Abstract
In the paper the formation of bubble chains over two nozzles has been experimentally investigated and modelled. Bubbles were generated from twin brass nozzles (with the inner diameter equal to 1 mm) to distilled water. The appearance and disappearance of alterative bubble departures have been investigated. It has been found that during disappearance of alternative bubble departures bubbles depart from nozzle outlets simultaneously. The PIV method was used to reconstruct the liquid velocity field around the bubble chains. The results of experiment were comparing with results of numerical simulation in which the Level Set method has been used. The PIV method show that during the alternate bubble departures the range of the velocity field formed by the bubble chain is smaller than in case when bubbles depart in non-alternative way. In this case the bubbles velocity above the nozzles outlet is greater in comparison with bubble velocity during the simultaneously bubble departures. The numerical simulations show that in alternative bubble departures bubble just after its departure is attracted to the common bubble chain. The hydrodynamic interactions between departing bubbles lead to uniform distribution of bubbles in bubble chain.
Highlights
The understanding of mechanisms associated with bubbles flow, bubble chains formation and bubbles interactions plays a major role in liquid mass transfer process [1]
The air volume flow rate was measured using by flow meters - MEDSON s.c Sho-Rate-Europe Rev D, P10412A
During the alternative bubble departures the liquid flow generated by common bubble chain start just above nozzles outlet
Summary
The understanding of mechanisms associated with bubbles flow, bubble chains formation and bubbles interactions plays a major role in liquid mass transfer process [1]. Hydrodynamic interactions between bubbles caused coalescence or bouncing of departing bubbles [3, 4, 5, 6]. Bouncing and coalescence of a pair bubbles generated from orifice and rising side by side, was investigated in the paper [4]. During the alternative bubble departures, bubble hydrodynamic interaction causes the formation of unique structure of bubbles flow above nozzle outlets [7]. In present paper the liquid flow above nozzles during the appearance and disappearance of alternative bubbles departures have been investigated. The Level Set and PIV method were used to determine to liquid flow above the nozzle during appearance and disappearance of alternative bubble departures
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