摘要
通过萘升华传质 /传热比拟实验 ,研究了涡产生器攻角θ、形状角 β及跨局Δy对顺排圆管管片式板芯传热特性的影响 .结果表明 ,涡产生器可显著改善圆管尾部回流区的换热 ;对给定的Re数 ,Nu数随攻角的增大而增大 ;适当减小形状角可以扩大涡旋的影响区域 ,从而使换热增强 ;当Re数较小时 ,适当减小跨距会更有效地改善圆管尾部回流区的换热 .
The effect of attack angle θ, shape angle β and span Δy of a vortex generator on the local heat transfer performance of in-line arranged round tube fin elements were studied with naphthalene sublimation mass/heat analogy experiment. The results showed that the heat transfer ability of the rear region was greatly increased by the vortex generator. For the given Re, Nu increased with the increase of attack angle and the decrease of shape angle. The swirl affecting region was enlarged with a smaller shape angle, so heat transfer was improved. For a smaller Re, heat transfer was greatly enhanced with a smaller span of the vortex generator.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2003年第3期294-298,共5页
CIESC Journal
基金
甘肃省自然科学基金资助项目 (No .ZR -96 -0 34) .~~
