Effect of operation regime on bubble size and void fraction in a bubble column with porous sparger

Mohagheghian, Shahrouz; Ghajar, Afshin J.; Elbing, Brian R.

doi:10.22541/au.158446787.71423634

Cited by 1 publication

(4 citation statements)

References 34 publications

(63 reference statements)

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“…The viscosity of the fluid does not seem to have an influence [61], whereas Mohagheghian et al [62] reported an influence in high viscosity systems as the rising velocity of bubbles decreases, which increases the likelihood of coalescence. A higher surface tension is advantageous for coalescence, thus it destabilizes the homogenous regime [61].…”

Section: Bubble Generation From Porous Plugsmentioning

confidence: 95%

“…The transition between the homogeneous and heterogeneous regime has been studied by Kazakis et al [61] and Mohagheghian et al [62]. In addition, the influence of numerous parameters on the transition between these regimes was discussed in the review by Besagni et al [3].…”

Section: Bubble Generation From Porous Plugsmentioning

confidence: 99%

“…For slightly higher flow rates, which still belong to the homogeneous regime, the bubble size increases proportionally to the flow rate. An empirical correlation for the whole homogenous regime was derived by Mohagheghian et al [62]:…”

Section: Bubble Generation From Porous Plugsmentioning

confidence: 99%

“…In this regime, the bubble size is mainly determined by coalescence and breakup, which is influenced by many different parameters [3]. For the heterogenous regime, Mohagheghian et al [62] argued that the Ohnesorg number, Oh, is a function of the Morton and the Capillary number, Ca:…”

Section: Bubble Generation From Porous Plugsmentioning

confidence: 99%

See 3 more Smart Citations

A Review of Bubble Dynamics in Liquid Metals

Haas¹,

Schubert²,

Eickhoff³

et al. 2021

Metals

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Gas bubbles are of major importance in most metallurgical processes. They promote chemical reactions, homogenize the melt, or float inclusions. Thus, their dynamics are of crucial interest for the optimization of metallurgical processes. In this work, the state of knowledge of bubble dynamics at the bubble scale in liquid metals is reviewed. Measurement methods, with emphasis on liquid metals, are presented, and difficulties and shortcomings are analyzed. The bubble formation mechanism at nozzles and purging plugs is discussed. The uncertainty regarding the prediction of the bubble size distribution in real processes is demonstrated using the example of the steel casting ladle. Finally, the state of knowledge on bubble deformation and interfacial forces is summarized and the scalability of existing correlations to liquid metals is critically discussed. It is shown that the dynamics of bubbles, especially in liquid metals, are far from understood. While the drag force can be predicted reasonably well, there are large uncertainties regarding the bubble size distribution, deformation, and lift force. In particular, the influence of contaminants, which cannot yet be quantified in real processes, complicates the discussion and the comparability of experimental measurements. Further open questions are discussed and possible solutions are proposed.

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Section: Bubble Generation From Porous Plugsmentioning

confidence: 95%