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
AbstractBy 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.
|Journal series||Acta Mechanica et Automatica, ISSN 1898-4088, e-ISSN 2300-5319, (N/A 40 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||digital camera data, two-phase flow, patterns identification, multiscale entropy, wavelets|
|License||Journal (articles only); author's final; ; with publication|
|Score|| = 14.0|
= 40.0, 28-02-2020, ArticleFromJournal
|Publication indicators||: 2018 = 0.615|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.