During severe accidents in a nuclear power plant, in-vessel cooling may be required to mitigate the risk of vessel failure in the event of core meltdown and subsequent corium contamination. This cooling technique, known as in-vessel retention (IVR), entails flooding the reactor cavity with water. If the temperatures are sufficiently high, IVR may cause downward facing boiling (DFB) on the outer surface of the reactor pressure vessel (RPV), which gives rise to two-phase thermal-hydraulic phenomena. The regimes in DFB may range from film boiling to nucleate boiling, where the efficiency of cooling varies immensely between these two. In the DFB geometry under consideration (i.e., a hemispherical vessel), the collected signals/images are heavily contaminated by unavoidable noise and spurious disturbances, which hinder the extraction of pertinent information, such as film thickness and the boiling cycle. This paper proposes a wavelet-based filtering of sensor measurements for denoising of the nonstationary signals with the future objective of estimating the thickness of vapor films in real time, as needed for process monitoring and control. The proposed concept has been validated with experimental data recorded from a pool boiling apparatus for physics-based understanding of the associated phenomena.
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July 2018
Technical Briefs
Analysis of Filtered Thermal-Fluid Video Data From Downward Facing Boiling Experiments
Chi-Shih Jao,
Chi-Shih Jao
Department of Electrical Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: cxj36@psu.edu
Pennsylvania State University,
University Park, PA 16802
e-mail: cxj36@psu.edu
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Faith R. Beck,
Faith R. Beck
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: frb115@psu.edu
Pennsylvania State University,
University Park, PA 16802
e-mail: frb115@psu.edu
Search for other works by this author on:
Fan-Bill Cheung,
Fan-Bill Cheung
Fellow ASME
Department of Mechanical and
Nuclear Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: fxc46@psu.edu
Department of Mechanical and
Nuclear Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: fxc46@psu.edu
Search for other works by this author on:
Asok Ray
Asok Ray
Fellow ASME
Department of Mechanical and
Nuclear Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: axr2@psu.edu
Department of Mechanical and
Nuclear Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: axr2@psu.edu
Search for other works by this author on:
Chi-Shih Jao
Department of Electrical Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: cxj36@psu.edu
Pennsylvania State University,
University Park, PA 16802
e-mail: cxj36@psu.edu
Faith R. Beck
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: frb115@psu.edu
Pennsylvania State University,
University Park, PA 16802
e-mail: frb115@psu.edu
Nurali Virani
Fan-Bill Cheung
Fellow ASME
Department of Mechanical and
Nuclear Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: fxc46@psu.edu
Department of Mechanical and
Nuclear Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: fxc46@psu.edu
Asok Ray
Fellow ASME
Department of Mechanical and
Nuclear Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: axr2@psu.edu
Department of Mechanical and
Nuclear Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: axr2@psu.edu
1Corresponding author.
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT,AND CONTROL. Manuscript received October 5, 2017; final manuscript received February 16, 2018; published online March 27, 2018. Assoc. Editor: Sergey Nersesov.
J. Dyn. Sys., Meas., Control. Jul 2018, 140(7): 074502 (7 pages)
Published Online: March 27, 2018
Article history
Received:
October 5, 2017
Revised:
February 16, 2018
Citation
Jao, C., Beck, F. R., Virani, N., Cheung, F., and Ray, A. (March 27, 2018). "Analysis of Filtered Thermal-Fluid Video Data From Downward Facing Boiling Experiments." ASME. J. Dyn. Sys., Meas., Control. July 2018; 140(7): 074502. https://doi.org/10.1115/1.4039470
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