摘要
An experimental investigation of air flow and heat transfer in three types of converging-diverging tubes is presented in this study. They have the same diameter, rib height and pitch, but the different lengths of the converging and diverging sections and their joint ways. The experimental results indicate that the heat transfer is enhanced when the length of converging section increases. A 12.4% increase of Nusselt number is observed and a 6.8% increase of friction coefficient is seen for the developed tube jointed linearly (DTL).Also a 5.27% increase of Nusselt number is observed and a 46.5% increase of friction coefficient is seen for the developed tube jointed convexly (DTC). The comparison results of Webb’s method show the DTL is better than OT in the range 1.5×10 4～4×10 4, but the DTC is not better than it.
An experimental investigation of air flow and heat transfer in three types of converging-diverging tubes was presented in this study. They had the same diameter, rib height and pitch, but the different lengths of the converging and diverging sections and their joint ways. The experimental results indicated that the heat transfer was enhanced when the length of converging section increased. A 12.4% increase of Nusselt number was observed, and a 6.8% increase of friction coefficient was seen for the developed tube jointed linearly (DTL). Also a 5.27% increase of Nusselt number was observed and a 46.5% increase of friction coefficient was seen for the developed tube jointed convexly (DTC). The comparison results of Webb's method showed the DTL was better than OT in the range 1.5×104-4×104, but the DTC was not better than it.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2004年第9期1528-1531,共4页
CIESC Journal
基金
国家重点基础研究项目 (No G2 0 0 0 0 2 63 0 1)~~
关键词
缩放管
强化换热
摩擦阻力系数
Friction
Heat transfer
Nusselt number
Reynolds number
Schematic diagrams
Tubes (components)
