摘要
采用Mach-Zehnder干涉法测量液相互扩散系数有利于对扩散机理进行进一步分析。对于黏度值较小的溶液,人工充注溶液时容易引起扰流,由此会导致浓度场产生混乱,进而使得数据处理发生畸变。设计的溶液自动充注装置采用步进电机驱动注射器,能有效改善对溶液充注速度的控制,明显提升实验的成功率和测量精度。此外,引入了带自动捕捉功能的矩形窗函数,将图像处理所需的时间大致由25 min缩短至5 min。最后,利用改进的实验系统测量了0.33 mol/L的氯化钾水溶液的互扩散系数,所得实验结果与文献值相比具有良好的一致性,二者的相对偏差绝对平均值为0.58%。
Using Mach-Zehnder interferometry method to measure the mutual diffusion coefficient can contribute to further analysis for diffusion mechanism. For the solution with a small viscosity value, artificial injection is easy to cause turbulence, resulting in chaos in the concentration field and distortion of data processing. The automatic injection device using the injector with stepping motor was designed, which could effectively improve the control of the solution filling speed, and obviously improve the success rate and measuring precision of the experiments. In addition, this work introduced the rectangle window function with automatic capture function, which greatly reduced the time required for image processing from about 25 minutes to 5 minutes. Finally, the improved experiment system was used to measure the mutual diffusion coefficient of KCl aqueous solution at a molar concentration of 0.33 mol/L, which had good consistency with the literature data with an absolute mean of relative deviation of 0.58%.
作者
张颖
占涛涛
陈俊帅
何欣欣
何茂刚
ZHANG Ying;ZHAN Taotao;CHEN Junshuai;HE Xinxin;HE Maogang(Key Laboratory of Thermo-Fluid Science and Engineering,Ministry of Education,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《热科学与技术》
CAS
CSCD
北大核心
2020年第1期1-6,共6页
Journal of Thermal Science and Technology
基金
国家自然科学基金资助项目(51576161)。
关键词
互扩散系数
光干涉法
自动充注
图像处理
mutual diffusion coefficient
optical interferometry
automatic injection
image processing
