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Quantitative visualization study on diffusion of oxygen using UV-LED induced phosphorescence

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Abstract

The aims of this study are to visualize gas diffusion process between gas–liquid interface and measure a diffusion coefficient of dissolved oxygen in water by using a microscale UV-LED-induced phosphorescence method. The mass transfer between air and water was visualized qualitatively in a Y-shaped microchannel and the diffusion coefficient D L was measured quantitatively. Oxygen-sensitive phosphorescence dye (tris (2, 2′-bipyridine) ruthenium (II) chloride hexahydrate) and a 450 nm UV-LED were used for the optical measurement of a dissolved oxygen concentration (DOC) field. In-situ pixel-by-pixel calibration was carried out to obtain Stern–Volmer constant and phosphorescent intensity was converted to DOC field with a spatial resolution of 0.625 μm/pixel. Instantaneous dissolved oxygen concentration field and diffusion coefficient D L were successfully measured and compared to the theoretical prediction based on the one-dimensional Fick’s law. It was confirmed that the experimental results were in good agreement with the numerical prediction.

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Acknowledgments

This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20132020000390) and was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. NRF-2012R1A2A4A01008749 and No. 2013R1A1A2065648).

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Authors and Affiliations

  1. School of Mechanical Engineering, Pusan National University, Busan, 609-735, South Korea

    Jinkyu Kim, Kyung Chun Kim & Hyun Dong Kim

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  1. Jinkyu Kim
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  2. Kyung Chun Kim
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  3. Hyun Dong Kim
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Correspondence to Hyun Dong Kim.

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Kim, J., Kim, K.C. & Kim, H.D. Quantitative visualization study on diffusion of oxygen using UV-LED induced phosphorescence. J Vis 19, 591–601 (2016). https://doi.org/10.1007/s12650-016-0343-0

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  • DOI: https://doi.org/10.1007/s12650-016-0343-0

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