Journal of Fluid Science and Technology
Online ISSN : 1880-5558
ISSN-L : 1880-5558
Papers
Concentration measurement in a planar liquid jet with a chemical reaction by using the improved concentration measurement system based on the light absorption spectrometric method
Takahiro NAITOTomoaki WATANABEYasuhiko SAKAIKouji NAGATAYasumasa ITO
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2014 Volume 9 Issue 3 Pages JFST0041

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Abstract

We improve a spatial resolution of concentration measurement system based on the light absorption spectrometric method, which is used to measure instantaneous concentrations of multiple absorptive species. Light-emitting diodes (LEDs), which have a higher light intensity than a halogen lamp used in the former concentration measurement system, are used as light sources of the new concentration measurement system. We also develop a new optical fiber probe with a higher spatial resolution than the former one. The diameter of the optical fiber bundle and the length of the sampling volume of the new optical fiber probe are 0.1 mm and 0.5 mm, respectively. The sampling volume of the new optical fiber probe is 35 times smaller than that of the former one. In a turbulent planar liquid jet with a second-order chemical reaction A + B → R, concentrations of all reactive species are measured by using the new concentration measurement system, and we validate the new concentration measurement system by comparing the measurement results obtained by the new system with those obtained by the former system. The results show that the mean concentrations of reactive species measured by the new system are consistent with those measured by the former system. The power spectra of concentration fluctuations of reactive species show that the new system is able to measure the concentration fluctuations up to higher frequency ranges than the former system.

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© 2014 by The Japan Society of Mechanical Engineers
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