Study of interaction pattern between bubbles at three inline orifices in a submerged pool. (31st August 2017)

• Record Type: Journal Article
• Authors: Rana, Basanta Kumar; Das, Arup Kumar; Das, Prasanta Kumar
• Is Part Of: Chemical engineering science. Volume 168(2017)
• Page Start: 41
• Page End: 54
• Publication Date: 2017-08-31
• Subjects: Coalescence -- Bubble -- Submerged orifice -- Liquid drainage -- Gas interconnection -- Asymmetry; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2017.04.044
• Languages: English
• ISSNs: 0009-2509

Abstract

Highlights: We present interaction patterns of three inline bubbles. Three distinct patterns of bubble release dependent on mutual spacing are reported. Symmetric or asymmetric unifications are observed at similar or dissimilar spacing. Combinations of similar or dissimilar orifice diameters are tested. Drainage of liquid between bubbles and growth of gas interconnections are reported. Map of different zones of complete, partial and non-coalescence patterns are shown. Abstract: Experiments have been performed to study evolution and interaction of bubbles over three inline submerged orifices. Complete, partial and non-coalescence patterns are observed during the growth of bubbles at similar and dissimilar spacing and diameter of orifices. When orifices are equispaced and similar in size, symmetric interfacial shape is observed during coalescence, but unequal orifice spacing resulted in asymmetric merging of bubbles. Drainage of liquid before initiation of coalescence and growth of gaseous bridge between bubbles before unification are observed for both symmetric and asymmetric arrangements. Effect of gas flow rate has been observed for equal and unequal spacing. Delay in merge time is one of the important parameter which has been observed in case of unequal orifice spacing distances and its effect is analyzed for different air flow rate into the liquid tank. Scattered regime plot has been shown in order to understand the bubble coalescence and non-coalescence patterns in different zones and combinations of orifice sizes and orifices spacing.