的设计者来说具有相当大的价值，这些结果将涉及他们改进和更广泛的估计传热率的方法，这将允许更准确地预测元件的工作温度。允许设计更高效和更低成本的系统，因此将有可能增强加拿大在该领域的工业竞争力。该研究结果还将推进申请人所涉及的自然对流类型的基础知识。和他的研究团队拥有丰富的经验专业知识。 参与这项研究的总部人员将在新的和具有挑战性的问题领域获得经验和技术专业知识，并获得涉及使用先进数值和实验程序的经验。他们将为工业界或学术界的职业生涯做好充分准备。