脈動(dòng)熱管換熱器傳熱性能及工程應(yīng)用技術(shù)研究
發(fā)布時(shí)間：2018-08-03 15:56
【摘要】：隨著工業(yè)科技的發(fā)展,相關(guān)行業(yè)及工業(yè)領(lǐng)域熱設(shè)備工作的安全性及效率提高會(huì)面臨很多新問題。一方面,隨著集成度的提高,電子元器件尺寸越來越小,導(dǎo)致單位面積熱負(fù)荷越來越高,使得傳統(tǒng)散熱方式很難滿足要求;另一方面,隨著節(jié)能壓力的加大,低溫余熱回收的溫差越來越小,使得傳統(tǒng)換熱設(shè)備很難達(dá)到目的。因此,傳熱過程的強(qiáng)化以及新型高效換熱設(shè)備,越來越受到關(guān)注。脈動(dòng)熱管具有體積小、傳熱性能優(yōu)良等特點(diǎn)。本文針對(duì)脈動(dòng)熱管的傳熱性能,通過對(duì)脈動(dòng)熱管可視化實(shí)驗(yàn)觀測(cè)、氣-液脈動(dòng)熱管換熱裝置傳熱性能實(shí)驗(yàn)研究,進(jìn)而設(shè)計(jì)和開發(fā)了氣-液脈動(dòng)熱管換熱器�？梢暬瘜�(shí)驗(yàn)觀測(cè)方面:通過搭建可視化實(shí)驗(yàn)臺(tái),觀測(cè)不同充液率脈動(dòng)熱管的流向、流型以及氣泡的生長(zhǎng)和消失過程,進(jìn)而分析其傳熱性能。結(jié)論如下:(1)充液率影響脈動(dòng)熱管的正常啟動(dòng)及運(yùn)行。充液率為87.3%的脈動(dòng)熱管所需啟動(dòng)溫度較高,振蕩幅度穩(wěn)定但是較為緩弱;充液率為19.7%的脈動(dòng)熱管所需啟動(dòng)溫度較低,雖能正常啟動(dòng),但因充液率過低,難以形成循環(huán),不利于熱量傳輸;充液率為60.2%的脈動(dòng)熱管啟動(dòng)溫度在兩者之間,但振蕩幅度最劇烈。從振蕩幅度和啟動(dòng)溫度來看,更優(yōu)于充液率為47.5%的脈動(dòng)熱管。(2)從流型上來看,當(dāng)脈動(dòng)熱管加熱溫度較低時(shí),管內(nèi)以塞狀流為主;當(dāng)脈動(dòng)熱管達(dá)到相應(yīng)溫度時(shí),塞狀流會(huì)過渡到環(huán)狀流,管內(nèi)會(huì)以環(huán)狀流為主。傳熱性能實(shí)驗(yàn)研究方面:設(shè)計(jì)了由20根“U”形翅片管組成的氣-液脈動(dòng)熱管換熱實(shí)驗(yàn)裝置,并搭建了實(shí)驗(yàn)臺(tái),對(duì)其傳熱性能進(jìn)行了實(shí)驗(yàn)研究。結(jié)論如下:(1)熱源溫度對(duì)脈動(dòng)熱管工作性能影響較大。熱源溫度為45℃時(shí)開始啟動(dòng),溫度在60℃到80℃之間達(dá)到最佳運(yùn)行狀態(tài)。(2)實(shí)驗(yàn)結(jié)果分析表明:氣-液脈動(dòng)熱管換熱實(shí)驗(yàn)裝置的傳熱性能優(yōu)良,當(dāng)量導(dǎo)熱系數(shù)遠(yuǎn)遠(yuǎn)大于銅管。脈動(dòng)熱管換熱器設(shè)計(jì)方面:在氣-液脈動(dòng)熱管換熱裝置傳熱性能實(shí)驗(yàn)研究基礎(chǔ)上,設(shè)計(jì)和開發(fā)了由80根“U”形翅片管組成的氣-液脈動(dòng)熱管換熱器,并對(duì)其設(shè)計(jì)方法、設(shè)計(jì)思路、設(shè)計(jì)步驟以及相關(guān)問題進(jìn)行了闡述。
[Abstract]:With the development of industrial technology, the safety and efficiency of thermal equipment in related industries and industrial fields will face many new problems. On the one hand, with the increase of integration, the dimensions of electronic components become smaller and smaller, resulting in a higher heat load per unit area, which makes the traditional heat dissipation difficult to meet the requirements; on the other hand, with the increase of energy saving pressure, The temperature difference of low-temperature waste heat recovery is getting smaller and smaller, which makes the traditional heat exchanger difficult to achieve the purpose. Therefore, more and more attention has been paid to the enhancement of heat transfer process and new efficient heat transfer equipment. Pulsating heat pipe has the advantages of small volume and excellent heat transfer performance. In this paper, according to the heat transfer performance of pulsating heat pipe, the heat transfer performance of gas-liquid pulsating heat pipe heat exchanger is studied by visual experimental observation of pulsating heat pipe, and the gas-liquid pulsating heat pipe heat exchanger is designed and developed. Visual experimental observation: the flow direction, flow pattern, bubble growth and disappearance process of different liquid filling rate pulsating heat pipe were observed by building a visual experimental platform, and its heat transfer performance was analyzed. The conclusions are as follows: (1) the liquid filling rate affects the normal start-up and operation of the pulsating heat pipe. A pulsating heat pipe with a liquid filling rate of 87.3% requires a higher starting temperature, a stable oscillation amplitude but a relatively weak oscillation, and a low starting temperature for a pulse heat pipe with a liquid filling rate of 19.7%, although it can start normally, but it is difficult to form a cycle because of the low liquid filling rate. The starting temperature of the pulsating heat pipe with a liquid filling rate of 60.2% is between the two, but the amplitude of oscillation is the most intense. In terms of oscillation amplitude and starting temperature, it is better than the pulsating heat pipe with liquid filling