文档介绍：三维翅片管外螺旋流动传热强化
张正国,余昭胜,方晓明,高学农
(华南理工大学传热强化与过程节能教育部重点实验室,广东广州510640)
摘要:流体在螺旋隔板换热器的壳程类似于塞状流流动,,,研究了润滑油在螺旋隔板单管换热器的壳程传热和压降性能,,并计算出各自的壳程传热系数,壳程传热系数相对误差为±3%,实验结果表明,在相同Reynolds数下,螺旋隔板花瓣管单管换热器的Nusselt数和压降△p分别是螺旋隔板光滑管单管换热器的2~~,螺旋隔板花瓣管单管换热器的传热性能的提高远高于压降的提高,证明在螺旋流条件下,花瓣管具有很好的传热强化性能.
关键词:花瓣管;螺旋隔板;传热强化
Heat transfer enhancement for helical flowing outside three-dimensional fin tube
ZHANG Zhengguo, YU Zhaosheng, FANG Xiaoming, GAO Xuenong
(Key Laboratory of Enhanced Heat fer and Energy Conservation, Ministry of Education, South China University of Technology, Guangzhou 510640, Guangdong, China)
Abstract: The flow pattern on the shell side of a helically baffled heat exchanger is near plug flow conditions, which almost eliminates backmixing and dead space on the shell side. The heat transfer coefficient of the helically baffled heat exchanger is much higher than that of conventional segmental baffle heat exchanger at the same pressure drop, In this paper, experiments were conducted for cooling water flowing in the tube side on the helically baffled heat exchanger with lubricating oil as the working medium flowing on the shell side. The tested tubes included one petal-shaped finned tube and one smooth tube elected for parisom The heat transfer coeffic