中国化学工程学报（英文版）
中國化學工程學報（英文版）
중국화학공정학보（영문판）
CHINESE JOURNAL OF CHEMICAL ENGINEERING
2007年
6期
814-820
,共7页
洪蒙纳%邓先和%黄阔%李志武
洪矇納%鄧先和%黃闊%李誌武
홍몽납%산선화%황활%리지무
compound heat transfer%spaced twisted-tape%converging-diverging tube%swirl flow
Pressure drop and compound heat transfer characteristics of a converging-diverging tube with evenly spaced twisted-tapes (CD-T tube) have been investigated experimentally. Swirl was generated by evenly spaced twisted-tape elements which vary in twist ratio and rotation angle. Space ratio also has an important effect on the characteristics. For comparison,experiments in a smooth circular tube and a converging-diverging (CD) tube without twisted-tapes were carried out. The results show that the twisted-tape with twist ratio y=4.72 and rotation angle θ=180° has the best performance among the four types of twisted-tapes presented in this paper. At Reynolds number ranging from 3400 to 20000,when space ratio s=48.6,the heat transfer efficiency index,which increases as the Reynolds number increases,is 0.85-1.21 and 1.07-1.15 compared to that of a smooth circular tube and a CD tube without twisted-tape inserts,respectively.
