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Research Papers

Development and Testing of a Multitransducer System for Measuring Height of Condensed Water in Steam Pipes With Steady-State and Turbulent Flow Conditions

[+] Author and Article Information
Shyh-Shiuh Lih

Jet Propulsion Laboratory,
California Institute of Technology,
4800 Oak Grove Drive,
Pasadena, CA 91109-8099
e-mail: lih@jpl.nasa.gov

Hyeong Jae Lee

Jet Propulsion Laboratory,
California Institute of Technology,
4800 Oak Grove Drive,
Pasadena, CA 91109-8099
e-mail: Hyeong.Jae.Lee@jpl.nasa.gov

Yoseph Bar-Cohen

Jet Propulsion Laboratory,
California Institute of Technology,
4800 Oak Grove Drive,
Pasadena, CA 91109-8099
e-mail: yoseph.bar-cohen@jpl.nasa.gov

Mircea Badescu

Jet Propulsion Laboratory,
California Institute of Technology,
4800 Oak Grove Drive,
Pasadena, CA 91109-8099
e-mail: mircea.badescu@jpl.nasa.gov

1Corresponding author.

Manuscript received August 22, 2017; final manuscript received April 25, 2018; published online May 28, 2018. Assoc. Editor: Fabrizio Ricci.The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States Government purposes.

ASME J Nondestructive Evaluation 1(3), 031008 (May 28, 2018) (7 pages) Paper No: NDE-17-1077; doi: 10.1115/1.4040112 History: Received August 22, 2017; Revised April 25, 2018

A system consisting of a multiplexer and multiple ultrasonic probes was developed for in situ monitoring of the water condensation height in steam pipes under steady-state and turbulent flow conditions. The measurement method, the signal processing techniques, the experimental setup, and the test results are presented in this paper. The feasibility and efficiency of the developed multitransducers and signal processing algorithms were demonstrated. The measured water height and wave pattern in dynamic surface conditions inside the pipe were verified through the snapshot of the recorded video images. The developed methodology built the framework for the use of multiple transducers array ultrasonic system for practical application to in situ monitor the water height in steam pipes.

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References

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Figures

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Fig. 1

Pulse-echo test method with multiple probes mounted onto the steam pipe

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Fig. 2

The experimental setup of the water flow system with a fan attached at the end of the pipe

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Fig. 3

Adjustable fixture for easy positioning to receive strong and consistent reflection signal amplitudes

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Fig. 4

Top: The time history of the measured signal. Bottom: The autocorrelation, Hilbert envelope of the autocorrelation function, and filtered Hilbert envelope of the autocorrelation function from the measured signal data.

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Fig. 5

Zoomed time zone of the bottom of Fig. 4 for the first wave group of the ultrasonic signal reflected from the pipe wall

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Fig. 6

The snap shot of the test examples: the steady-state flow (top) and the turbulent flow (bottom)

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Fig. 7

Measured height of water in each channel (top three plots) and the combination of all channels in a steady-state flow (bottom plot)

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Fig. 8

Measured height of water in each channel (top three plots) and the combination of all channels in a turbulent flow (the bottom plot; the solid line is the moving average)

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