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

【摘要】：自然對流散熱是所有散熱方式中最可靠也最常見的散熱方式之一,雖然其散熱性能一般不及強迫對流情況,但由于擁有無需另外供給能源、性能可靠而穩(wěn)定、安全性高、無噪音且制造成本較低等優(yōu)點,在社會上得到了廣泛應(yīng)用。并且近年來,環(huán)境問題以及能源問題越來越受到關(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改變其幾何參數(shù),來降低熱阻,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)運而生。本文針對PCB等電子器件的自然散熱問題將建立一種新型的自然散熱器,該散熱器運用了功能分化的思想。文章將通過實驗和數(shù)值模擬的方法,通過和應(yīng)用最廣泛的直肋散熱器的對比,說明新型結(jié)構(gòu)的散熱器的先進性和創(chuàng)新性。本文的研究內(nèi)容主要會由以下幾個部分組成:(1)通過理論分析并進行實驗,來對相關(guān)的思想做出分析和驗證。在此基礎(chǔ)上,還會通過數(shù)值模擬和多個實驗的比對,驗證數(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,并采用計算流體力學(xué)軟件FLOTHERM來進行數(shù)值模擬,研究不同結(jié)構(gòu)、尺寸、溫差等參數(shù)對兩種散熱器的具體性能的影響,并對他們的溫度場和速度場分析研究,說明相關(guān)特性。(3)通過對實際案例的分析,運用數(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),進一步說明新型散熱器的散熱性能和經(jīng)濟性相比于傳統(tǒng)的直肋散熱器都有不小的優(yōu)勢。
[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)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN603

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本文編號：1567759