本文選題：泡沫金屬 + 對(duì)流換熱��； 參考：《華東理工大學(xué)》2015年碩士論文

【摘要】：泡沫金屬材料是一種新型的功能材料,其復(fù)雜的三維網(wǎng)狀結(jié)構(gòu)使其具有強(qiáng)化傳熱的效果,因此其在熱交換方面具有廣泛應(yīng)用前景。但是,因?yàn)殚_孔泡沫金屬具有非常復(fù)雜的內(nèi)部結(jié)構(gòu),目前還沒有其較為完善的強(qiáng)化傳熱機(jī)理及傳熱與阻力特性影響因素的系統(tǒng)研究。由于試驗(yàn)研究成本高,時(shí)間周期長,且其結(jié)構(gòu)復(fù)雜性,使得通過試驗(yàn)來觀察開孔泡沫金屬內(nèi)流體的流動(dòng)情況較為不易。而數(shù)值模擬方面,目前所采用的模型存在結(jié)構(gòu)簡(jiǎn)單、計(jì)算結(jié)果誤差較大或模型較為精確而計(jì)算耗時(shí)且計(jì)算硬件要求太高等問題。因此,本文提出了一種簡(jiǎn)化的六面體結(jié)構(gòu)模型,采用商業(yè)CFD軟件,對(duì)開孔泡沫金屬開展了系統(tǒng)的傳熱與阻力性能模擬分析。本文基于開孔泡沫金屬的微觀結(jié)構(gòu)分析,提出了一種簡(jiǎn)化的六面體結(jié)構(gòu)模型,通過與文獻(xiàn)試驗(yàn)結(jié)果對(duì)比,驗(yàn)證了該模型和數(shù)值模擬方法的可靠性和準(zhǔn)確性；基于提出的模型和方法,分析了泡沫金屬內(nèi)流體流場(chǎng)及溫度場(chǎng)分布的特點(diǎn)；結(jié)合綜合性能評(píng)價(jià)指標(biāo),考察分析了泡沫金屬孔隙率、孔密度、材料熱導(dǎo)率等關(guān)鍵參數(shù)對(duì)泡沫金屬傳熱和阻力性能的影響,并進(jìn)一步得到了該泡沫金屬的傳熱因子j和摩擦因子f的關(guān)聯(lián)式；最后,分析了不同孔結(jié)構(gòu)的湍動(dòng)能場(chǎng)、速度場(chǎng)、溫度場(chǎng)及壓力場(chǎng)分布特點(diǎn),進(jìn)一步從明確了泡沫金屬的強(qiáng)化傳熱機(jī)理,為板泡式換熱器的設(shè)計(jì)、優(yōu)化和工程應(yīng)用推廣提供基礎(chǔ)。
[Abstract]:Foamed metal material is a new type of functional material. It has the effect of enhancing heat transfer due to its complex three-dimensional network structure, so it has a wide application prospect in heat exchange. However, due to its complex internal structure, there is no systematic study on the mechanism of heat transfer enhancement and the influence factors of heat transfer and resistance characteristics. Because of the high cost, long time period and complicated structure, it is difficult to observe the flow of fluid in porous metal foam by experiment. However, in numerical simulation, the current model has some problems, such as simple structure, large error of calculation result or accuracy of model, time consuming and too high hardware requirement. Therefore, a simplified hexahedron structure model is presented in this paper. Commercial CFD software is used to simulate the heat transfer and resistance performance of porous metal foam. In this paper, a simplified hexahedron structure model is proposed based on the microstructure analysis of porous metal foam. The reliability and accuracy of the model and numerical simulation method are verified by comparing with the experimental results in literature. Based on the proposed model and method, the characteristics of fluid flow field and temperature field distribution in foam metal are analyzed, and the porosity and pore density of foam metal are investigated and analyzed in combination with the comprehensive performance evaluation index. The influence of material thermal conductivity and other key parameters on the heat transfer and resistance performance of foamed metal is obtained, and the correlation between the heat transfer factor j and friction factor f of the foam metal is obtained. Finally, the turbulent kinetic energy field and velocity field of different pore structures are analyzed. The distribution of temperature field and pressure field further clarified the mechanism of heat transfer enhancement of foam metal, which provided the basis for the design, optimization and engineering application of plate bubble heat exchanger.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB34

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本文編號(hào)：1983835