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Effect of measurement volume size on turbulent flow measurement using ultrasonic Doppler method

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Abstract

This paper presents the results of an investigation on the effects of measurement volume size on the mean velocity profile and the Reynolds stress for fully developed turbulent pipe flows. The study employs the ultrasonic velocity profile method, which is based on the ultrasonic Doppler method. The ultrasonic Doppler method offers many advantages over conventional methods for flow rate measurement in the nuclear power plant piping system. This method is capable of measuring the instantaneous velocity profile along the measuring line and is applicable for opaque liquids and opaque pipe wall materials. Furthermore, the method has the characteristic of being non-intrusive. Although it is applicable to various flow conditions, it requires a relatively large measurement volume. The measurement volume of the present method has a disk-shape determined by the effective diameter of the piezoelectric element and the number of the wave cycles of the ultrasonic pulse. Considering this disk-shaped measurement volume and expressing the time-averaged velocity in a truncated Taylor series expansion around the value at the center of the measuring control volume, the value of the velocity can be obtained. The results are then compared with the data obtained from DNS and LDA measurements. The result shows that the effect of the measurement volume size appears in the buffer region and viscous sublayer.

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Authors and Affiliations

  1. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguro-ku, 152-8550, Tokyo, Japan

    H. Kikura, G. Yamanaka & M. Aritomi

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  1. H. Kikura
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  2. G. Yamanaka
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  3. M. Aritomi
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Correspondence to H. Kikura.

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Kikura, H., Yamanaka, G. & Aritomi, M. Effect of measurement volume size on turbulent flow measurement using ultrasonic Doppler method. Exp Fluids 36, 187–196 (2004). https://doi.org/10.1007/s00348-003-0694-x

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  • DOI: https://doi.org/10.1007/s00348-003-0694-x

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