Multiphase Science and Technology A Quarterly

ISSN for PRINT: 0276-1459

For Online Access

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2004, Volume16

Issue 4

111 pages

DOI: 10.1615/MultScienTechn.v16.i4

Issue price - $140.00

Shigeo Hosokawa
Graduate School of Science and Technology, Kobe University Rokkodai, Nada, Kobe 657-8501, Japan

Akio Tomiyama
Graduate School of Science and Technology, Department of Mechanical Engineering, Faculty of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan

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.

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

Article price - $45.00

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