单波长溶液液膜厚度测量方法

发布时间：2018-06-30 02:43

  本文选题：溶液液膜 + 测量　； 参考：《中南大学学报(自然科学版)》2016年01期

【摘要】：提出基于朗伯-比尔定律的未知质量分数尿素水溶液液膜厚度测量方法,选取尿素水溶液吸收率对质量分数的变化率为0的波数位置(6 613.25 cm~(-1)),研制单波长半导体激光吸收光谱(DLAS)尿素水溶液液膜厚度测量系统。通过溶液液膜厚度可调(0~1 mm)的标准具对该方法测量精度进行验证。利用研制的单波长DLAS液膜测量系统对常温下水平透明石英玻璃板上的尿素水溶液液膜蒸发过程进行研究。研究结果表明:尿素水溶液液膜厚度测量平均相对误差约为1.50%,3次重复性实验厚度标准偏差小于24.68μm。在液膜蒸发初期,液膜厚度随时间的变化率很大;在蒸发阶段中期,液膜蒸发速率趋于稳定;但在蒸发阶段后期,剧烈的光束转向现象造成了强烈的数据波动。
[Abstract]:A method for measuring the liquid film thickness of urea aqueous solution with unknown mass fraction based on Lambert-Beer 's law is presented. A single wavelength semiconductor laser absorption spectroscopy (DLAS) measuring system for measuring the liquid film thickness of urea aqueous solution was developed at the wavelength position of 6 613.25 cm ~ (-1), in which the absorptivity of urea aqueous solution changed to 0 by mass fraction. The accuracy of the method is verified by a standard tool with adjustable liquid film thickness (0 ~ 1 mm). A single wavelength DLAS liquid film measurement system was developed to study the evaporation process of urea aqueous solution film on a horizontal transparent quartz glass plate at room temperature. The results show that the average relative error of measuring the thickness of urea aqueous solution liquid membrane is about 1.50 and 3 times repeatable experiment thickness standard deviation is less than 24.68 渭 m. In the early stage of liquid film evaporation, the thickness of liquid film varies greatly with time; in the middle stage of evaporation, the evaporation rate of liquid film tends to be stable; but in the late stage of evaporation, the intense light beam turning phenomenon results in strong data fluctuation.
【作者单位】： 上海理工大学能源与动力工程学院上海市动力工程多相流动与传热重点实验室;
【基金】：国家自然科学基金资助项目(51306123) 博士点基金联合资助课题(20133120120008)~~
【分类号】：TQ441.41;O645.1
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本文编号：2084501