Technical Brief

Analysis of Filtered Thermal-Fluid Video Data From Downward Facing Boiling Experiments

[+] Author and Article Information
Chi-Shih Jao

Department of Electrical Engineering,
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

Nurali Virani

General Electric Global Research Center,
Niskayuna, NY 12309
e-mail: nurali.virani88@gmail.com

Fan-Bill Cheung

Fellow ASME
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

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 140(7), 074502 (Mar 27, 2018) (7 pages) Paper No: DS-17-1506; doi: 10.1115/1.4039470 History: Received October 05, 2017; Revised February 16, 2018

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.

Copyright © 2018 by ASME
Your Session has timed out. Please sign back in to continue.


Rouge, S. , 1997, “ Sultan Test Facility for Large-Scale Vessel Coolability in Natural Convection at Low Pressure,” Nucl. Eng. Des., 169(1–3), pp. 185–195. [CrossRef]
Chu, T. , Bainbridge, B. , Simpson, R. , and Bentz, J. , 1997, “ Ex-Vessel Boiling Experiments: Laboratory- and Reactor-Scale Testing of the Flooded Cavity Concept for In-Vessel Core Retention—Part I: Observation of Quenching of Downward-Facing Surfaces,” Nucl. Eng. Des., 169(1–3), pp. 77–88. [CrossRef]
Brusstar, M. , Merte, H. , Keller, R. , and Kirby, B. , 1997, “ Effects of Heater Surface Orientation on the Critical Heat Flux—I: An Experimental Evaluation of Models for Subcooled Pool Boiling,” Int. J. Heat Mass Transfer, 40(17), pp. 4007–4019. [CrossRef]
Sohag, F. , Beck, F. , Mohanta, L. , Cheung, F. , Segall, A. E. , Eden, T. , and Potter, J. , 2017, “ Enhancement of Downward-Facing Saturated Boiling Heat Transfer by the Cold Spray Technique,” Nucl. Eng. Technol., 49(1), pp. 113–122. [CrossRef]
Sohag, F. , Beck, F. , Mohanta, L. , Cheung, F. , Segall, A. , Eden, T. , and Potter, J. , 2017, “ Effects of Subcooling on Downward Facing Boiling Heat Transfer With Micro-Porous Coating Formed by Cold Spray Technique,” Int. J. Heat Mass Transfer, 106, pp. 767–780. [CrossRef]
Mallat, S. , 2009, A Wavelet Tour of Signal Processing, 3rd ed., Academic Press, Amsterdam, The Netherlands.
De Kerpel, K. , De Schampheleire, S. , De Keulenaer, T. , and De Paepe, M. , 2015, “ Two-Phase Flow Regime Assignment Based on Wavelet Features of a Capacitance Signal,” Int. J. Heat Fluid Flow, 56, pp. 317–323. [CrossRef]
Nguen, V. T. , Euh, D. J. , and Song, C.-H. , 2010, “ An Application of the Wavelet Analysis Technique for the Objective Discrimination of Two-Phase Flow Patterns,” Int. J. Multiphase Flow, 36(9), pp. 755–768. [CrossRef]
Marr, D. , and Hildreth, E. , 1980, “ Theory of Edge Detection,” Proc. R. Soc. London B: Biol. Sci., 207(1167), pp. 187–217. [CrossRef]
Beck, F. , Virani, N. , Mohanta, L. , Sohag, F. , Ray, A. , and Cheung, F. , 2017, “ An Image Processing Technique for the Study of Vapor Film Dynamics During Quenching of a Downward Facing Hemisphere,” 16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH), Xian, China, Sept. 3–8.
Mohanta, L. , Cheung, F. , and Bajorek, S. , 2016, “ Stability of Coaxial Jets Confined in a Tube With Heat and Mass Transfer,” Physica A, 443, pp. 333–346. [CrossRef]


Grahic Jump Location
Fig. 1

The pool boiling apparatus: (a) schematic diagram of the experimental apparatus and (b) measurement angles ϕ

Grahic Jump Location
Fig. 2

(a) Raw and detected edge images, (b) geometry of the vessel for vapor film extraction, and (c) schematic of IA vibration

Grahic Jump Location
Fig. 3

Profiles of vapor film thickness estimation at 97 °C bath temperature. The thick vertical lines indicate the time epoch (i.e., 9.2 s) at which the signal behavior changes significantly.

Grahic Jump Location
Fig. 4

Multiresolution analysis of signals in the first 6000 frames. The Wavelet basis db45 has been used for MRA: (a) ϕ = 42 deg, (b) ϕ = 28 deg, (c) ϕ = 14 deg, and (d) ϕ = 0 deg.

Grahic Jump Location
Fig. 5

Schematic representation of the recursive filtering process

Grahic Jump Location
Fig. 6

Profile of a typical IA signal

Grahic Jump Location
Fig. 7

Filtered signals of vapor film thickness. The thick vertical lines in the two bottom plots indicate the time of thermocouple quench.

Grahic Jump Location
Fig. 8

Filtered signals (ϕ = 28 deg) at different bath temperatures



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In