Research Group

Laboratory setup for planar laser induced fluorescence of a bubble plume.

Dong-Guan Seol

Ph.D. Student. Started, September, 2004. Graduated May, 2008.

Dong-Guan Seol is funded by the U.S. NSF through the Turbulent Mixing in Multiphase Plumes project. He developed new methods for multiphase particle image velocimetry (PIV) and planar laser induced fluorescence (LIF). The PIV methods utilize vector post-processing techniques to separate bubble velocity vectors from a mixed-phase PIV vector map. The method is much simpler than traditional methods requiring fluorescent tracer particles or sophisticated image processing techniques and can be implemented using standard PIV software such as DaVis by LaVision. The LIF methods account for laser attenuation through the bubbly-region of the flow and apply image processing techniques to remove bubbles and bubble shadows from the raw images before processing to obtain concentrations. Our results show that laser reflection and dispersion from the bubbles are confined to regions in the beam path downstream of the bubbles, and introduce a very low-level noise in the shadow region of the image.

Publications

  • Seol, D.-G., Bryant, D. B. & Socolofsky, S. A., "Measurement of behavioral properties of entrained ambient water in a stratified bubble plume,'' Journal of Hydraulic Engineering, in press.
  • Bryant, D. B., Seol, D.-G. & Socolofsky, S. A. (2009), "Quantification of turbulence properties in bubble plumes using vortex identification methods,"' Phys. Fluids, 21, 075101, doi: 10.1063/1.317646.
  • Seol, D.-G. & Socolofsky, S. A. (2008), "Vector post-processing algorithm for phase discrimination of two-phase PIV," Exp. Fluids, 45:2, 223-239.
  • Socolofsky, S. A., Bhaumik, T. & Seol, D.-G. (2008), "Double-plume
    integral models for near-field mixing in multiphase plumes," J. Hydraulic
    Eng., 134:6, 772-783.
  • Seol, D.-G., Bhaumik, T., Bergmann, C., and Socolofsky, S. A. (2007). "Particle image velocimetry measurements of the mean flow characteristics in a bubble plume." Journal of Engineering Mechanics, 133(6), 665-676.
  • Seol, D.-G., and Socolofsky, S. A. (2007). "Vector post-processing algorithm for phase discrimination of two-phase PIV." Experiments in Fluids, in review (submitted March 2007, preparing second revision).