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Multiphase Science and Technology
SJR: 0.153 SNIP: 0.222 CiteScore™: 0.26

ISSN Imprimir: 0276-1459
ISSN On-line: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v16.i4.40
pages 335-353

MOLECULAR TAGGING VELOCIMETRY BASED ON PHOTOBLEACHING REACTION AND ITS APPLICATION TO FLOWS AROUND SINGLE FLUID PARTICLES

Shigeo Hosokawa
Kobe University
Akio Tomiyama
Graduate School of Engineering, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe, 657-8501, Japan

RESUMO

Most of unintrusive velocimetry techniques utilize small tracer particles to visualize a flow field. The addition of tracer particles in flows induces errors and flow disturbance due to their poor followability and accumulation on gas-liquid interface. A molecular tagging velocimetry based on photobleaching reaction is developed in this study. The most significant features of the developed method are as follows: (a) local instantaneous velocity, strain rate and rotation are measurable, (b) the measurement can be performed at arbitrary points in a flow field, and (c) tracer particles disturbing a flow are not required. The method was applied to a laminar pipe flow and flows around a bubble and a drop. It is confirmed that (1) the method can accurately measure radial distributions of liquid velocity and shear stress in the pipe flow, (2) local instantaneous velocity distributions around single bubbles and a drop are successfully measured, (3) the time evolution of velocity field is measurable by forming multiple tags in a matrix arrangement, and (4) the liquid velocity in the vicinity of gas-liquid interface can be measured, provided that tags are formed there.