CAJ | 학술논문

为了研究扭曲管强化传热性能,通过建立模型数值模拟和实验研究相结合的方法对扭曲管及具有相同截面形状的普通椭圆管的传热性能进行了对比分析.研究了扭曲管和椭圆管管内流体努塞尔数Nu,压力降Δp和管内综合性能评价因子η随雷诺数Re的变化情况,在Re为800-2000时,扭曲管管内Nu是普通椭圆管的2-3倍,综合传热性能是椭圆管的1.5-2倍.得出了扭曲管可以很好地加剧管内流体湍流、强化管内传热,特别适用于管内流体在低雷诺数范围内的传热,是一种十分高效的强化传热管.
위료연구뉴곡관강화전열성능,통과건립모형수치모의화실험연구상결합적방법대뉴곡관급구유상동절면형상적보통타원관적전열성능진행료대비분석.연구료뉴곡관화타원관관내류체노새이수Nu,압력강Δp화관내종합성능평개인자η수뢰낙수Re적변화정황,재Re위800-2000시,뉴곡관관내Nu시보통타원관적2-3배,종합전열성능시타원관적1.5-2배.득출료뉴곡관가이흔호지가극관내류체단류、강화관내전열,특별괄용우관내류체재저뢰낙수범위내적전열,시일충십분고효적강화전열관.
The heat transfer performance of twisted tube was researched by numerical simulation and experimental research, and compared with that of normal elliptic tube with the same size. The change trend of Nusselt number (Nu), pressure drop Δp, the comprehensive function evaluation factor(η), and Reynolds number (Re) of inner-tube liquid was researched in twisted tube and elliptic tube. When the Re is between 800 and 2 000, the inner-tube liquid Nu of twisted tube is 2-3 times more than that of elliptic tube, and the heat transfer performance of twisted tube can be enhanced by 1.5-2 times that of elliptic tube. The results show that the twisted tube can greatly enhance the onflow and the heat transfer of tube-side liquid, which performs especially well when the Re of tube-side is small. The twisted tube is a high efficiency heat transfer tube.