SHI Jianwei, WU Wei, YANG Huinan, et al. Measurement of multi-parameter of liquid film for urea-water-solutions with laser absorption spectroscopy[J]. CIESC Journal, 2017, (1): 79-86.
SHI Jianwei, WU Wei, YANG Huinan, et al. Measurement of multi-parameter of liquid film for urea-water-solutions with laser absorption spectroscopy[J]. CIESC Journal, 2017, (1): 79-86.DOI: 10.11949/j.issn.0438-1157.20160913.
quantitative analysis of multi-parameter of liquid film(film thickness
temperature and mass fraction) for urea-water-solutions is crucial to control the formation of liquid film
improve the efficiency of SCR system and reduce the NOx emissions.A new method based on Beer-Lambert law was developed to simultaneously measure the thickness and mass fraction of liquid film for urea-water-solutions at constant temperature
and the thickness and temperature at constant mass fraction by combining two different wavelengths
1420 nm and 1488 nm
respectively.Furthermore
measurement accuracy of this method was validated by a calibration tool which provided liquid film with known film thickness
temperature and mass fraction
respectively.It was found that the averaged deviation of film thickness and mass fraction measured simultaneously at constant temperature was 0.82% and 3.93%
respectively.It also revealed that the mean deviation of film thickness and temperature measured simultaneously at constant mass fraction was 0.79% and 2.58%