Dispersion of water into oil in a rotor–stator mixer. Part 2: Effect of phase fraction

Rueger, Paul E.; Calabrese, Richard V.

doi:10.1016/j.cherd.2013.06.010

Cited by 27 publications

(11 citation statements)

References 14 publications

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“…For more concentrated emulsions (discussed in Part 2) (Rueger and Calabrese, 2013), the equilibrium DSD is reached when there is a dynamic balance between the rates of breakage and coalescence (Coulaloglou and Tavlarides, 1977). The absence of coalescence in dilute systems allows for the isolated study of the effect of breakage so that an emulsion may be said to have reached "equilibrium" when all of the drops are below the maximum stable drop size, as determined by the maximum deformation rate in the flow field (Leng and Calabrese, 2004).…”

Section: Theorymentioning

confidence: 99%

“…The microscope slides were rendered hydrophobic by treatment with Glassclad 18, a hydrophobic silane (method discussed in Part 2) (Rueger and Calabrese, 2013). This treatment was necessary to prevent the water drops from spreading on the glass surface which would have made it inaccurate to determine the volume of a drop by simply measuring the projected area of a sphere.…”

Section: Dispersion Experimentsmentioning

confidence: 99%

“…1) with a rotor diameter of 28.12 mm and a clearance of ı = 0.185 mm (shear gap) between the rotor blade tip and the inner wall of the stator. First, a 2 L glass vessel, which had been treated (with a hydrophobic silane by a method which is discussed in Part 2) (Rueger and Calabrese, 2013) to prevent the adhesion of water drops, was charged with pure Crystal Oil FG. It was then attached to the mixer, and left overnight to reach thermal equilibrium at rotor speed N = 3900 rpm.…”

Section: Dispersion Experimentsmentioning

confidence: 99%

See 2 more Smart Citations

Dispersion of water into oil in a rotor–stator mixer. Part 1: Drop breakup in dilute systems

Rueger

Calabrese

2013

Chemical Engineering Research and Design

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Section: Theorymentioning

confidence: 99%

Section: Dispersion Experimentsmentioning

confidence: 99%

Section: Dispersion Experimentsmentioning

confidence: 99%

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Dispersion of water into oil in a rotor–stator mixer. Part 1: Drop breakup in dilute systems

Rueger

Calabrese

2013

Chemical Engineering Research and Design

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“…Dispersion and coalescence in liquid multiphase systems is a research topic addressed by numerous researchers, since knowledge and prediction of the droplet sizes is important to understand and optimize various industrial processes . A droplet population, e.g., in a stirred tank, is defined by the processes of droplet breakage by the stirrer and turbulent eddies and droplet coalescence.…”

Section: Introductionmentioning

confidence: 99%

“…Reviews on various models from literature have been published for example by Ramkrishna , Liao and Lucas , , or Kamp et al . Higher dispersed‐phase fractions usually lead to larger droplet sizes , , . This effect is induced by an intensified coalescence rate (collision frequency) but also by the influence of turbulence damping on the breakage rate .…”

Section: Introductionmentioning

confidence: 99%

Mass Transfer and Drop Size Distributions in Reactive Nanoparticle‐Stabilized Multiphase Systems

Petzold

Röhl

Hohl

et al. 2017

Chemie Ingenieur Technik

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Mass transfer in stirred liquid-liquid systems with and without silica nanoparticles is investigated for the saponification of benzoyl chloride. The mass transfer area is positively affected by the nanoparticles which lead to an increase of the liquidliquid interfacial area due to droplet coalescence hindrance. However, an additional mass transfer resistance induced by particles at the liquid-liquid interface was observed for all particle concentrations, since the high occupancy diminishes the available area for mass transfer. The ratio of the two oppositional effects needs to be determined to identify suitable nanoparticle reaction systems.

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Numerical study of turbulent liquid‐liquid dispersions

2015

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A numerical approach is developed to gain fundamental insight in liquid‐liquid dispersion formation under well‐controlled turbulent conditions. The approach is based on a free energy lattice Boltzmann equation method, and relies on detailed resolution of the interaction of the dispersed and continuous phase at the microscopic level, including drop breakup and coalescence. The capability of the numerical technique to perform direct numerical simulations of turbulently agitated liquid‐liquid dispersions is assessed. Three‐dimensional simulations are carried out in fully periodic cubic domains with grids of size . The liquids are of equal density. Viscosity ratios (dispersed phase over continuous phase) are in the range 0.3–1.0. The dispersed phase volume fraction varies from 0.001 to 0.2. The process of dispersion formation is followed and visualized. The size of each drop in the dispersion is measured in‐line with no disturbance of the flow. However, the numerical method is plagued by numerical dissolution of drops that are smaller than 10 times the lattice spacing. It is shown that to mitigate this effect it is necessary to increase the resolution of the Kolmogorov scales, such as to have a minimum drop size in the range 20–30 lattice units [lu]. Four levels of Kolmogorov length scale resolution have been considered , 2.5, 5, and 10 [lu]. In addition, the numerical dissolution reduces if the concentration of the dispersed phase is increased. © 2015 American Institute of Chemical Engineers AIChE J, 61: 2618–2633, 2015

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Dispersion of water into oil in a rotor–stator mixer. Part 2: Effect of phase fraction

Cited by 27 publications

References 14 publications

Dispersion of water into oil in a rotor–stator mixer. Part 1: Drop breakup in dilute systems

Dispersion of water into oil in a rotor–stator mixer. Part 1: Drop breakup in dilute systems

Mass Transfer and Drop Size Distributions in Reactive Nanoparticle‐Stabilized Multiphase Systems

Numerical study of turbulent liquid‐liquid dispersions

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