本文選題：組合扭帶 + 強化傳熱�。� 參考：《廣西大學(xué)》2015年碩士論文

【摘要】：換熱器是工業(yè)傳熱的關(guān)鍵設(shè)備,應(yīng)用強化傳熱技術(shù)改善其傳熱性能是節(jié)能環(huán)保的有效途徑。換熱管內(nèi)插入自旋扭帶不僅可以強化管內(nèi)傳熱,而且具有在線防垢的作用。本文以水為介質(zhì),對換熱管內(nèi)插入組合扭帶的強化傳熱進行了實驗與數(shù)值模擬研究,并與開孔扭帶和空管作對比分析。實驗結(jié)果表明：內(nèi)插入組合扭帶管的壓力降、傳熱系數(shù)和努塞爾數(shù)都得到了提高。其中,壓力降扭帶管比空管提高了23.2%～37.9%；傳熱系數(shù)扭帶管比空管平均提高了16.39%～38.88%,組合扭帶管比開孔扭帶管平均提高了19.49%；努塞爾數(shù)扭帶管比空管平均提高了13.01%～20.38%,組合扭帶管比開孔扭帶平均提高了6.52%。換熱管內(nèi)插入組合扭帶的傳熱綜合性能評價因子Φ都大于1,Φ值最高達到1.16,有效地實現(xiàn)了傳熱強化。數(shù)值模擬結(jié)果表明：組合扭帶管內(nèi)的流體為三維螺旋軌跡流動,邊界層流體速度大于空管和開孔扭帶管,且邊界層速度比空管平均提高了5.03%16.68%,比開孔扭帶管平均提高了1.20%～3.37%,減薄了管內(nèi)流體邊界層厚度。組合扭帶管內(nèi)流體的三維螺旋流動、二次流以及邊界層速度的提高是換熱管傳熱強化的主要原因。組合扭帶管的傳熱系數(shù)隨著扭帶寬度、扭率和錯開率的減小而增大,內(nèi)表面?zhèn)鳠嵯禂?shù)變化總體呈現(xiàn)由進口到出口的不斷減小趨勢。換熱管管壁的溫度分布隨管壁半徑呈對數(shù)形式分布,且溫度大小由外向內(nèi)逐級遞減。
[Abstract]:Heat exchanger is the key equipment for industrial heat transfer. It is an effective way to save energy and protect environment by applying enhanced heat transfer technology to improve its heat transfer performance. The insertion of spin-torsion band in the heat transfer tube can not only enhance the heat transfer in the tube, but also have the effect of on-line anti-scaling. In this paper, the experimental and numerical simulation of heat transfer enhancement by inserting a combined torsion band into a heat exchanger pipe is carried out in water medium, and the results are compared with that of an open-hole torsional belt and an empty tube. The experimental results show that the pressure drop, heat transfer coefficient and Nusselle number of the intercalated combined torsion tube are improved. The heat transfer coefficient of the tube is increased by 16.39 and 38.88 than that of the empty tube, and the average increase of the combined tube is 19.49 compared with that of the open-hole torsion tube, and the pressure drop tube is 23.2and 37.9m higher than that of the empty tube, and the heat transfer coefficient of the tube is increased by 16.39 and 38.88, and the average value of the combined tube is 19.49. The average value of the Nussel number torsion tube is 13.01% and 20.38% higher than that of the empty tube, and the combined torsion band tube is 6.52% higher than the open-hole torsion band. The comprehensive heat transfer performance evaluation factor 桅 is greater than 1, and the maximum value of 桅 is 1.16, which can effectively realize heat transfer enhancement. The numerical simulation results show that the fluid in the combined torsion tube is a three-dimensional spiral trajectory flow, and the velocity of the boundary layer fluid is larger than that of the empty tube and the open-hole torsion tube. The velocity of the boundary layer is 5.03 / 68 higher than that of the empty tube and 1.20 / 3.37, respectively, and the thickness of the fluid boundary layer in the pipe is reduced. The three dimensional helical flow secondary flow and the increase of boundary layer velocity are the main reasons for the heat transfer enhancement of the combined torsional tube. The heat transfer coefficient of the combined torsion tube increases with the decrease of the width of the torsion belt, the torsion ratio and the staggered opening rate, and the variation of the heat transfer coefficient of the inner surface presents a decreasing trend from the inlet to the outlet. The temperature distribution of the heat transfer tube wall is logarithmic with the radius of the tube wall, and the temperature decreases progressively from outside to inside.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ051.5

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