Investigation on liquid film of urea–water solutions with diode laser absorption spectroscopy

被引:2
|
作者
Huinan Yang
Xiaolong Guo
Wu Zhou
Benting Chen
Jiarui Hu
Mingxu Su
Xiaoshu Cai
机构
[1] University of Shanghai for Science and Technology,School of Energy and Power Engineering
[2] University of Shanghai for Science and Technology,Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering
来源
Experiments in Fluids | 2015年 / 56卷
关键词
Film Thickness; Mass Fraction; Liquid Film; Selective Catalytic Reduction; Liquid Film Thickness;
D O I
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中图分类号
学科分类号
摘要
Measurement of multiparameter of liquid films (e.g., film thickness and concentration) is very important to understand the film formation processes in industrial applications. Here, a novel diode laser absorption spectroscopy (DLAS) sensor was developed to simultaneously measure the liquid film thickness and concentration of urea–water solutions by forming the transmittance ratio at two wavenumber positions. The performance of the sensor employed two diode lasers (6613.25 and 7187.50 cm−1) was first validated using a calibration tool providing liquid film of urea–water solutions with known film thickness (100–1000 μm) and mass fractions (5–50 wt%), and then, the sensor was applied to study a free-falling film of urea–water solutions on a vertical transparent quartz plate. Shadowgraph images were simultaneously taken as a means to obtain falling film thickness, and it was observed that measured film thickness was in good agreement with DLAS method and shadowgraph technique, and the deviation between these two techniques was 4.1 % when the falling film was stable.
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