Effect of surfactants and interfacial rheology on equilibrium drop size in turbulent liquid-liquid dispersions

Padron, Gustavo A.; Calabrese, Richard V.

doi:10.1016/j.cherd.2023.05.046

Cited by 3 publications

(2 citation statements)

References 58 publications

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“…The length scale of turbulence l 0 was approximated considering the projected height of the impellers [28]. For Rushton turbines and the wave ribbon impeller l 0 = h/2, whereas for the propeller and propeller ring l 0 = h.…”

Section: Experimental Setup and Impellers Under Investigationmentioning

confidence: 99%

Comparative Study of Fluid Dynamic Stress on Aspergillus niger and Model Systems

Waldherr,

Bliatsiou,

Böhm

et al. 2024

Chemie Ingenieur Technik

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The productivity of Aspergillus niger cultivations is strongly linked to the pellet morphology. In this article, the agitation‐ and aeration‐induced stress on bio agglomerates is studied. To facilitate investigations, non‐biological particle systems are extensively used to model the actual biological matter. The literature lacks a direct comparison of model systems with the biological system of interest, leaving uncertainties in the applicability of such systems. This work shows that the results for the impellers' stress intensity of three A. niger strains agree qualitatively with the ones of four developed model systems of different nature (s/l, l/l). The findings justify the usage of model systems, despite certain limitations originating from their specific characteristic properties.

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Section: Experimental Setup and Impellers Under Investigationmentioning

confidence: 99%

Comparative Study of Fluid Dynamic Stress on Aspergillus niger and Model Systems

Waldherr,

Bliatsiou,

Böhm

et al. 2024

Chemie Ingenieur Technik

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show abstract

“…DSD is a critical quality attribute (CQA) intrinsically related to rheology, appearance, and overall emulsion quality. It is influenced by several parameters, including the homogenization technique, , the physical properties of the liquid phase, the type of emulsifier used, , and the temperature protocol . Numerous studies in the literature have delved into the influence of DSD on viscosity.…”

Section: Introductionmentioning

confidence: 99%

Dense Oil in Water Emulsions using Vortex-Based Hydrodynamic Cavitation: Effective Viscosity, Sauter Mean Diameter, and Droplet Size Distribution

Upadhyay,

Ravi,

Ranade

2024

Ind. Eng. Chem. Res.

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Vortex-based hydrodynamic cavitation offers an effective platform for producing emulsions. In this work, we have investigated characteristics of dense oil in water emulsions with oil volume fractions up to 60% produced using a vortex-based cavitation device. Emulsions were prepared using rapeseed oil with oil volume fractions of 0.15, 0.3, 0.45, and 0.6. For each of these volume fractions, the pressure drop as a function of the flow rate of emulsions through the cavitation device was measured. These data were used for estimating the effective viscosity of the emulsions. The droplet size distribution of the emulsions was measured using the laser diffraction technique. The influence of the number of passes through the cavitation device on droplet size distributions and the Sauter mean diameter was quantified. It was found that the Sauter mean diameter (d 32 ) decreases with an increase in the number of passes as n −0.2 . The Sauter mean diameter was found to be almost independent of oil volume fraction (α o ) up to a certain critical volume fraction (α oc ). Beyond α oc , d 32 was found to be linearly proportional to a further increase in oil volume fraction. As expected, the turbidity of the produced emulsions was found to be linearly proportional to the oil volume fraction. The slope of turbidity versus oil volume fraction can be used to estimate the Sauter mean diameter. A suitable correlation was developed to relate turbidity, volume fraction, and Sauter mean diameter. The droplet breakage efficiency of the vortex-based cavitation device for dense oil in water emulsions was quantified and reported. The breakage efficiency was found to increase linearly with an increase in oil volume fraction up to α oc and then plateau with a further increase in the oil volume fraction. The breakage efficiency was found to decrease with an increase in energy consumption per unit mass (E) as E −0.8 . The presented results demonstrate the effectiveness of a vortex-based cavitation device for producing dense oil in water emulsions and will be useful for extending its applications to other dense emulsions.

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Investigation of Hydraulic Behavior in a Gas-Agitated Disc and Doughnut Column for Solvent Extraction

Wang,

Xu,

Tan

et al. 2024

Preprint

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Effect of surfactants and interfacial rheology on equilibrium drop size in turbulent liquid-liquid dispersions

Cited by 3 publications

References 58 publications

Comparative Study of Fluid Dynamic Stress on Aspergillus niger and Model Systems

Comparative Study of Fluid Dynamic Stress on Aspergillus niger and Model Systems

Dense Oil in Water Emulsions using Vortex-Based Hydrodynamic Cavitation: Effective Viscosity, Sauter Mean Diameter, and Droplet Size Distribution

Investigation of Hydraulic Behavior in a Gas-Agitated Disc and Doughnut Column for Solvent Extraction

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