中低频声波强化对流换热试验研究  

Experimental study on enhanced convective heat transfer by medium-low frequency sound waves

作　　者：杨延锋 姜根山[2] 李颢 YANG Yanfeng;JIANG Genshan;LI Hao(School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China;School of Mathematics and Physics,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206 [2]华北电力大学数理学院,北京102206

出　　处：《中南大学学报（自然科学版）》2022年第7期2407-2415,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(12074118);河北省自然基金资助项目(A2019502160);中国科学院声学研究所声场声信息国家重点实验室资助项目(SKLA201808)。

摘　　要：为研究中低频声波作用下热铜球的对流换热特性,搭建声波强化传热实验台架,研究在声频率f为200~500 Hz、声压级Lp为133 dB的声波作用下不同直径(直径d为10,15和20 mm)热铜球的对流换热问题。研究结果表明:当声频率f为200~500 Hz时,随着声频率增大,不同直径加热铜球的对流换热系数h都呈先减小后增加的变化规律。当f=200 Hz时,相对于自然对流换热,铜球的传热效果分别提升77%(d=10 mm),60%(d=15 mm)和50%(d=20 mm)。存在某一特定声频率f_(p)使铜球的对流换热系数h出现最小值。直径为15 mm和20 mm的热铜球在特定频率f_(p)的声波作用下出现传热恶化现象。传热恶化现象的发生与声波参数和铜球的结构参数相关。To study the convective heat transfer characteristics of hot copper spheres under the action of mediumlow frequency sound waves,an experimental bench for acoustic wave enhancement of heat transfer was set up.The convective heat transfer of hot copper spheres with different diameters(10,15 and 20 mm)under the action of sound waves with sound frequency of 200~500 Hz and sound pressure level of 133 dB was studied.The results show that in the sound frequency range of the experiment,the convective heat transfer coefficient h of copper spheres with different diameters decreases firstly and then increases with the increase of sound frequency.When f=200 Hz,compared with natural convection heat transfer,the heat transfer effect of copper spheres is enhanced by 77%(d=10 mm),60%(d=15 mm)and 50%(d=20 mm),respectively.There is a specific sound frequency f_(p) which makes the convective heat transfer coefficient h of the heated copper sphere reach the minimum value.The heat transfer of hot copper spheres with diameters of 15 mm and 20 mm deteriorates under the action of sound wave at the sound frequency of f_(p).The deterioration of heat transfer is related to the sound wave parameter and the structure of the copper sphere.

关 键 词：中低频 声波 对流换热 传热恶化 

分 类 号：TK124[动力工程及工程热物理—工程热物理]