文档介绍：中国工程热物理学会传热传质学
学术会议论文编号:123339
次声频脉动流横掠圆柱体传热实验研究
郑友取,李国能*,胡桂林,泮国荣
(浙江科技学院,浙江杭州 310023)
(*Tel: **********, Email: gnlene@)
摘要:为研究次声频(0-20Hz)脉动波对圆柱体对流换热的特性,搭建了脉动流强化传热实验台架,研究了不同脉动频率(f=6-20 Hz)脉动流横掠圆柱体的对流换热问题,脉动波的有效压力振幅prms固定为22 Pa。结果表明:低频小振幅的脉动流横掠热圆柱体时,对流换热相对努塞尔数随着频率的降低线性增大,;辐射热流率占总热流率的比例随着频率的降低而指数增加。
关键词:对流传热;脉动流;次声频;圆柱体;
Experimental study on heat transfer of a cylinder in the pulsating cross-flows with infrasonic frequency
Zheng Youqu, Li Guoneng*, Hu Guilin, Pan Guorong
(Zhejiang University of Science and Technology, Hangzhou 310023, China)
(*Tel: **********, Email: gnlene@)
Abstract: In order to study the characteristics of convection heat transfer of a cylinder in pulsating flows with infrasonic frequency, an experiment setup was built. Convection heat transfer of a cylinder in the pulsating cross-flows was investigated under different pulsating frequency (f=4-20 Hz) while the effective pressure amplitude maintains at 22 Pa. Results found that the relative Nusselt number decreases linearly with the pulsating frequency, and could reach a value larger than . In addition, the ratio of radiative heat flux to the total heat flux decreases exponentially with pulsating frequency.
Keywords: convection heat transfer; pulsating flow; infrasonic frequency; cylinder
0 前言
换热器是能源、化工、机械和制冷等工业部门的一种重要设备,提高换热器的换热系数直接影响到各个工业部门的设备能耗和低品位热能的回收程度,是低碳能源技术的一个重要方面,具有深远的工