【作者】 李国能； 郑友取； 胡桂林；

【Author】 LI Guo-neng;ZHENG You-qu;HU Gui-lin;Zhejiang University of Science and Technology;

【机构】 浙江科技学院,新能源与节能技术研究所(筹)；

【摘要】 为了研究脉动流中发热圆柱体的对流传热特性,采用实验方法研究了不同雷诺数数(Re=71~282)和脉动频率(f=6~20 Hz)的脉动流对不同倾斜角度(0=0~90°)的发热圆柱体的对流传热特性。研究表明,相对努塞尔数随着倾斜角度的增大而增大,随着脉动频率的增大的降低。此外,在15 Hz左右存在一个临界脉动频率,当脉动频率低于临界脉动频率时,相对努塞尔数随着雷诺数的增大而降低,当脉动频率高于临界脉动频率时,相对努塞尔数随着雷诺数的增大而增大。更多还原

【Abstract】 In order to obtain the characteristics of the convection heat transfer of a heated cylinder in pulsating flows,experiments were carried out to study the influences of the Reynolds number(Re=71 —282),pulsating frequency(f=6 — 20 Hz) and the inclination angle(0=0—90°) on the convection heat transfer process of a heated cylinder in pulsating flows.The heat transfer enhancement factor was found to increase in trend with the inclination angle,and decrease with the pulsating frequency.In addition,acritical frequency about 15 Hz was observed,below which the heat transfer enhancement factor decreases in trend with the Reynolds number,but it increases in trend with the Reynolds number when the frequency is above the critical frequency.更多还原