Nonlinear dynamics of self-organising bubble departures from twin nozzles

Paweł Dzienis , Romuald Paweł Mosdorf , Tomasz Wyszkowski


The nonlinear dynamics of self-organising bubble departures from twin nozzles in engine oils was analysed. Air bubbles were generated from twin brass nozzles with an inner diameter equal to 1 mm. The flow of bubbles in bubble chains was recorded using high-speed camera. The time series of air pressure oscillations and signal from laser–phototransistor identifying the presence of bubbles over the nozzles outlet were recorded simultaneously. The self-organising bubble departures were observed and their stability was analysed. It was found that self-organising bubble departures become unstable because of successive (during subsequent bubble departures) decrease of the mean air pressure in one of the nozzle air supply system. It was shown that instability of selforganising bubble departures leads to equalization of pressures in both nozzles air supply systems which causes that simultaneous bubble departures appear. In the present experiment, this process was repeated in a cyclic and chaotic way. It was shown that stable selforganising bubble departures are accompanied by periodic air pressure oscillations in one of the nozzles and chaotic air pressure oscillations in the second one.
Author Paweł Dzienis (FME / DMACS)
Paweł Dzienis,,
- Department of Mechanics and Applied Computer Science
, Romuald Paweł Mosdorf (FME / DMACS)
Romuald Paweł Mosdorf,,
- Department of Mechanics and Applied Computer Science
, Tomasz Wyszkowski (FME)
Tomasz Wyszkowski,,
- Faculty of Mechanical Engineering
Journal seriesMeccanica, ISSN 0025-6455, e-ISSN 1572-9648, (N/A 100 pkt)
Issue year2019
Publication size in sheets0.55
Keywords in Englishbubble, bubble chain, self-organising, bubble departures, nonlinear data analysis
ASJC Classification2210 Mechanical Engineering; 2211 Mechanics of Materials; 3104 Condensed Matter Physics
Internal identifierROC 19-20
Languageen angielski
LicenseJournal (articles only); published final; Uznanie Autorstwa (CC-BY); with publication
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 17-02-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.201; WoS Impact Factor: 2018 = 2.316 (2) - 2018=2.208 (5)
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