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Experiments in Fluids

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01-10-2009 | Research Article

Application of photobleaching molecular tagging velocimetry to turbulent bubbly flow in a square duct

Authors: Shigeo Hosokawa, Takayuki Fukunaga, Akio Tomiyama

Published in: Experiments in Fluids | Issue 4-5/2009

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Abstract

To evaluate turbulence energy budget in bubbly flows, an image processing method in a photobleaching molecular tagging velocimetry is improved for accurate evaluation of velocity gradients. Turbulence properties in single-phase and two-phase dilute-bubbly flows in a square duct are measured using the improved method. As a result, the following conclusions are obtained: (1) The axial velocity and axial turbulent intensity measured by the present method agree well with those measured by laser Doppler velocimetry not only for the single-phase flow but also for the dilute-bubbly flow. (2) The present method can measure velocity components and velocity gradients in the vicinity of the wall, and therefore the present method is of great use in understanding the mechanism of turbulence generation and dissipation near the wall. (3) The present method can provide detailed information on turbulence structure such as turbulence kinetic energy budget. (4) Bubbles tend to increase not only the turbulence production but also the turbulence dissipation.

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Title: Application of photobleaching molecular tagging velocimetry to turbulent bubbly flow in a square duct
Authors: Shigeo Hosokawa
Takayuki Fukunaga
Akio Tomiyama
Publication date: 01-10-2009
Publisher: Springer-Verlag
Published in: Experiments in Fluids / Issue 4-5/2009
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-009-0690-x

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