Introducing the Planar Laser-Induced Fluorescence Technique (PLIF) to Measure Mixing Time in Gas-Stirred Ladles

Abstract

The planar laser-induced fluorescence (PLIF) technique was implemented to measure mixing time in a 1/17 water model of a 200-ton ladle furnace. The results were compared to those obtained using the conventional method of pH probes. PLIF determinations were done at two different planes, and pH probe determinations were performed at two different locations. The results suggest that mixing times measured by PLIF are similar to those obtained under optimal conditions by the pH probe and that PLIF technique is more accurate and less sensitive to the location of the measurement than the pH probe method. In addition, the particle image velocimetry (PIV) technique was used to measure the effect of the immersed probe on the fluid-dynamic structure of the system. The presence of the probe affects greatly fluid dynamics and consequently the mixing behavior, which could explain the differences found in its mixing time measurements at different probe locations. This study shows the feasibility of the PLIF technique used to measure mixing time in physical models of gas-stirred ladles; it is not intrusive and allows the visualization of the mixing phenomena in a complete plane of the system.

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Acknowledgments

The authors thank DGAPA-UNAM for the financial support through the Project IN115619. Luis Enrique Jardón-Pérez, CVU 624968, as a student registered in the Doctoral Program in Chemical Engineering at the Universidad Nacional Autónoma de México (UNAM), thanks CONACYT for the financial support through a Ph.D. scholarship.

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Correspondence to Marco A. Ramírez-Argáez.

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Manuscript submitted February 26, 2019.

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Jardón-Pérez, L.E., Amaro-Villeda, A., González-Rivera, C. et al. Introducing the Planar Laser-Induced Fluorescence Technique (PLIF) to Measure Mixing Time in Gas-Stirred Ladles. Metall Mater Trans B 50, 2121–2133 (2019). https://doi.org/10.1007/s11663-019-01631-y

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