摘要
以空气为介质 (Pr=0 6 98) ,通过数值模拟的方法在Re=30 0～ 80 0的范围内对含扭曲带管内周期性充分发展的层流流动进行了模拟分析 ,说明了不同Re、扭曲比y、纽带厚度δ和翅片系数Cfin对Nu、速度环量和阻力系数的影响 ,并通过对Nu和速度环量之间的关系进行了分析 ,得出在含扭曲带管内强化换热流动中决定换热能力的物理量———速度环量 .
The periodically fully developed laminar flow in a tube inserting a twisted-tape has been investigated by numerical analysis in the Reynolds number range of 300-800. A set of laminar flow predictions were presented to demonstrate the effects of the Reynolds number, twisted-ratio, tape thickness and the fin-parameter on the Nusselt number, velocity circulation and the friction factor. Comparing the Nusselt number and the velocity circulation, we found that the velocity circulation determined the heat transfer enhancement of a tube inserting a twisted-tape.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2004年第9期1422-1427,共6页
CIESC Journal
关键词
强化传热
扭曲带
数值分析
涡量
速度环量
Fins (heat exchange)
Flow of fluids
Laminar flow
Numerical analysis
Nusselt number
Reynolds number
Tapes
Tubes (components)
Velocity
