TY - JOUR
T1 - Combined particle image velocimetry of turbulence modification in a microbubble channel flow
AU - Kitagawa, Atsuhide
AU - Hishida, Koichi
AU - Kodama, Yoshiaki
PY - 2005/1
Y1 - 2005/1
N2 - The turbulence structure of flow field including microbubbles in a horizontal channel is experimentally investigated using an image processing technique in order to clarify the mechanism for drag reduction caused by microbubbles. A new system for the simultaneous measurement of liquid and dispersed gas phases is proposed, which is based on the combination of Particle Tracking Velocimetry, Laser Induced Fluorescence and Shadow Image Technique (PTV/LIF/SIT). To accurately detect the velocity vectors of the liquid phase in the two coexistent phases, the tracer particles overlapped with bubble shadow images are almost entirely eliminated in the post-processing stage. Finally, turbulence characteristics of the objective flow field are presented with the measurements for both phases obtained by the proposed system. The local interaction between bubbles and surrounding liquid is clarified.
AB - The turbulence structure of flow field including microbubbles in a horizontal channel is experimentally investigated using an image processing technique in order to clarify the mechanism for drag reduction caused by microbubbles. A new system for the simultaneous measurement of liquid and dispersed gas phases is proposed, which is based on the combination of Particle Tracking Velocimetry, Laser Induced Fluorescence and Shadow Image Technique (PTV/LIF/SIT). To accurately detect the velocity vectors of the liquid phase in the two coexistent phases, the tracer particles overlapped with bubble shadow images are almost entirely eliminated in the post-processing stage. Finally, turbulence characteristics of the objective flow field are presented with the measurements for both phases obtained by the proposed system. The local interaction between bubbles and surrounding liquid is clarified.
KW - Drag Reduction
KW - Laser Induced Fluorescence
KW - Microbubble Flow
KW - Particle Tracking Velocimetry
KW - Shadow Image Technique
KW - Turbulence Modification
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U2 - 10.1299/kikaib.71.44
DO - 10.1299/kikaib.71.44
M3 - Article
AN - SCOPUS:18344382766
SN - 0387-5016
VL - 71
SP - 44
EP - 51
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
IS - 701
ER -