Hydrodynamic drag and rise velocity of microbubbles in papermaking process waters

Haapala, Antti; Honkanen, Markus; Liimatainen, Henrikki; Stoor, Tuomas; Niinimäki, Jouko

doi:10.1016/j.cej.2010.07.001

Cited by 16 publications

(14 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All the bubble velocities were between 0.5 and 2.5 cm/s. These results are in accordance with experimental results found by Haapala et al (2010), who conducted flotation with a sintered aerator to produce microbubbles in the presence of carboxymethyl cellulose (CMC), n-buthanol and wood fibers. The authors found that the velocity of microbubbles between 100 µm and 300 µm ranged from 0.3 cm/s to 2.5 cm/s.…”

Section: Bubble Velocity Analysissupporting

confidence: 81%

Bubble Dynamics of Batik Dyeing Waste Separation using Flotation

Warjito

Nurrohman²

2016

IJTech

View full text Add to dashboard Cite

Batik waste can increase water characteristics, such as turbidity, color and total suspended solids (TSS). Thus, an efficient technique for separating Batik from the liquid to decrease these characteristics is needed. The aim of the current study was to understand the results of flotation using electrolysis and to investigate the bubble characteristics that influence the results of the flotation of Batik waste. Flotation studies have been conducted using electrolysis to produce bubbles to separate batik synthetic dye from the liquid. Research conducted with 316L stainless steel electrodes, inside a 100 cm tall acrylic pipe with an inner diameter of 8.4 cm and a voltage variation of 10, 15 and 20 V. Batik waste was mixed with distilled water. Commercial alum powder [aluminum sulfate, Al 2 (SO 4 ) 3 .14H 2 O, that is 17% Al 2 O 3 ] as the reagent was added to coagulate Batik waste in a ratio of 1 gram per 10 ml of Batik waste. The results showed that flotation of Batik waste can be used to separate Batik waste with the addition of alum. Alum was shown to be capable of acting as a collector in this type of waste separation. The results showed that flotation using electrolysis could be an effective method for reducing turbidity, color and TSS.

show abstract

Section: Bubble Velocity Analysissupporting

confidence: 81%

Bubble Dynamics of Batik Dyeing Waste Separation using Flotation

Warjito

Nurrohman²

2016

IJTech

View full text Add to dashboard Cite

show abstract

“…Moreover, fibers can damp fluctuations of flow velocity and reduce the fluid turbulence, thus providing stagnant flow conditions for rising bubbles. 35 As shown in Figure 5b, the descending bubbles are small bubbles with diameters smaller than 2 mm and their velocity distributions show sharp peak distributions. The variation of the mean bubble velocity was consistent with that of the mean bubble diameter.…”

Section: Resultsmentioning

confidence: 83%

“…Because the hydrophobicity of the nylon fiber is poor, 12 the long effective range of hydrophobic interactions will enhance the adhesion between bubbles and fibers. 35 Furthermore, more bubbles will be attached to the fibers, which accelerates the movement of the fiber-bubble agglomerate. Comparing the mean bubble velocities with mean bubble diameters in region 3 in Figure 5b, the variations of mean descending bubble velocities do not always follow the rules that the velocity of large bubbles is faster than that of small bubbles.…”

Section: Resultsmentioning

confidence: 99%

“…The factors affecting bubble velocity distributions are mainly bubble characteristics (bubble size and shape), liquid properties (viscosity and surface tension), and operating conditions (bubble column structure, superficial gas velocity, solid concentration, pressure, and temperature) . Although many studies have been carried out on the bubble velocity distributions in the slurry bubble columns, − the studies on bubble velocity distributions in the fiber suspensions are still scarce and mainly focus on semi-dilute and concentrated fiber suspensions. − Moreover, bubble velocity distributions in an annular bubbling structure of the scrubbing–cooling chamber with diluted fiber suspensions have never been studied. There are mainly two techniques for bubble velocity measurement in a bubble column: nonintrusive and intrusive techniques.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Local Distributions of Bubble Velocity and Interfacial Area in the Slender Particle-Containing Scrubbing–Cooling Chamber of an Entrained-Flow Gasifier

Zhao

Peng

Wang

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Radial bubble velocities, chord lengths, and local gas holdups were measured by a dual-tip conductivity probe in a slender particle-containing scrubbing–cooling chamber. The annulus region of the bubbling bed was divided into three regions according to the radial distributions of bubble velocity, bubble size, and local gas holdup. Bubble velocity distributions were obtained by the kernel density estimation, and the relationships between mean bubble velocity and diameter were discussed. The interfacial area was calculated by the size distribution of total bubbles in the bed which was transformed from that of total bubbles touching the probe by an analytical transformation method. Effects of superficial gas velocity, fiber volume fraction, and aspect ratio on the distributions of bubble velocity and interfacial area were discussed. The experimental interfacial area values were in good agreement with the calculated ones obtained by the modified Besagni and Inzoli correlation.

show abstract

“…They observed a reversible effect of transition in bubble boundary condition from full-slip to no-slip condition that depends on pH, ionic strength and film thickness. Haapala et al [13] studied the hydrodynamic of microbubbles in papermaking process waters. In our previous article, [14] the hydrodynamics of the microbubble suspension flow are enunciated based on the dynamic interaction of the phases.…”

Section: Introductionmentioning

confidence: 99%

Terminal rise velocity, size distribution and stability of microbubble suspension

Parmar

Majumder

2015

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

Dispersed bubbly flow plays an imperative role in the chemical, biochemical and food industries. In the present work, the physics of liquid and gas properties on motion of microbubble in various liquid media was enunciated. The size of microbubble and the distribution of microbubbles generated by the pressurised dissolution method in different liquid media is also examined. Experimental result shows that the terminal rise velocity of microbubble is significantly affected by liquid and gas properties. The stability of microbubble dispersion is analysed by the drainage mechanism. The stability of microbubble dispersions is also examined by using its electrical properties. Correlations are also developed to interpret the bubble size, half-life and drainage mechanism of microbubble. The present study may be useful for further understanding microbubble aided processes and developing them for industrial applications.

show abstract

Hydrodynamic drag and rise velocity of microbubbles in papermaking process waters

Cited by 16 publications

References 27 publications

Bubble Dynamics of Batik Dyeing Waste Separation using Flotation

Bubble Dynamics of Batik Dyeing Waste Separation using Flotation

Local Distributions of Bubble Velocity and Interfacial Area in the Slender Particle-Containing Scrubbing–Cooling Chamber of an Entrained-Flow Gasifier

Terminal rise velocity, size distribution and stability of microbubble suspension

Contact Info

Product

Resources

About