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Experimental study of turbulent bubbly jet. Part 1. Simultaneous measurement of three-dimensional velocity fields of bubbles and water

Published online by Cambridge University Press:  04 May 2022

Dong Kim Open the ORCID record for Dong Kim [Opens in a new window] ,
Daniel Schanz Open the ORCID record for Daniel Schanz [Opens in a new window] ,
Matteo Novara Open the ORCID record for Matteo Novara [Opens in a new window] ,
Hyunduk Seo Open the ORCID record for Hyunduk Seo [Opens in a new window] ,
Youngwoo Kim ,
Andreas Schröder Open the ORCID record for Andreas Schröder [Opens in a new window]  and
Kyung Chun Kim Open the ORCID record for Kyung Chun Kim [Opens in a new window]
Dong Kim
Affiliation:
School of Mechanical Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
Daniel Schanz
Affiliation:
Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), 37073 Göttingen, Germany
Matteo Novara
Affiliation:
Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), 37073 Göttingen, Germany
Hyunduk Seo
Affiliation:
School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea
Youngwoo Kim
Affiliation:
School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea
Andreas Schröder
Affiliation:
Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), 37073 Göttingen, Germany
Kyung Chun Kim*
Affiliation:
School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea
*
†Email address for correspondence: kckim@pusan.ac.kr
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Abstract

This study proposes a method for simultaneous measurements of time-resolved three-dimensional velocity fields of the dispersed and continuous phases of a turbulent bubbly jet at a low void fraction using Lagrangian particle tracking (LPT) velocimetry with the Shake-The-Box algorithm. Four high-speed cameras are used to acquire time series of images that include both bubbles and fluid tracer particles. Bubbles are firstly tracked using intensity differences between tracer particles and bubbles, then the bubble images are removed from the camera images and all tracer particles are tracked using the residual images. Subsequently, FlowFit interpolation is applied to the LPT results obtained by phase separation to investigate flow characteristics of a bubbly jet. The bubbly jet was divided into two regions along the vertical direction: jet-like and plume-like regions. Streamwise vortex structures of continuous phase were generated mainly by the rising bubbles. The Gaussian and top-hat velocity profiles matched well with the ensemble-averaged fluid and bubble velocities, respectively. The measured slip velocity in the radial direction was not constant but linearly increased. The classical assumption of self-similarity with Gaussian profiles for fluid velocity and bubble concentration is experimentally verified. The fluid volume flux and entrainment coefficient are obtained as a function of the slip velocity, void fraction, plume and bubble width based on three-dimensional measurements. We found that the classical integral theory agrees well with experiments in the plume region.

JFM classification

Multiphase and Particle-laden Flows: Gas/liquid flow Wakes/Jets: Jets Convection: Plumes/thermals
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 941 , 25 June 2022 , A42
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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References

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Kim et al. Supplementary Movie 1

Lagrangian bubble-particle tracking and phase separation results.

Download Kim et al. Supplementary Movie 1(Video)
Video 18.4 MB

Kim et al. Supplementary Movie 2

Instantaneous velocity field of bubble and liquid phase by FlowFit interpolation.

Download Kim et al. Supplementary Movie 2(Video)
Video 13.9 MB