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Huge wave and drop entrainment mechanism in gas-liquid churn flow
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
2013 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 104, 638-646 p.Article in journal (Refereed) Published
Abstract [en]

A profound knowledge of huge wave and droplet entrainment mechanism is crucial for the thorough study on the gas-liquid churn flow. Although studies have shown that the entrained fraction is high in churn flow and reaches the minimum around the churn-annular transition, the underlying mechanism of the drop entrainment in churn flow is still not well explored. To address this, we investigated the properties of the huge waves and the droplet entrainment in two vertical pipes with the inner diameter of 19. mm and 34. mm under churn flow conditions. We found that the flooding of the film was a characteristic of the churn flow throughout the regime. In addition, increasing the gas or liquid flow rate could lead to the transition from churn flow to annular flow or reverse to slug flow, providing the insight into the differences among slug, churn and annular flow. We also discussed the film instability under different flow conditions and tried to reveal the physical mechanism based on the instability analysis. In our study, the bag breakup and the ligament breakup were observed to coexist. The analysis of the liquid distribution in the cross-section of the pipes not only revealed the variations of the entrained fraction of churn flow from that of annular flow, but also indirectly illustrated the differences between their breakup mechanisms. Moreover, the wave properties (amplitude and frequency) were also analyzed in detail.

Place, publisher, year, edition, pages
2013. Vol. 104, 638-646 p.
Keyword [en]
Churn flow, Entrainment, Flooding, Huge wave, Interface, Multiphase flow, Breakup mechanisms, Droplet entrainment, Entrained fractions, Instability analysis, Liquid distribution, Liquid flow rates, Physical mechanism, Air entrainment, Drops, Floods, Interfaces (materials), Oil well flooding, Liquids
National Category
Chemical Engineering
URN: urn:nbn:se:kth:diva-139149DOI: 10.1016/j.ces.2013.09.022ISI: 000327735900057ScopusID: 2-s2.0-84886287584OAI: diva2:684603

QC 20140108

Available from: 2014-01-08 Created: 2014-01-07 Last updated: 2014-01-23Bibliographically approved

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Ma, Weimin
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