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## Correction method of measurement volume effects on time-averaged statistics for laser Doppler velocimetry

European Journal of Mechanics B, Fluids, 91, p.233 - 243, 2022/01

被引用回数：1 パーセンタイル：23(Mechanics)

A new correction method of LDV (Laser Doppler Velocimetry) measurement volume effects on the time-averaged velocity statistics is proposed by considering the PDF (Probability Density Function) of streamwise fluctuating velocity and the streamwise cross-sectional area of the measurement volume. It is fundamentally different from the previous method using a laser intensity profile of LDV. We propose a simple equation to correct the measurement volume effects. Using this equation and calculating precisely both the measurement locations and the measurement volume, the correction of measurement volume effects on the time averaged statistics can be performed based on the LDV measurement data. From a comparison with correction method proposed by Durst et al. (1995), the present correction method provides almost same result with Durst method, and then the validity and applicability to higher Reynolds number or lower spatial conditions of two correction methods are confirmed.

## Turbulence intensity profile in high Reynolds number pipe flow

Proceedings of 11th International Symposium on Turbulence and Shear Flow Phenomena (TSFP-11) (Internet), 6 Pages, 2019/07

## A Correction method based on probability density function and measurement volume for turbulence intensity profile measured by LDV in turbulent pipe flow

Proceedings of 15th International Conference on Flow Dynamics (ICFD 2018) (USB Flash Drive), p.778 - 779, 2018/11

## Further experiments for mean velocity profile of pipe flow at high Reynolds number

Physics of Fluids, 30(5), p.055101_1 - 055101_7, 2018/05

被引用回数：16 パーセンタイル：73.54(Mechanics)

This paper reports further experimental results obtained in high Reynolds number actual flow facility in Japan. The experiments were performed in a pipe flow with water, and the friction Reynolds number was varied up to = 5.3 10. This high Reynolds number was achieved by using water as the working fluid and adopting a large-diameter pipe (387 mm) while controlling the flow rate and temperature with high accuracy and precision. The streamwise velocity was measured by laser Doppler velocimetry close to the wall, and the mean velocity profile, called log-law profile = (1/) ln(y) + , is especially focused. After careful verification of the mean velocity profiles in terms of the flow rate accuracy and an evaluation of the consistency of the present results with those from previously measurements in a smaller pipe (100 mm), it was found that the value of asymptotically approaches a constant value of = 0.384.

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