caa a22 4500 606198199 CHVBK 20210128100932.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00348-015-1941-7 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1941-7 Investigation on liquid film of urea-water solutions with diode laser absorption spectroscopy [Elektronische Daten] [Huinan Yang, Xiaolong Guo, Wu Zhou, Benting Chen, Jiarui Hu, Mingxu Su, Xiaoshu Cai] 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 7187.50cm−1) was first validated using a calibration tool providing liquid film of urea-water solutions with known film thickness (100-1000μm) and mass fractions (5-50wt%), 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. Springer-Verlag Berlin Heidelberg, 2015 Yang Huinan School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut Guo Xiaolong School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut Zhou Wu School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut Chen Benting School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut Hu Jiarui School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut Su Mingxu School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut Cai Xiaoshu School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-7 0723-4864 56:4<1 2015 56 348 https://doi.org/10.1007/s00348-015-1941-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1941-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yang Huinan School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut NATIONALLICENCE 700 1- Guo Xiaolong School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut NATIONALLICENCE 700 1- Zhou Wu School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut NATIONALLICENCE 700 1- Chen Benting School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut NATIONALLICENCE 700 1- Hu Jiarui School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut NATIONALLICENCE 700 1- Su Mingxu School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut NATIONALLICENCE 700 1- Cai Xiaoshu School of Energy and Power Engineering, University of Shanghai for Science and Technology, No. 516, Jungong Road, Yangpu District, 200093, Shanghai, China aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-7 0723-4864 56:4<1 2015 56 348