本文選題：自然散熱　切入點(diǎn)：新型結(jié)構(gòu)　出處：《上海交通大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：自然對(duì)流散熱是所有散熱方式中最可靠也最常見(jiàn)的散熱方式之一,雖然其散熱性能一般不及強(qiáng)迫對(duì)流情況,但由于擁有無(wú)需另外供給能源、性能可靠而穩(wěn)定、安全性高、無(wú)噪音且制造成本較低等優(yōu)點(diǎn),在社會(huì)上得到了廣泛應(yīng)用。并且近年來(lái),環(huán)境問(wèn)題以及能源問(wèn)題越來(lái)越受到關(guān)注,因此自然散熱器的發(fā)展是很有必要的。我們知道普通型材散熱器主要通過(guò)改變其幾何參數(shù),來(lái)降低熱阻,以期望獲得更好的散熱效果。可是,其結(jié)構(gòu)存在瓶頸,即,當(dāng)散熱器材料的導(dǎo)熱系數(shù)上升到一定程度后,散熱器的傳熱能力并不會(huì)再顯著提高,而是趨近不變。在這種情況下,一種新型結(jié)構(gòu)的自然散熱器應(yīng)運(yùn)而生。本文針對(duì)PCB等電子器件的自然散熱問(wèn)題將建立一種新型的自然散熱器,該散熱器運(yùn)用了功能分化的思想。文章將通過(guò)實(shí)驗(yàn)和數(shù)值模擬的方法,通過(guò)和應(yīng)用最廣泛的直肋散熱器的對(duì)比,說(shuō)明新型結(jié)構(gòu)的散熱器的先進(jìn)性和創(chuàng)新性。本文的研究?jī)?nèi)容主要會(huì)由以下幾個(gè)部分組成:(1)通過(guò)理論分析并進(jìn)行實(shí)驗(yàn),來(lái)對(duì)相關(guān)的思想做出分析和驗(yàn)證。在此基礎(chǔ)上,還會(huì)通過(guò)數(shù)值模擬和多個(gè)實(shí)驗(yàn)的比對(duì),驗(yàn)證數(shù)值模擬的可行性以及正確性。從而為后續(xù)章節(jié)的數(shù)值模擬研究做好鋪墊。(2)通過(guò)建立傳統(tǒng)直肋翅片散熱器和新型結(jié)構(gòu)散熱器的相關(guān)模型,并采用計(jì)算流體力學(xué)軟件FLOTHERM來(lái)進(jìn)行數(shù)值模擬,研究不同結(jié)構(gòu)、尺寸、溫差等參數(shù)對(duì)兩種散熱器的具體性能的影響,并對(duì)他們的溫度場(chǎng)和速度場(chǎng)分析研究,說(shuō)明相關(guān)特性。(3)通過(guò)對(duì)實(shí)際案例的分析,運(yùn)用數(shù)值模擬的方法展示新型結(jié)構(gòu)散熱器和直肋散熱器的表現(xiàn),進(jìn)一步說(shuō)明新型散熱器的散熱性能和經(jīng)濟(jì)性相比于傳統(tǒng)的直肋散熱器都有不小的優(yōu)勢(shì)。
[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.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN603

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本文編號(hào)：1567759