摘要
1 引言 多组分相际传质的理论研究进展缓慢,由于实验技术的限制,现有的传质理论尚未得到验证,其微观机理尚不清楚,而深入研究多组分相际传质的关键问题是选择合适的浓度测量方法.目前,激光测温已普遍应用于各学科研究领域,但浓度场的测定尚限于浓度变化大且变化区域大的体系,文献报道最多的是扩散系数的测定.苗容生等利用显微激光全息干涉技术,成功地测出了湍流场中二元气液传质液相侧边界层内的浓度场变化.对于三元系统的测量,迄今未见文献报道,本文利用双波长激光显微全息干涉技术,对三元气液传质液相侧边界层内的浓度分布进行测量.
A micro - holographic interferometer of two - wavelength lasers has been designed and constructed. The concentration profiles close to the interface of liquid side were successfully measured for multicomponent gas - liquid mass transfer. It was discovered that the measured concentration at a distance 0. 01mm away from the interface was far from the thermodynamic equilibrium value, and thus a steep concentration gradient existed near the interface. The turbulent phenomena near the interface during interphase mass transfer were noted by experiment. The turbulent intensity and time were related to the composition and the components of the system to be studied, and also affected by the velocity of each phase. The concentration field near frontal interface was different from that of tail - vortex area for the mass transfer around a bubble.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1994年第5期636-641,共6页
CIESC Journal
基金
国家自然科学基金资助项目
关键词
传质
湍动现象
界面浓度分布
micro - holographic interferometer, turbulent phenomena near interface,concentration profile near interface
