摘要
用极限扩散电流技术(LDCT)对竖直管内的液体单相流与气液两相流的传质特性进行了测量,经三传类比由测量结果获得了传热特性.实验在一内径为18 mm的垂直有机玻璃管内进行,实验液体为K3F e(CN)6-K4F e(CN)6-N aOH溶液,气体为空气.实验结果与D ittus-Boe lter式的计算值及两相流传热的文献值吻合较好.实验中对气液两相流瞬时极限电流信号进行了测量与分析,采用小波分析法对瞬时极限电流波动信号进行了6尺度分解与重构,深入认识了气液两相流的传递过程.对上升管中气弹运动对传热传质的影响提出了假设.
The characteristics of mass and heat transfer of single liquid phase and gas-liquid two-phase flow in a vertical tube were studied with limiting diffusion current technique （LDCT） and the theory of heat and mass transfer analogue. Experiments were carried out in a vertical plexiglass tube of inner diameter of 18 mm. The working liquid was an aqueous solution of K3Fe（CN）6-K4Fe（CN）6-NaOH. Air was the working gas. The measurements on heat transfer coefficients with LDCT agree well with Dittus-Boeher correlation and references on gas-liquid two-phase heat transfer. The signal fluctuation of limiting diffusion current in gas-liquid two-phase flow was analyzed by wavelet theory with 6-level analysis and reconfiguration to investigate the instantaneous and local characteristics of the process. The influence of Taylor bubble movement on heat mass transfer was assumed based on the above analyses.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2005年第6期797-801,共5页
Journal of Dalian University of Technology
关键词
极限扩散电流技术
气-液弹状流
传递
小波分析
limiting diffusion current technique（LDCT）
gas-liquid slug flow
transfer
wavelet analysis
