Influence of fluid properties on bubble formation, detachment, rising and collapse; Investigation using volume of fluid method

Zahedi, Peyman; Saleh, Reza; Moreno-Atanasio, Roberto; Yousefi, Kianoosh

doi:10.1007/s11814-014-0063-x

Cited by 60 publications

(29 citation statements)

References 30 publications

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“…Dimensionless bubble volume versus Bond number. Available data for air‐water are also included from Lesage and Marois, Bari and Robinson, Zahedi et al…”

Section: Resultsmentioning

confidence: 99%

“…The pressure was solved using the PRESTO! scheme . The transient model is based on an explicit scheme and a time step of 0.1 ms was used, which gives a Courant number of 0.25.…”

Section: Methodsmentioning

confidence: 99%

“…Bari and Robinson investigated quasi‐static bubble growth in water for different gas injection rates (10 and 100 mL/h) using orifices of 0.58, 1.05, and 1.6 mm. In this study, orifice size was found to have a great effect on bubble shape, contact pressure force, and departure characteristics of the bubble.The formation characteristics of a single bubble under various conditions have also been investigated by numerical methods . For example, Quan and Hua utilized a finite volume method based on the SIMPLE scheme coupled with a front tracking method to study the effects of varying fluid properties on bubble break‐off.…”

Section: Introductionmentioning

confidence: 99%

“…The formation characteristics of a single bubble under various conditions have also been investigated by numerical methods. [5,[16][17][18][19][20][21][22][23][24][25][26][27][28][29] For example, Quan and Hua [19] utilized a finite volume method based on the SIMPLE scheme coupled with a front tracking method to study the effects of varying fluid properties on bubble break-off. They found that the radius of the bubble neck decreases but the volume of the bubble increases with increases in viscosity and the surface tension coefficient.…”

Section: Introductionmentioning

confidence: 99%

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Effect of orifice size and bond number on bubble formation characteristics: A CFD study

et al. 2015

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The volume of fluid with the continuum surface force (VOF-CSF) model has been used in the present numerical study to investigate bubble formation and shapes in a bubble column. The effects of orifice sizes ranging from 0.5-1.5 mm on the bubble formation stages (i.e., expansion, elongation, and pinch-off), bubble contact angle, departure diameter, time, and shape of bubble are investigated under a constant inlet velocity (0.2 m/s) boundary condition (BC). It is found that the initial formation of a bubble is dependent on the orifice diameter. Consequently, the formation of the bubble's hemispherical shape at the orifice is faster for a smaller orifice diameter than for a larger orifice diameter which forms a bigger bubble. A leading bubble requires a longer time to detach itself from an orifice in comparison to the next bubble (the second bubble), but interestingly the third bubble detaches much faster than the second. This model was also used to investigate the effect of the Bond number (Bo s ). An increase of the Bond number (Bo s ) from 0.047 to 0.16 speeds up the bubble pinch-off, but a further increase in the Bo s (e.g. 0.17-0.47) slows it down. Based on the simulated cases used in this study, the findings demonstrate the capacity and accuracy of the CFD method in predicting bubble formation characteristics. The findings may be useful in the design of spargers for bubble column reactors.

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“…Dimensionless bubble volume versus Bond number. Available data for air‐water are also included from Lesage and Marois, Bari and Robinson, Zahedi et al…”

Section: Resultsmentioning

confidence: 99%

“…The pressure was solved using the PRESTO! scheme . The transient model is based on an explicit scheme and a time step of 0.1 ms was used, which gives a Courant number of 0.25.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of orifice size and bond number on bubble formation characteristics: A CFD study

et al. 2015

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“…In comparison with feeding gas properties, many researches considered the influence of liquid properties (e.g., viscosity and surface tension) on the bubble size, shape, velocity and coalescence process [16,17,[27][28][29]. The larger bubble is generated in high viscous liquid with longer formation time [28].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Methane bubble formation and dynamics in a rectangular bubble column: A CFD study

Pourtousi

Ganesan

Kazemzadeh

et al. 2015

Chemometrics and Intelligent Laboratory Systems

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Numerical study of co‐axial bubble coalescence characteristics

Islam

Ganesan

Sahu

et al. 2015

Asia-Pacific J Chem Eng

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Bubble coalescences have a significant role in petroleum and chemical industries for proper mixing, good heat and mass transfer between the gas and liquid phases. In this study, the volume of fluid method has been used to model for investigation of co-axial bubble coalescence dynamic evolution in stagnant fluid. The CSF method was incorporated as a source term in the momentum equation to track the motion of the bubble and liquid interface. The effects of Bond number ranges, Bo~4.09-50 (variation of the surface tension) and Reynolds number range, Re~0.98-120 (variation of the liquid viscosity) were investigated. Significant effects were observed in the process of bubble coalescence on the shape of bubbles when the viscosity ratio (μ r ), and density ratio (ρ r ) were kept constant. The changes in bubble shape with progressing time were validated by the experimental observation of available literature. For low Bo and Re, the late coalescence of the bubbles was found, whereas the shape of the succeeding bubbles had changed significantly. The same ratio of Bo/μ r and Bo/Re does not affect the bubble coalescence process, if Bo, μ r and Re is reduced to 82%. By the study of co-axial coalescence of three bubbles, it is found that the liquid-film rupture and bubble breakup between the middle and third bubble occurs faster for both low and high Re. Figure 4. Predicted two co-axial bubble coalescence for (a) Re = 12, Bo = 50, r = 1000, r = 100 (Case 2) and (b) Re = 10, Bo = 50, r = 850, r = 100 (Chen et al. [16] ).Asia-Pacific Journal of Chemical Engineering NUMERICAL STUDY OF CO-AXIAL BUBBLE COALESCENCE 675 Bo = 5 ; (1st) Bo = 5 ; (2nd) Bo = 5 ; (3rd) Bo = 50 ; (1st) Bo = 50 ; (2nd) Bo = 50 ; (3rd) Figure 9. Effect of Bond number on three co-axial bubble rising history for Re = 12, r = 1000 and r = 100. Figure 10. Predicted three co-axial bubbles coalescence for r = 1000 and r = 100. (a) Re = 1.2, Bo = 50. (b) Re = 120, Bo = 50. MD. T. ISLAM ET AL. Asia-Pacific Journal of Chemical Engineering 678

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Influence of fluid properties on bubble formation, detachment, rising and collapse; Investigation using volume of fluid method

Cited by 60 publications

References 30 publications

Effect of orifice size and bond number on bubble formation characteristics: A CFD study

Effect of orifice size and bond number on bubble formation characteristics: A CFD study

Methane bubble formation and dynamics in a rectangular bubble column: A CFD study

Numerical study of co‐axial bubble coalescence characteristics

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