rate of 47.5%. (2) from the flow pattern, when the heating temperature of the pulsating heat pipe is low, the plug flow is dominant in the tube, and when the pulsating heat pipe reaches the corresponding temperature, The plug flow will transition to the annular flow, and the annular flow will be dominant in the tube. Experimental research on heat transfer performance: an experimental apparatus of gas-liquid pulsating heat transfer pipe composed of 20 "U" finned tubes was designed, and an experimental bench was set up to study its heat transfer performance. The conclusions are as follows: (1) the temperature of heat source has great influence on the working performance of pulsating heat pipe. When the heat source temperature is 45 鈩，
本文編號(hào)：2162238
[Abstract]:With the development of industrial technology, the safety and efficiency of thermal equipment in related industries and industrial fields will face many new problems. On the one hand, with the increase of integration, the dimensions of electronic components become smaller and smaller, resulting in a higher heat load per unit area, which makes the traditional heat dissipation difficult to meet the requirements; on the other hand, with the increase of energy saving pressure, The temperature difference of low-temperature waste heat recovery is getting smaller and smaller, which makes the traditional heat exchanger difficult to achieve the purpose. Therefore, more and more attention has been paid to the enhancement of heat transfer process and new efficient heat transfer equipment. Pulsating heat pipe has the advantages of small volume and excellent heat transfer performance. In this paper, according to the heat transfer performance of pulsating heat pipe, the heat transfer performance of gas-liquid pulsating heat pipe heat exchanger is studied by visual experimental observation of pulsating heat pipe, and the gas-liquid pulsating heat pipe heat exchanger is designed and developed. Visual experimental observation: the flow direction, flow pattern, bubble growth and disappearance process of different liquid filling rate pulsating heat pipe were observed by building a visual experimental platform, and its heat transfer performance was analyzed. The conclusions are as follows: (1) the liquid filling rate affects the normal start-up and operation of the pulsating heat pipe. A pulsating heat pipe with a liquid filling rate of 87.3% requires a higher starting temperature, a stable oscillation amplitude but a relatively weak oscillation, and a low starting temperature for a pulse heat pipe with a liquid filling rate of 19.7%, although it can start normally, but it is difficult to form a cycle because of the low liquid filling rate. The starting temperature of the pulsating heat pipe with a liquid filling rate of 60.2% is between the two, but the amplitude of oscillation is the most intense. In terms of oscillation amplitude and starting temperature, it is better than the pulsating heat pipe with liquid filling rate of 47.5%. (2) from the flow pattern, when the heating temperature of the pulsating heat pipe is low, the plug flow is dominant in the tube, and when the pulsating heat pipe reaches the corresponding temperature, The plug flow will transition to the annular flow, and the annular flow will be dominant in the tube. Experimental research on heat transfer performance: an experimental apparatus of gas-liquid pulsating heat transfer pipe composed of 20 "U" finned tubes was designed, and an experimental bench was set up to study its heat transfer performance. The conclusions are as follows: (1) the temperature of heat source has great influence on the working performance of pulsating heat pipe. When the heat source temperature is 45 鈩，
本文編號(hào)：2162238
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