Development of Measurement Method for Free Surface Flow using Laser Tagging Method by Photochromic Dye

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560183
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Gunma University
• Principal Investigator: AMAGAI Kenji 群馬大学, 大学院理工学府, 教授 (20221731)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 熱流体工学 / レーザー計測 / 界面流動 / 自由表面流れ

Outline of Final Research Achievements

In this study, the laser tagging method by photochromic dye was developed for the study of free surface flow behavior. Flow characteristics of liquid sheet jet and surface flow on an inclined wall were investigated. Pulses of UV light (wavelength, λ= 355nm) by a Nd:YAG laser were used in order to form the photochromic dye traces. Liquid velocity was measured from the movement of dye traces. Moreover, by forming a set of 4-points of dye traces on the liquid sheet, normal strain, shear strain and rotational motions were estimated from change of relative positions of the dye traces. Liquid surface velocity and wave velocity for falling liquid films on inclined wall were simultaneously measured by the laser tagging method. As the result, it was confirmed that the liquid film moved in almost constant velocity before approaching the surface wave. When the wave was passing over the liquid film, the liquid film velocity rapidly increased.

Free Research Field

熱流体工学