Periodic Trends in Two-Phase Flow Through a Vertical Minichannel: Wavelet and Multiscale Entropy Analyses Based on Digital Camera Data

Grzegorz Górski , Grzegorz Litak , Romuald Paweł Mosdorf , Andrzej Rysak

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.
Author Grzegorz Górski (FME / DMPE)
Grzegorz Górski,,
- Department of Material and Production Engineering
, Grzegorz Litak
Grzegorz Litak,,
-
, Romuald Paweł Mosdorf (FME / DMACS)
Romuald Paweł Mosdorf,,
- Department of Mechanics and Applied Computer Science
, Andrzej Rysak
Andrzej Rysak,,
-
Journal seriesActa Mechanica et Automatica, ISSN 1898-4088, e-ISSN 2300-5319, (N/A 40 pkt)
Issue year2019
Vol13
No1
Pages51-56
Publication size in sheets0.5
Keywords in Englishdigital camera data, two-phase flow, patterns identification, multiscale entropy, wavelets
ASJC Classification2207 Control and Systems Engineering; 2210 Mechanical Engineering
DOIDOI:10.2478/ama-2019-0008
URL http://www.acta.mechanica.pb.edu.pl/volume/vol13no1/08_2018_015_GORSKI_MOSDORF_LITAK_RYSAK.pdf
Internal identifier000045301
Languageen angielski
LicenseJournal (articles only); author's final; Other open licence; with publication
Score (nominal)40
Score sourcejournalList
ScoreBUT score = 14.0
Ministerial score = 40.0, 28-02-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 0.615
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