自然对流条件下一种新型结构散热器的散热研究

发布时间：2018-03-04 23:20

本文选题：自然散热　切入点：新型结构　出处：《上海交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：自然对流散热是所有散热方式中最可靠也最常见的散热方式之一,虽然其散热性能一般不及强迫对流情况,但由于拥有无需另外供给能源、性能可靠而稳定、安全性高、无噪音且制造成本较低等优点,在社会上得到了广泛应用。并且近年来,环境问题以及能源问题越来越受到关注,因此自然散热器的发展是很有必要的。我们知道普通型材散热器主要通过改变其几何参数,来降低热阻,以期望获得更好的散热效果。可是,其结构存在瓶颈,即,当散热器材料的导热系数上升到一定程度后,散热器的传热能力并不会再显著提高,而是趋近不变。在这种情况下,一种新型结构的自然散热器应运而生。本文针对PCB等电子器件的自然散热问题将建立一种新型的自然散热器,该散热器运用了功能分化的思想。文章将通过实验和数值模拟的方法,通过和应用最广泛的直肋散热器的对比,说明新型结构的散热器的先进性和创新性。本文的研究内容主要会由以下几个部分组成:(1)通过理论分析并进行实验,来对相关的思想做出分析和验证。在此基础上,还会通过数值模拟和多个实验的比对,验证数值模拟的可行性以及正确性。从而为后续章节的数值模拟研究做好铺垫。(2)通过建立传统直肋翅片散热器和新型结构散热器的相关模型,并采用计算流体力学软件FLOTHERM来进行数值模拟,研究不同结构、尺寸、温差等参数对两种散热器的具体性能的影响,并对他们的温度场和速度场分析研究,说明相关特性。(3)通过对实际案例的分析,运用数值模拟的方法展示新型结构散热器和直肋散热器的表现,进一步说明新型散热器的散热性能和经济性相比于传统的直肋散热器都有不小的优势。
[Abstract]:Natural convection heat dissipation is one of the most reliable and common heat dissipation methods. Although its heat dissipation performance is generally inferior to that of forced convection, its performance is reliable, stable and safe because it does not require additional energy supply. Noise free and low manufacturing costs have been widely used in society. In recent years, environmental and energy problems have attracted more and more attention. So the development of the natural radiator is very necessary. We know that the common profile radiator can reduce the thermal resistance by changing its geometric parameters, in order to get better heat dissipation effect. However, the structure of the radiator has a bottleneck, that is, When the heat conductivity of the radiator material rises to a certain extent, the heat transfer capacity of the radiator will not be significantly improved, but the heat transfer capacity will remain the same. A new type of natural radiator has emerged as the times require. In this paper, a new type of natural radiator will be established to solve the problem of natural heat dissipation of electronic devices such as PCB. The radiator uses the idea of functional differentiation. This paper will compare it with the most widely used straight-ribbed radiator by means of experiments and numerical simulation. The research content of this paper will be composed of the following parts: 1. Through theoretical analysis and experiments to analyze and verify the relevant ideas. And through numerical simulations and multiple experiments, To verify the feasibility and correctness of the numerical simulation. Therefore, to pave the way for the numerical simulation research in the following chapters, the related models of the traditional straight-fin radiator and the new structural radiator are established, and the corresponding models of the traditional straight-finned fin radiator and the new structural radiator are established. The numerical simulation is carried out by using the computational fluid dynamics software FLOTHERM to study the influence of different structure, size and temperature difference on the performance of the two radiators, and to analyze their temperature field and velocity field. Through the analysis of practical cases, numerical simulation is used to demonstrate the performance of new type of structural radiators and straight-ribbed radiators. It is further explained that the heat dissipation performance and economy of the new type radiator are superior to those of the traditional straight-ribbed radiator.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN603

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