Comparison between Numerical and Experimental for UVP Measurement in Double Bent Pipe with Out-of-Plane Angle

Nobuyoshi Tsuzuki, Treenuson Weerachon, Hiroshige Kikura

Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo, Japan.

DOI: 10.4236/jfcmv.2014.24017                

Abstract

Twin vortices flow behavior with out-of-plane angle effect in double bent pipe system is studied numerically and experimentally. Double bent pipe system generates very complicated flow behavior including twin vortices in the downstream of the double bent. Moreover, angle from the plane of the double bent forms more complicated flow behavior due to the flow twist by out-of-plane angle. In this study, numerical analysis is examined for this double bent system using three-dimensional CFD code, FLUENT, to reproduce those complicated flow behaviors with twin vortices. Numerical results are compared with experimental results obtained by Ultrasonic Velocity Profiler (UVP). Discrepancy between numerical and experimental result is discussed changing out-of- plane angle, α. Velocity profiles obtained by numerical results are converted into UVP profiles, and they are compared with the experimental results by UVP. Consequently, velocity behavior especially around the pipe wall obtained by numerical results is agreed with experimental results.

Keywords

Double Bent Pipe, Twin Vortices, Vorticity, Comparison, Experimental, Numerical, CFD

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Mattingly, G.E. and Yeh, T.T. (1991) Effect of Pipe Elbows and Tube Bundles on Selected Types of Flowmeters. Flow measurement and Instruments, 2, 4-13. http://dx.doi.org/10.1016/0955-5986(91)90050-2
[2]	Takeda, Y. (1995) Velocity Profile Measurement by Ultrasonic Doppler Method. Experimental Thermal and Fluid Science, 10, 444-453. http://dx.doi.org/10.1016/0894-1777(94)00124-Q
[3]	Takeda, Y., Furuichi, N., Mori, M., Aritomi, M. and Kikura, H. (2000) Development of a New Flow Metering System Using UVP. Preliminary Performance Assessments Using NIST flow Standards. ASME Fluids Engineering Division Summer Meeting.
[4]	Mori, M., Takeda, Y., Taishi, T., Furuichi, N., Aritomi, M. and Kikura, H. (2002) Development of a Novel Flow Meter System Using Ultrasonic Velocity Profile Measurement. Experiments in Fluids, 32, 153-160.
[5]	Wada, S., Kikura, H., Aritomi, M., Mori, M. and Takeda, Y. (2004) Student Program—Development of Pulse Ultrasonic Doppler Method for Flow Rate Measurement in Power Plant Multilines Flow Rate Measurement on Metal Pipe. Journal of Nuclear Science and Technology, 41, 339-346. http://dx.doi.org/10.1080/18811248.2004.9715493
[6]	Treenuson, W., Tsuzuki, N., Kikura, H., Aritomi, M., Wada, S. and Tezuka, K. (2013) Accurate Flowrate Measurement on the Double Bent Pipe Using Ultrasonic Velocity Profile Method. The Japanese Society for Experimental Mechanics, 13, 200-211.
[7]	Treenuson, W., Tsuzuki, N., Kikura, H. and Wada, S. (2014) Effect of Out-of-Plane Double Bent Pipe on Ultrasonic Flow Metering. Proceedings of SPIE, to be published.
[8]	Yuki, K., Hasegawa, S., Sato, T., Hashizume, H., Aizawa, K. and Yamano H. (2011) Matched Refractive-Index PIV Visualization of Complex Flow Structure in a Three-dimensionally Connected Dual Elbow. Nuclear Engineering and Design, 241, 4544-4550. http://dx.doi.org/10.1016/j.nucengdes.2010.12.026
[9]	Yuki, K., Hasegawa, S., Sato, T., Hashizume, H., Aizawa, K. and Yamano, H. (2009) Unsteady Hydraulic Characteristics in Large-diameter Pipings with Elbow for JSFR. 3. Flow Structure in a 3-dimensionally Connected Dual Elbow Simulating Cold-Leg Piping in JSFR. Proceedings of 13th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-13).
[10]	Takeda, Y. (2012) Ultrasonic Doppler Velocity Profiler for Fluid Flow. Springer, Japan. http://dx.doi.org/10.1007/978-4-431-54026-7
[11]	NIST (2010) Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties—REFPROP ver 9.0.NIST, US.