RESEARCH PAPER
Periodic Trends in Two-Phase Flow Through a Vertical Minichannel: Wavelet and Multiscale Entropy Analyses Based on Digital Camera Data
1
Faculty of Mechanical Engineering, Bialystok University of Technology, ul. Wiejska 45C, 15-351, Bialystok, Poland
2
Faculty of Mechanical Engineering, Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland
3
Department of Process Control, AGH University of Science and Technology, ul. Mickiewicza 30, 30-059 Krakow, Poland
Submission date: 2018-03-24
Acceptance date: 2019-03-21
Online publication date: 2019-04-18
Publication date: 2019-03-01
Acta Mechanica et Automatica 2019;13(1):51-56
KEYWORDS
ABSTRACT
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.
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| eISSN: | 2300-5319 |
| ISSN: | 1898-4088 |
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