Effect of solid particles on gas holdup in flotation columns—I. Measurement

Banisi, S.; Finch, J.A.; Laplante, A.R.; Weber, M.

doi:10.1016/0009-2509(95)00075-g

Cited by 61 publications

(44 citation statements)

References 30 publications

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“…On the other hand, an interesting dual effect of solids on gas holdup has also been observed (Kara et al, 1982;Pandit and Joshi, 1984;Sada et al, 1986 a,b;Bukur et al, 1990;Khare and Joshi, 1990;Jamialahmadi and Muller-Steinhagen, 1991;Garcia-Ochoa et al, 1997;Xie et al, 2003, see also Table 1 in Banisi et al, 1995a), indicating the presence of two counteracting physical mechanisms. Besides the above mentioned drop in voidage with solids, Kara et al (1982) also find a subtle opposite effect: ".…”

Section: Introductionmentioning

confidence: 80%

“…Zon et al (2002) confirm that hydrophobic particles reduce the holdup. On the other hand, Kelkar et al (1984) report that the wettability enhances the coalescence, and, Banisi et al (1995a) find that no apparent difference exists between hydrophilic and hydrophobic particles. The dual effect is observed also for pulp slurry (Xie et al, 2003).…”

Section: Introductionmentioning

confidence: 95%

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Effect of solids on homogeneous–heterogeneous flow regime transition in bubble columns

Mena

Růžička

Rocha

et al. 2005

Chemical Engineering Science

104

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Experiments were conducted to study the effect of the presence of the solid phase on the homogeneous-heterogeneous flow regime transition in a bubble column 0.14 m diameter. Air, distilled water and calcium alginate beads (2.1 mm, 1023 kg/m 3 ) at concentrations c = 0-30% (vol.) were the phases. The basic data were the voidage-gas flow rate dependences. The critical point, where the homogeneous regime loses stability and the transition begins, was evaluated by the drift flux model. The critical values of voidage and gas flow rate were the quantitative measures of the homogeneous regime stability. These were plotted against the solid phase concentration. It was found, that both the voidage and the critical values increased with the solid content at low solid loading, approx. c = 0-3%, and decreased at higher loading, c > 3%. The homogeneous regime was thus first stabilized and then destabilized. To explain this dual effect, possible physical mechanisms of the solid phase influence on the uniform bubble bed were discussed.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 95%

Effect of solids on homogeneous–heterogeneous flow regime transition in bubble columns

Mena

Růžička

Rocha

et al. 2005

Chemical Engineering Science

104

View full text Add to dashboard Cite

show abstract

“…Many studies [14][15][16][17] have been conducted on the effect of particle wettability on bubble behavior and gas holdup and point out that the gas holdup in a nonwettable particle slurry is lower than that in a wettable particle slurry. They claim that an important characteristic observed for nonwettable particles is a high tendency for bubbles to attach to the particles, and the particles tend to form aggregates; this is consistent with the phenomena observed in the nylon fiber suspension of this study.…”

Section: Resultsmentioning

confidence: 99%

Gas Holdup Behavior in Nylon Fiber Suspensions

Heindel

2004

Ind. Eng. Chem. Res.

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The gas holdup behavior in a nylon fiber suspension with various fiber lengths (L = 2, 3, and 6 mm) is investigated. Experiments are performed over a range of superficial gas velocities (Ug≤ 18 cm/s) and a range of fiber mass fractions (0 ≤ C ≤ 1.8%) in a 15.24-cm-diameter semibatch bubble column. Day-to-day variations in the gas holdup create difficulties in interpreting the effect of the fiber mass fraction. These variations are attributed primarily to nylon fiber surface additives leaching into the suspension water and loss of hydrophobicity in a prolonged water environment. As an alternative, the gas holdup in rayon fiber suspensions is highly reproducible. The gas holdup behavior in a nylon fiber suspension with various fiber lengths (L ) 2, 3, and 6 mm) is investigated. Experiments are performed over a range of superficial gas velocities (U g e 18 cm/s) and a range of fiber mass fractions (0 e C e 1.8%) in a 15.24-cm-diameter semibatch bubble column. Day-to-day variations in the gas holdup create difficulties in interpreting the effect of the fiber mass fraction. These variations are attributed primarily to nylon fiber surface additives leaching into the suspension water and loss of hydrophobicity in a prolonged water environment. As an alternative, the gas holdup in rayon fiber suspensions is highly reproducible.

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“…However, Chen and Fan (1989), Jamialahmadi and Muller-Steinhagen (1991), Banisi et al (1995a), and Van der Zon et al (2002) investigated slurry bubble columns using hydrophilic and hydrophobic particles, and found that gas holdup for hydrophobic particles was lower than that of hydrophilic particles. This difference was not attributed to the apparent viscosity.…”

Section: Effect Of Solid Surface Wettabilitymentioning

confidence: 99%

“…Many studies (Chen and Fan, 1989;Jamialahmadi and Muller-Steinhagen, 1991;Banisi et al, 1995a;Van der Zon et al, 2002) have been conducted on the effect of particle wettability on bubble behavior and gas holdup, and point out that gas holdup in a non-wettable particle slurry is lower than in a wettable particle slurry. They claim that an important characteristic observed for non-wettable particles is a high tendency for bubbles to attach to the particles, and the particles tend to form aggregates; this is consistent with the phenomena observed in the Nylon fiber suspension of this study.…”

Section: Comparison Of Gas Holdup With Rayon Fiber Suspensionmentioning

confidence: 99%

Gas holdup in a gas-liquid-fiber semi-batch bubble column

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Effect of solid particles on gas holdup in flotation columns—I. Measurement

Cited by 61 publications

References 30 publications

Effect of solids on homogeneous–heterogeneous flow regime transition in bubble columns

Effect of solids on homogeneous–heterogeneous flow regime transition in bubble columns

Gas Holdup Behavior in Nylon Fiber Suspensions

Gas holdup in a gas-liquid-fiber semi-batch bubble column

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