Experimental characterization of dynamic behavior of single bubble breakage in an agitated tank

Hasan, Basim O.; Hamad, Muayad F.; Majdi, Hasan Sh.; Hathal, Mustafa M.

doi:10.1016/j.euromechflu.2020.11.001

Cited by 3 publications

(5 citation statements)

References 44 publications

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“…As shown in Figure 8, when N increases, the percent of binary breakage (PBB) of bubble or drop decreases while the percent of multiple breakage (PMB, including ternary, quaternary and higher‐order breakages) increases. The results are similarity with some existing experimental studies 48–50 . Note that the mean sizes of bubble and drop are not identical but very close (the average deviation is no more than 0.10 mm, similarly hereinafter) at each given N .…”

Section: Resultssupporting

confidence: 90%

“…Figure 11 shows the effects of N and d 0 on breakage probabilities of bubble and drop. It can be seen that the breakage probability of bubble or drop quickly increases with increasing N or d 0 , which is consistent with the experimental finding in the literature 30,31,48–51 . This is because the larger d 0 may cause the weaker stability stress to resist the external destructive stress inflicted by turbulent eddy.…”

Section: Resultssupporting

confidence: 90%

“…The results are similarity with some existing experimental studies. [48][49][50] Note that the mean sizes of bubble and drop are not identical but very close (the average deviation is no more than 0.10 mm, similarly hereinafter) at each given N. The larger N may mean the higher eddy kinetic energy, thus the eddy may have enough residual energy to cause the further breakage of daughter fragments. It can be seen from Figure 8 that the PBB of bubble is always higher than that of drop at the same N, which is consistent with the observation of Andersson and…”

Section: Resultsmentioning

confidence: 89%

“…It can be seen that the breakage probability of bubble or drop quickly increases with increasing N or d 0 , which is consistent with the experimental finding in the literature. 30,31,[48][49][50][51] This is because the larger d 0 may cause the weaker stability stress to resist the external destructive stress inflicted by turbulent eddy. Besides, the size range of turbulent eddy contributing to fluid particle breakage and the probability of collision between fluid particle and the eddy may increase with d 0 .…”

Section: Breakage Time and Breakage Probabilitymentioning

confidence: 99%

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Experimental study on the differences between bubble and drop breakages in agitated turbulent flows

Zhang,

Huang,

et al. 2024

AIChE Journal

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The available experimental data focusing on the differences between bubble and drop breakages are still scarce in the literature. This work conducts the experiments of single bubble and single drop breakages in agitated turbulent flows. The effects of fluid particle size and agitation speed on daughter fragment number, breakage time, breakage probability, breakage frequency, and daughter size distribution (DSD) are analyzed. The breakage frequencies of bubble and drop show the monotonic and non‐monotonic variation trends with increasing fluid particle size, respectively. The variations of bubble and drop DSDs exhibit opposite trends, the probability of equal‐sized breakage of bubble increases while that of drop decreases when agitation speed or fluid particle size increases. These different trends cannot be predicted by most of the existing models simultaneously. The processes of elongation and internal flow redistribution during deformation may be the important factors causing these differences.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 89%

Section: Breakage Time and Breakage Probabilitymentioning

confidence: 99%

See 2 more Smart Citations

Experimental study on the differences between bubble and drop breakages in agitated turbulent flows

Zhang,

Huang,

et al. 2024

AIChE Journal

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“…Figure 10 depicts the influence of cathode compartment flow velocity in the existence of aeration on the output current density. By breaking giant bubbles into tiny bubbles, aeration and flow velocity in the water chamber promote bubble dispersion [21,25,27]. The dissolved oxygen level rises as a result of this dispersion.…”

Section: Flow Conditionsmentioning

confidence: 99%

Effect of Electrode Surface Enhancement on the Performance of Microbial Fuel Cell Under Flow Conditions

Kudier

Atta

Majdi³

et al. 2022

Egypt. J. Chem.

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The current research investigated and analyzed the influence of electrode surface enhancement on microbial fuel cell (MFC) efficiency under different flow circumstances. In this study, two double chamber cathode and anode, identically designed and built as a completely mixed system, were run for 60 minutes using yeast, salt, water, and sugar as anode substrate. The produced electrical current in MFC was determined for smooth and enhanced surface (punched plate) of a copper electrode in double chambers MFC for a range of stirring speeds 0, 250 rpm, and 500 rpm. The effect of air pumping and dispersion in each MFC chamber on the produced current was investigated under different stirring rates. A considerable electrical current was created due to the micro-organism bioactivity on the electrode surface, which caused a difference in the electrochemical potential between the two chambers. A remarkable increase in the produced current was noticed when the flow velocity was increased in the cathode chamber. However, the flow in the micro-organism chamber reduced the amount of the produced current. Enhancing the electrode surface by increasing the contact area with the biomass causes an increased mass transfer or charge transfer between the solution and the electrode surface. As a result of surface enhancement, an increase in the current output levels depends on the flow velocity. The conjoint effect of flow velocity and aeration, especially for the enhanced electrode surface, causes an appreciable increase of the produced current in MFC, reaching up to 3 times the smooth surface. The presence of air bubbles in the cathode chamber caused a noticeable increase in the produced current density. The presence of substrate glucose showed different influences on the produced current depending on the electrode surface.

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The Local Dependence of Bubble Breakup for Different Impeller Geometries in a Stirred Tank

Hamad

Hasan

Majdi

et al. 2022

Iran J Sci Technol Trans Mech Eng

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Experimental characterization of dynamic behavior of single bubble breakage in an agitated tank

Cited by 3 publications

References 44 publications

Experimental study on the differences between bubble and drop breakages in agitated turbulent flows

Experimental study on the differences between bubble and drop breakages in agitated turbulent flows

Effect of Electrode Surface Enhancement on the Performance of Microbial Fuel Cell Under Flow Conditions

The Local Dependence of Bubble Breakup for Different Impeller Geometries in a Stirred Tank

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