Periodic trends in two-phase flow through a vertical minichannel: wavelet and multiscale entropy analyses based on digital camera data

• Autorzy: Górski Grzegorz , Mosdorf Romuald , Rysak Andrzej , Litak Grzegorz

Identyfikatory

DOI

10.2478/ama-2019-0008

• Języki publikacji: EN

Abstrakty

EN

By changing the air and water flow relative rates in the two-phase (air-water) flow through a minichannel, we observe aggregation and partitioning of air bubbles and slugs of different sizes. An air bubble arrangement, which show non-periodic and periodic patterns. The spatiotemporal behaviour was recorded by a digital camera. Multiscale entropy analysis is a method of measuring the time series complexity. The main aim of the paper was testing the possibility of implementation of multiscale entropy for two-phase flow patterns classification. For better understanding, the dynamics of the two-phase flow patterns inside the minichannel histograms and wavelet methods were also used. In particular, we found a clear distinction between bubbles and slugs formations in terms of multiscale entropy. On the other hand, the intermediate region was effected by appearance of both forms in non-periodic and periodic sequences. The preliminary results were confirmed by using histograms and wavelets.

Słowa kluczowe

EN

digital camera data; two-phase flow; pattern identification; multiscale entropy; wavelets

• Wydawca: Oficyna Wydawnicza Politechniki Białostockiej
• Czasopismo: Acta Mechanica et Automatica
• Rocznik: 2019
• Tom: Vol. 13, no. 1
• Strony: 51--56
• Opis fizyczny: Bibliogr. 34 poz., rys., wykr.

Twórcy

autor

Górski Grzegorz

• Faculty of Mechanical Engineering, Bialystok University of Technology, ul. Wiejska 45C, 15-351 , Bialystok, Poland

autor

Mosdorf Romuald

• Faculty of Mechanical Engineering, Bialystok University of Technology, ul. Wiejska 45C, 15-351 , Bialystok, Poland

autor

Rysak Andrzej

• Faculty of Mechanical Engineering, Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland

autor

Litak Grzegorz

• Faculty of Mechanical Engineering, Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland
• Department of Process Control, AGH University of Science and Technology, ul. Mickiewicza 30, 30-059 Krakow, Poland

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Uwagi

Acknowledgments: The presented research was funded by the National Science Centre, Poland – the number of decision UMO.2017/27/ B/ST8/02905.

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).