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Measurement of bubble velocity using spatial filter velocimetry

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Abstract

Spatial filter velocimetry (SFV) based on spatial filtering of time-series particle images proposed by Hosokawa and Tomiyama is applied to a bubble column to examine its applicability to bubble velocity measurement. The edge detection process is added in the SFV processing to reduce the size of image pattern and to obtain accurate velocity data. It is demonstrated that SFV is able to measure the bubble velocity in various spatial scales with the same accuracy as PTV. The measured mean bubble velocity does not depend on the interrogation size in the measurements. To the contrary, the standard deviation of measured bubble velocity becomes higher as the interrogation size decreases due to the superposition of interfacial wave velocity on the measured velocity. Simultaneous measurement of bubble and liquid velocities is also carried out for a planar bubble plume. The results clearly show that SFV can measure bubble and liquid velocities simultaneously.

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Abbreviations

d :

Diameter (m)

F SF :

Spatial filter function

I :

Intensity

I SF :

Integrated intensity

J :

Volumetric flux (m/s)

L :

Interrogation size (m)

l :

Wavelength of spatial filter (m)

N C :

Cycle number of spatial filter

t :

Time (s)

U :

Axial mean velocity (m/s)

u′:

Fluctuation component of axial velocity (m/s)

v :

Velocity (m/s)

x :

Coordinate in vertical direction (m)

y :

Coordinate in horizontal direction (m)

B:

Bubble

G:

Gas phase

L:

Liquid phase

max:

Maximum

x :

x direction

y :

y direction

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Acknowledgments

The authors gratefully acknowledge the support on the high-speed camera by Photron Ltd. This work has been partly supported by the Japan Society for the Promotion of Science (Grants-in-aid for scientific research (B) No. 24360070 and No. 25289033).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, Hyogo, 657-8501, Japan

    Shigeo Hosokawa, Takaaki Matsumoto & Akio Tomiyama

Authors
  1. Shigeo Hosokawa
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  2. Takaaki Matsumoto
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  3. Akio Tomiyama
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Corresponding author

Correspondence to Shigeo Hosokawa.

Additional information

This article is part of the Topical Collection on Application of Laser Techniques to Fluid Mechanics 2012.

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Hosokawa, S., Matsumoto, T. & Tomiyama, A. Measurement of bubble velocity using spatial filter velocimetry. Exp Fluids 54, 1538 (2013). https://doi.org/10.1007/s00348-013-1538-y

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  • DOI: https://doi.org/10.1007/s00348-013-1538-y

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