摘要
在理论分析的基础上 ,采用计算机图像采集技术 ,实时记录气泡的长大过程 ,用图像分析技术确定气泡边缘形状 ,建立了根据气泡图像测定表面扩展黏度的实验装置 .直接测量动表面张力随时间的变化 ,并通过动表面张力与气泡表面积变化率的关系 ,确定溶液的表面扩展黏度 .测定了十二烷基硫酸钠溶液的表面扩展黏度 ,并与不同表面变形速率下的文献值进行比较 ,说明了表面活性剂溶液的表面流变现象 .
Based on the theoretical analysis on a growing bubble,a technique for measuring surface dilational viscosity is proposed. The growing process of the bubble is captured by videoimage technique. An edge-tracing algorithm using a local threshold and a method for profile optimization are used applied to determine the shape of the growing bubble. A device for measuring the dynamic surface tension from the profile of a growing bubble is set up,so that the dynamic surface tension can be determined directly as a function of time. The surface dilational viscosity of the solutions is determined through the rate of change of dynamic surface tension with respect to the rate of surface expansion. The surface dilational viscosity of sodium dodecyl sulfate (SDS) solution is measured. The data and those with different rates of surface deformation from the literature indicate that the surface exhibits surface reological property.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2000年第2期167-180,共14页
CIESC Journal
基金
国家自然科学基金!(No 2 95731 1 4 )
上海市自然科学基金!( 99ZF1 4 0 0 3)资助项目
关键词
表面扩展黏度
气泡长大法
表面活性剂
溶液
surface dilational viscosity,surface reology,growing bubble technique,dynamic surface tension
