本文選題：重力熱管 + 傳熱強(qiáng)化�。� 參考：《山東大學(xué)》2015年碩士論文

【摘要】：重力熱管是一種高效傳熱元件,具有結(jié)構(gòu)組成簡單、加工制造方便,生產(chǎn)成本低廉等優(yōu)點(diǎn),可廣泛應(yīng)用于工業(yè)生產(chǎn)的各個(gè)換熱場合。隨著近年來國家對能源環(huán)境問題的重視,強(qiáng)化重力熱管的傳熱性能成為重力熱管研究的重要熱點(diǎn)內(nèi)容,作者通過查閱相關(guān)文獻(xiàn),掌握重力熱管強(qiáng)化傳熱研究現(xiàn)狀,現(xiàn)有的強(qiáng)化傳熱方式可大體分為：采用高效工質(zhì)、進(jìn)行管內(nèi)表面處理及設(shè)置管內(nèi)插件等。其中采用高效工作介質(zhì)進(jìn)行重力熱管性能強(qiáng)化是當(dāng)前的研究熱點(diǎn),自濕潤流體作為新近提出的一種高效工作介質(zhì),在重力熱管中的應(yīng)用研究較少,還不夠全面。因而本課題選用自濕潤流體作為重力熱管工質(zhì),對自濕潤流體重力熱管的傳熱特性進(jìn)行深入研究。本文以自濕潤流體重力熱管作為研究對象,通過改變實(shí)驗(yàn)設(shè)計(jì)參數(shù)對其基本傳熱特性進(jìn)行了研究,通過與水工質(zhì)重力熱管進(jìn)行對比,對其強(qiáng)化傳熱特性、小傾角強(qiáng)化特性及復(fù)合強(qiáng)化特性進(jìn)行了研究。主要研究工作及結(jié)論如下：1、通過查閱相關(guān)文獻(xiàn),對重力熱管強(qiáng)化傳熱研究現(xiàn)狀進(jìn)行了綜述,掌握了重力熱管的基本傳熱理論及自濕潤流體的強(qiáng)化傳熱機(jī)理。2、完成了重力熱管的加工制造及實(shí)驗(yàn)臺(tái)搭建。制作了兩種工質(zhì)的重力熱管,設(shè)計(jì)并搭建了實(shí)驗(yàn)所用的實(shí)驗(yàn)平臺(tái),確定了熱管性能測試實(shí)驗(yàn)方案及實(shí)驗(yàn)數(shù)據(jù)處理方法。3、實(shí)驗(yàn)研究了自濕潤流體重力熱管基本傳熱特性。得出如下結(jié)論,重力熱管熱阻隨加熱功率、傾角及充液率的增大均先減小后增大；最佳傾角隨加熱功率的升高而減��；實(shí)驗(yàn)得出最佳充液率為熱管蒸發(fā)段容積的180%左右。4、實(shí)驗(yàn)研究了自濕潤流體強(qiáng)化傳熱特性,得出結(jié)論如下：自濕潤流體能夠減小重力熱管的啟動(dòng)時(shí)間,但啟動(dòng)溫度有所升高,隨著功率的升高,啟動(dòng)時(shí)間及啟動(dòng)溫度逐漸接近水工質(zhì)；水平放置時(shí),自濕潤流體降低重力熱管熱阻、增大了傳熱極限,大幅改善重力熱管性能；垂直放置時(shí)對重力熱管性能略有惡化。5、實(shí)驗(yàn)研究了自濕潤流體小傾角強(qiáng)化傳熱特性,得出結(jié)論如下：小傾角時(shí)重力熱管運(yùn)行溫度、軸向溫差及熱阻高于水工質(zhì)熱管,但傳熱極限顯著提升,因而相比水,自濕潤流體在小傾角下仍有一定應(yīng)用優(yōu)勢。6,、實(shí)驗(yàn)研究了垂直放置時(shí)自濕潤流體及內(nèi)螺紋表面結(jié)構(gòu)復(fù)合強(qiáng)化作用對重力熱管傳熱特性的影響,得出如下結(jié)論：復(fù)合強(qiáng)化作用可以降低重力熱管運(yùn)行溫度,減小熱阻,增大蒸發(fā)段及冷凝段換熱系數(shù),全面強(qiáng)化重力熱管的傳熱性能。
[Abstract]:Gravity heat pipe is an efficient heat transfer element, which has the advantages of simple structure, convenient manufacturing and low production cost. It can be widely used in various heat transfer situations in industrial production. With the attention paid to energy and environmental problems in recent years, the enhancement of heat transfer performance of gravity heat pipe has become an important hot topic in the research of gravity heat pipe. The existing heat transfer enhancement methods can be divided into: efficient working fluid, tube surface treatment and installation of tube plug-in and so on. It is a hot topic to strengthen the performance of gravity heat pipe by using high efficiency working medium. As a newly proposed high efficiency working medium, self-wetting fluid has little application in gravity heat pipe and is not comprehensive enough. Therefore, the self-wetting fluid is chosen as the working medium of gravity heat pipe, and the heat transfer characteristics of the self-wetting fluid gravity heat pipe are studied in depth. In this paper, the basic heat transfer characteristics of self-wetting fluid gravity heat pipe are studied by changing the experimental design parameters, and the heat transfer characteristics are enhanced by comparison with the water working fluid gravity heat pipe. The characteristics of small dip angle strengthening and composite strengthening were studied. The main research work and conclusions are as follows: 1. By consulting relevant documents, the current situation of heat transfer enhancement in gravity heat pipe is summarized. The basic heat transfer theory of gravity heat pipe and the mechanism of heat transfer enhancement of self-wetting fluid are mastered, and the manufacture of gravity heat pipe and the construction of experimental bench are completed. The gravity heat pipe with two kinds of working fluids was made and the experimental platform was designed and built. The experimental scheme of heat pipe performance test and the experimental data processing method were determined. The basic heat transfer characteristics of self-wetting fluid gravity heat pipe were studied experimentally. The following conclusions are drawn: the thermal resistance of gravity heat pipe decreases first and then increases with the increase of heating power, inclination angle and liquid filling rate, and the optimum inclination angle decreases with the increase of heating power. The experimental results show that the best liquid filling rate is about 180% of the volume of the evaporative section of the heat pipe. The heat transfer characteristics of the self-wetting fluid are studied experimentally. The conclusion is as follows: the self-wetting fluid can reduce the starting time of the gravity heat pipe, but the starting temperature is increased. With the increase of power, the starting time and starting temperature are close to hydraulic quality, the self-wetting fluid reduces the heat resistance of gravity heat pipe, increases the heat transfer limit, and improves the performance of gravity heat pipe greatly. The performance of gravity heat pipe is slightly deteriorated when placed vertically. The heat transfer enhancement characteristics of self-wetting fluid with small dip angle are studied experimentally. The conclusions are as follows: the operating temperature, axial temperature difference and thermal resistance of gravity heat pipe are higher than those of water heat pipe with small dip angle. But the heat transfer limit is obviously raised, so the self-wetting fluid still has a certain application advantage under the small dip angle compared with the water. The influence of self-wetting fluid and the surface structure of the internal thread on the heat transfer characteristics of the gravity heat pipe under vertical placing is studied experimentally. The conclusion is as follows: the combined strengthening effect can reduce the operating temperature of the gravity heat pipe, reduce the thermal resistance, increase the heat transfer coefficient of the evaporation section and the condensing section, and enhance the heat transfer performance of the gravity heat pipe in an all-round way.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TK172.4

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