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Title of Journal: Exp Fluids

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Abbravation: Experiments in Fluids

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Springer-Verlag

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DOI

10.1007/s00592-015-0787-z

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1432-1114

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Planar fluorescence for round bubble imaging and i

Authors: Yerbol K Akhmetbekov Sergey V Alekseenko Vladimir M Dulin Dmitriy M Markovich Konstantin S Pervunin
Publish Date: 2010/01/01
Volume: 48, Issue: 4, Pages: 615-629
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Abstract

A correlationbased processing algorithm for bubble identification by a planar fluorescence for bubble imaging PFBI technique is presented in this paper The algorithm includes procedures to identify bubble positions and sizes as well as to track bubbles and correct bubble displacement vectors Moreover several schemes for calculation time optimisation were realised to achieve a reliable calculation time The developed algorithm identifies and tracks overlapping bubble images or images with nonuniform intensity distributions The employed correlation and iterative passing approach provides subpixel accuracy of bubble displacement estimation In addition the presented algorithm for bubble ring detection can be easily applied to shadow photography images of bubbles after the application of a derivative filter The PFBI technique combined with the particle image velocimetry and particle tracking velocimetry algorithms was applied for the experimental study of bubbly free jet twophase flows at Re = 12000 Four cases of volumetric gas content in the jet core were studied 0 12 24 and 42 with the same mean bubble diameter—085 mm The developed technique measures twodimensional distributions of instantaneous void fractions as well as both gaseous and liquidphase velocities Consequently the mean void fraction and velocity fields and a set of secondorder statistical moments were obtained including correlations of void fraction and velocity pulsations It was shown that the increase in volumetric gas content leads to the suppression of liquidphase velocity fluctuations in the jet mixing layer


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  1. Passive mixing control of plane parallel jets
  2. Imaging diffusion in a microfluidic device by third harmonic microscopy
  3. Two- and three-dimensional flows in nearly rectangular cavities driven by collinear motion of two facing walls
  4. Vortex dynamics and mass entrainment in turbulent lobed jets with and without lobe deflection angles
  5. Using stereo multigrid DPIV (SMDPIV) measurements to investigate the vortical skeleton behind a finite-span flapping wing
  6. Influence of a wavy boundary on turbulence.
  7. A novel data reduction technique for single slanted hot-wire measurements used to study incompressible compressor tip leakage flows
  8. Digital holography for micro-droplet diagnostics
  9. Kriging regression of PIV data using a local error estimate
  10. Active control of an axisymmetric jet with distributed electromagnetic flap actuators
  11. Experimental investigations on steady wake effects in a high-lift turbine cascade
  12. Simultaneous droplet and vapour-phase measurements in an evaporative spray by combined ILIDS and PLIF techniques
  13. Simultaneous droplet and vapour-phase measurements in an evaporative spray by combined ILIDS and PLIF techniques
  14. Experimental study of liquid–vapor phase distribution in a single tube capillary evaporator
  15. Analysis of the impact of impeller geometry on the turbulent statistics inside a fan-stirred, cylindrical flame speed vessel using PIV
  16. Detection of microorganismic flows by linear and nonlinear optical methods and automatic correction of erroneous images artefacts and moving boundaries in image generating methods by a neuronumerical hybrid implementing the Taylor’s hypothesis as a priori knowledge
  17. Hot-wire spatial resolution effects in measurements of grid-generated turbulence
  18. Effect of experimental parameters and image noise on the error levels in simultaneous velocity and temperature measurements using molecular tagging velocimetry/thermometry (MTV/T)
  19. Turbulence measurements in pipe flow using a nano-scale thermal anemometry probe
  20. The pinch-off process in a starting buoyant plume
  21. Defining the roughness sublayer and its turbulence statistics
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  24. Intermittent corner separation in a linear compressor cascade
  25. A novel architecture for a super-resolution PIV algorithm developed for the improvement of the resolution of large velocity gradient measurements
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  28. High-speed roll coating with complex rheology fluids
  29. Wing–vortex interaction: unraveling the flowfield of a hovering rotor
  30. Near-surface velocimetry using evanescent wave illumination
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  32. Characterizing the lower log region of the atmospheric surface layer via large-scale particle tracking velocimetry
  33. Development and characterization of high-frequency resonance-enhanced microjet actuators for control of high-speed jets
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  41. Polymer-induced turbulence modifications in an impinging jet
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