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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=680972
• 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.**

在许多非计算机相关设备中使用的电子部件需要冷却以便有效地操作。虽然这些设备的冷却不会造成像计算机系统中出现的那样严重的困难，但确保适当的热管理可能具有挑战性。这些组件，例如工业测量系统中的组件，由于其高可靠性和成本效益，通常通过自然对流进行冷却。充分的热管理需要了解在这种设备中出现的情况下存在的自然对流传热速率。该研究计划旨在通过提供广泛的重要的新的基本信息，用于此类冷却系统的设计来实现这一目标。所考虑的情况是那些发生在现实世界中的电子元件冷却的简化模型。组件将被建模为嵌入周围平坦表面的各种形状的平坦加热元件，并且在大多数情况下，假设是水平的。拟议的研究领域涉及数值和实验工作，包括：*1 获得一系列元件形状的层流、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增加水平元件的传热速率。* 3 当多个水平元件靠近在一起时，相邻表面上的流动的相互作用可能发生，从而影响热传递速率。将对这一影响进行研究 * 4研究元件表面存在的热条件对传热率的影响。* 5研究一个水平元件与一个平行的覆盖表面之间的热传递率。* 6研究元件与水平面成小角度倾斜时的传热率。* 7确定如果热传递发生在纳米流体而不是空气中，是否可以增加元件的热传递速率。* 这些成果对涉及非计算机电子元件的工业系统的设计者具有相当大的价值。这些结果将为他们提供改进和更广泛的方法来估计传热速率，这将允许更准确地预测组件的工作温度。这将有助于设计效率更高、成本更低的系统，从而有可能提高加拿大在这一领域的工业竞争力。研究结果也将促进对所涉及的自然对流类型的基本认识。该研究计划涉及申请人及其研究小组拥有丰富经验和专业知识的领域。* 参与这项研究的HQP将获得涉及新的和具有挑战性的问题的领域的经验和技术专长，并获得使用先进的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的准备。**