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Pattern recognition algorithm for analysis of chugging direct contact condensation

Hujala, Elina; Tanskanen, Vesa; Hyvärinen, Juhani (2018)

Katso/Avaa
Hujala_et_al_Pattern_recognition_final_draft.pdf (22.13Mb)
Lataukset: 


Post-print / Final draft

Hujala, Elina
Tanskanen, Vesa
Hyvärinen, Juhani
2018

Nuclear Engineering and Design

332

June 2018

202-212

Elsevier

School of Energy Systems

https://doi.org/10.1016/j.nucengdes.2018.03.032
Näytä kaikki kuvailutiedot
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2018092736727

Tiivistelmä

Direct contact condensation of steam bubbles in a boiling water reactor suppression pool has long been studied utilizing video recording of experiments. The use of video recording enables observation of the behaviour of the bubble surface area and can assist in validation of computational fluid dynamics models.

A direct contact condensation experiment of the suppression pool test facility PPOOLEX was recorded using high-speed cameras. The recorded video material was used for development of a pattern recognition and data analysis algorithm. 300 fps video of 48 s duration was cut into frames with a resolution of 768 px x 768 px. The side profile of the bubbles was identified and the volumes and surface areas of the bubbles were evaluated using a voxel-based method.

The purpose of the algorithm was to determine the shape and size of steam bubbles during their formation, expansion, collapse and re-formation. The most probabilistic chugging frequencies were estimated. The bubble geometry data were also used to determine the velocity and acceleration of the phase interface, as condensation induced Rayleigh-Taylor instability develops on the bubble surface during the bubble collapse, as the heavy phase accelerates towards the light phase. Knowledge of the critical wave length is necessary for mesh spacing in CFD calculations.

The algorithm appears to be promising. Some limitations exist and approximations need to be made due to the challenging video shooting conditions. The algorithm works well for cylindrical bubbles and provides important data on the dynamics of the phase interface necessary for numerical modelling of direct contact condensation.

Lähdeviite

Hujala, E., Tanskanen, V., Hyvärinen, J. (2018). Pattern Recognition Algorithm for Analysis of Chugging Direct Contact Condensation. Nuclear Engineering and Design, Vol 332, Issue June 2018. p. 202-212. DOI: 10.1016/j.nucengdes.2018.03.032

Alkuperäinen verkko-osoite

https://www.sciencedirect.com/science/article/pii/S0029549318303315?via%3Dihub
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