本文選題：直接接觸換熱 + 真實(shí)傳熱溫差��； 參考：《天津大學(xué)》2015年博士論文

【摘要】：直接接觸換熱作為新型高效節(jié)能換熱器的核心技術(shù)是能源研究的重點(diǎn),直接接觸式換熱沒(méi)有金屬換熱面,具有傳熱熱阻低、換熱系數(shù)高、結(jié)構(gòu)簡(jiǎn)單、不易腐蝕和結(jié)垢等傳統(tǒng)間壁換熱無(wú)法比擬的優(yōu)勢(shì)。應(yīng)用直接接觸換熱技術(shù)可以減小換熱器的換熱溫差,提高換熱器的換熱效率。本文擬從戊烷-水直接接觸換熱的真實(shí)傳熱溫差,泡滴群傳熱的機(jī)理,換熱器傳熱性能三個(gè)方面開(kāi)展理論與實(shí)驗(yàn)研究。目的在于為提高直接接觸換熱效率提供依據(jù),并對(duì)強(qiáng)化換熱技術(shù)提供理論指導(dǎo),為能源的高效利用和解決世界的能源問(wèn)題開(kāi)發(fā)新思路。首先,提出了一種新型的實(shí)驗(yàn)方法來(lái)研究戊烷-水直接接觸汽化傳熱,通過(guò)搭建戊烷與水的直接接觸閉路循環(huán)實(shí)驗(yàn)裝置,使得戊烷-水液液直接接觸界面的接觸面積保持不變,并且水在界面上各點(diǎn)的速度均相同。采用紅外熱像法研究戊烷-水直接接觸界面的真實(shí)傳熱溫差,結(jié)果表明其真實(shí)的傳熱溫差遠(yuǎn)遠(yuǎn)小于傳統(tǒng)算法得到的傳熱溫差,因此得到的傳熱系數(shù)也遠(yuǎn)遠(yuǎn)大于基于傳統(tǒng)傳熱溫差得到的傳熱系數(shù)。在此基礎(chǔ)上研究流量和真實(shí)傳熱溫差對(duì)傳熱系數(shù)的影響。實(shí)驗(yàn)揭示了傳熱熱阻主要集中在水主體與界面水的混合程度上的機(jī)理。其次,采用頻閃攝像法研究二維體中戊烷泡滴群在連續(xù)相水中的汽化傳熱過(guò)程,采用統(tǒng)計(jì)學(xué)方法研究泡滴在不同戊烷進(jìn)口流量,水溫及不同高度條件下戊烷泡滴分布情況,同時(shí)研究了不同實(shí)驗(yàn)條件對(duì)戊烷泡滴的Sauter平均直徑,汽化率、泡滴上升速度、戊烷泡滴的戊烷-水液液界面的傳熱面積及戊烷泡滴傳熱系數(shù)的影響規(guī)律。根據(jù)實(shí)驗(yàn)結(jié)果對(duì)傳熱區(qū)域進(jìn)行劃分,表明流體湍動(dòng)越劇烈傳熱能力越強(qiáng)。最后,搭建戊烷-水直接接觸換熱系統(tǒng),考察了分散相戊烷進(jìn)口流量、水的溫度和分布器孔徑對(duì)體積換熱系數(shù)的影響,并依據(jù)傳熱機(jī)理詳細(xì)分析了直接接觸換熱器換熱性能的影響因素,與加入填料的換熱器進(jìn)行對(duì)比,研究了填料對(duì)換熱的強(qiáng)化作用。
[Abstract]:Direct contact heat transfer is the key technology of energy research. Direct contact heat transfer has low heat resistance, high heat transfer coefficient and simple structure. It is not easy to corrode and scale and other traditional interwall heat transfer can not be compared with the advantages. The application of direct contact heat transfer technology can reduce the heat transfer temperature difference and improve the heat transfer efficiency of the heat exchanger. In this paper, theoretical and experimental studies are carried out on the real heat transfer temperature difference of pentane water direct contact heat transfer, the heat transfer mechanism of bubble droplet group and the heat transfer performance of heat exchanger. The purpose of this paper is to provide the basis for improving the efficiency of direct contact heat transfer and to provide theoretical guidance for strengthening heat transfer technology, so as to develop new ideas for the efficient utilization of energy and the solution of energy problems in the world. First of all, a new experimental method is proposed to study the vaporization heat transfer of pentane-water direct contact. The contact area of the direct contact interface between pentane and water remains unchanged by setting up a closed circuit experimental device for the direct contact between pentane and water. And the velocity of water at all points on the interface is the same. The real heat transfer temperature difference between pentane and water directly contact interface is studied by infrared thermal image method. The results show that the real heat transfer temperature difference is much smaller than that obtained by traditional algorithm. Therefore, the heat transfer coefficient obtained is much larger than that based on the traditional heat transfer temperature difference. On this basis, the influence of flow rate and real heat transfer temperature difference on heat transfer coefficient is studied. The experimental results show that the heat transfer resistance is mainly concentrated on the mixing degree between the water body and the interface water. Secondly, the vaporization and heat transfer process of pentane bubble droplets in continuous phase water was studied by stroboscopic camera, and the distribution of pentane bubble droplets at different flow rate, water temperature and height was studied by statistical method. The effects of different experimental conditions on the Sauter mean diameter, vaporization rate, droplet rising rate, the heat transfer area of the pentane droplet's pentane liquid-liquid interface and the heat transfer coefficient of the pentane bubble droplet were also studied. According to the experimental results, the heat transfer region is divided, which shows that the more intense the fluid turbulence, the stronger the heat transfer ability. Finally, the direct contact heat transfer system between pentane and water was built, and the influence of the inlet flow rate of dispersed pentane, the temperature of water and the pore diameter of distributor on the volumetric heat transfer coefficient was investigated. Based on the heat transfer mechanism, the factors affecting the heat transfer performance of the direct contact heat exchanger are analyzed in detail, and compared with the heat exchanger with the filler, the enhancement effect of the filler on the heat transfer is studied.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ021.3

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