摘要
以３０＃透平油为工质，对在光管内插入三种不同扭率扭带的受迫流动的冷、热态流阻及换热性能进行了实验。实验的雷诺数为２００～１１５０，普朗特数为３２０～５９０．实验结果表明：在本实验范围内，插有不同扭率的全长连续扭带管的换热系数为光管的１．７～２．６．倍，而阻力系数为光管的３～７．５倍；且扭率的大小对扭带的流阻与换热影响较大。另外，还对间断扭带管内油的受迫对流换热进行了实验。
Experimental study of forced convective heat transfer in tubes with twisted-tapeinserts is performed to in vestigate the characteristics of fluid fiow and heat transfer.The workingfiuiu is 30# turbine oil. The ranges of experimintal variables are 200<Re<1150 and 320<Pr<590.The experimental results stlow the influence of the tape twist ratio on flow resistance and heattransfer performance. A compared with smooth tube, heat transfer coefficient in tubes with fulllength twisted-tape inserts can be increased by 1.7～2.6times,and the resistance coefficent can beincreased by 3～7.5 times. In the meantime,the effect of regularly space twisted-tape inserts onflow resistance and heat transfer performance is investigated. Some correlationss derived from experi-ments provltie engineering design basis for high viscosity fluid heat exchangers.
出处
《重庆大学学报（自然科学版）》
CAS
CSCD
1995年第1期113-117,共5页
Journal of Chongqing University
关键词
扭带
强迫对流
高粘性流体
对流换热
twisted-tape inserts
forced convection
high viscosity fluid
experiment
