螺纹管内污垢热阻的对比实验研究  

EXPERIMENTAL RESEARCH ON THE FOULING RESISTENT OF INTERNAL HELICAL-RIB TUBES

作　　者：李蔚[1] 张巍[1] 李冠球[1] 张政江[1] 秦新安[2] 王铁坤[2] 徐志明[3] 

机构地区：[1]浙江大学机能学院,浙江杭州310027 [2]中国电子科技集团58研究所,江苏无锡214035 [3]东北电力大学能源与机械工程学院,吉林吉林132012

出　　处：《工程热物理学报》2009年第9期1578-1580,共3页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展规划基金项目(No.2007CB206904);国家高技术研究发展计划项目(No.2007AA05Z226)

摘　　要：本文对一冷却塔中的7根螺纹管进行了长时间污垢实验研究。螺纹管几何参数范围:螺纹数18～45,螺纹角25°～45°,螺纹高0.33～0.55mm。污垢是颗粒污垢和析晶污垢的混合物。本文基于普朗特类比,引入修正因子β(β=(A_w/A_(wp))/(A_c/A_(cp)),A_w为润湿面积,A_c为截面积,下标p表示光管),对半经验污垢预测模型进行修正,证明了螺纹管内参数对污垢热阻的形成影响很大,并建立了不同结构参数的螺纹管的统一结垢模型,对工程实际有一定指导意义。The experiments on fouling resistant of the seven different helical-rib tubes in cooling tower have been carried by us for a long time. The ranges of geometric parameters were number of rib starts （18～45）, helix angle （25～45 deg.）, and height （0.33～0.55 mm）. The fouling mechanism is a combination of precipitation fouling and particulate fouling. Based on the Prandtle analogy, β factor β（β（Aω/Aωp）/（Ac/Acp）,Aω is the wetted area, Ac is the cross section area, and the subscript p means the plain tube） was introduced to revise the semi-theoretical fouling model. The geometric parameters were proved to affect the fouling growing strongly. A new unified theoretical fouling correlation has been developed for all the tubes. The new correlation can be directly used to assess the fouling potential of enhanced tubes in actual cooling water situations.

关 键 词：污垢热阻 普朗特类比 强化传热 

分 类 号：TK172[动力工程及工程热物理—热能工程]