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Session: Novel experimental measurement methods III
Session starts: Tuesday 04 November, 16:00
Presentation starts: 16:20
Room: Lecture room A

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Takuma Matsui ()
Kiyotaka Obunai ()
Shumpei Hara ()

Abstract:
Elastic Filament Velocimetry (EFV) is a flow measurement technique that detects fluid velocity by measuring the change in electrical resistance caused by axial deformation of a filament under fluid stress. In this study, we investigated the capability of EFV to measure both the mean velocity and turbulent fluctuations in low-speed airflow below 13 m/s. An EFV sensor using a platinum filament was fabricated, and wind tunnel experiments were conducted under 14 discrete flow conditions. The relationship between flow velocity and resistance was established using the measured data. The results confirmed that EFV can accurately capture changes in mean flow velocity even in the low-speed regime. However, in the measurement of turbulent fluctuations, the resistance signal was affected by external noise such as power supply interference and temperature variations, leading to an overestimation of turbulence intensity. Future improvements, including the use of thermally stable materials and enhanced noise reduction techniques, are expected to improve the accuracy of EFV in capturing true turbulence-induced velocity fluctuations.