Effect of the Number of Impeller Blades on the Drop Sizes in Agitated Dispersions

Giapos, A.; Pachatouridis, Chrysostomos; Stamatoudis, Michael

doi:10.1205/cherd.04167

Cited by 31 publications

(21 citation statements)

References 12 publications

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“…Some of these studies are summarized in Table 1. Majority of them (Vermeulen et al, 1955;Rodger et al, 1956;Weinstein and Treybal, 1973;Mlynek and Resnick, 1972;Fernandes and Sharma, 1967;Brown and Pitt, 1974;McManamey, 1978;Calabrese et al, 1986a,b;Wang and Calabrese 1986;Nishikaw et al, 1987a,b;Laso et al, 1987;Chatzi et al, 1991;Zhou and Kresta, 1998;Pacek et al, 1999;Ruiz et al, 2002;Desnoyer et al, 2003;Giapos et al, 2005;Sechremeli et al, 2006) have been done on batch vessels. Only few of them have been done on continuous flow stirred tanks (Wienstein and Treybal, 1973;Fernandes and Sharma, 1967;Quadros and Baptista, 2003).…”

Section: Literature Reviewmentioning

confidence: 99%

Representative drop sizes and drop size distributions in A/O dispersions in continuous flow stirred tank

et al. 2008

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Section: Literature Reviewmentioning

confidence: 99%

Representative drop sizes and drop size distributions in A/O dispersions in continuous flow stirred tank

et al. 2008

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“…Conventional methods of droplet formation include agitation and membrane emulsification. The former method produces microcapsules with an unfavorable coefficient of variation (CV) between 10 and 50% (Giapos et al 2005), while the latter method has a lower efficiency and a higher cost. Microfluidic devices can produce emulsions that are monodispersed and have high formation frequencies.…”

Section: Introductionmentioning

confidence: 99%

Investigation of viscosity effect on droplet formation in T-shaped microchannels by numerical and analytical methods

Sang

Hong

Wang

2008

Microfluid Nanofluid

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Both numerical and analytical models have been developed to explore the viscosity effect of the continuous phase on drop formation at a T-shaped junction in immiscible liquids. The effects of the generalized power law coefficient, the power law exponent and the yield stress on the mechanism of drop breakup, final drop size and frequency of drop formation are studied by using the numerical three-dimensional volume of fluid model. Droplets coalescence in Bingham fluids is observed in the beginning transient period. The effect of yield stress on drop extension is also discussed. Predictions of drop size by using an analytical force balance show satisfactory agreement with simulation results for Newtonian and power law fluids with different viscosity ratios. The approximation error associated with the analytical model for Bingham fluids is also acceptable. This analytical model can greatly shorten the prediction time as compared with the numerical model, which is helpful for on-line control.

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“…Giapos et al [13] found that increasing the number of impeller blades of a disk turbine impeller results in a decrease of the drop sizes. Bates et al [14] found that the power number in an agitated vessel depends also on the impeller blade height.…”

Section: Introductionmentioning

confidence: 99%

Effect of Impeller Blade Height on the Drop Size Distribution in Agitated Dispersions

2006

Self Cite

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A common method to achieve a contact of two liquid phases -required for many chemical engineering operations -is the dispersion of one into the other by mechanical agitation. The drop size distribution in such an agitated dispersion is a result of the dynamic equilibrium existing between the breaking and coalescing drops. A comparison has been made of drop diameters produced by four disk type impellers differing only in blade height (D W = 1, 2, 4 and 6 cm). Measurements in situ at 200, 250, 300, 350, 400, 450 rpm and at holdup fractions 0.02, 0.05, and 0.07, showed that the Sauter mean drop diameters increased up to 140 % as the impeller blade height decreased from 6 to 1 cm. Plots of ln a 32 vs. ln N, lna 32 vs. ln D T and ln a 32 vs. ln a max gave straight lines.

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Effect of the Number of Impeller Blades on the Drop Sizes in Agitated Dispersions

Cited by 31 publications

References 12 publications

Representative drop sizes and drop size distributions in A/O dispersions in continuous flow stirred tank

Representative drop sizes and drop size distributions in A/O dispersions in continuous flow stirred tank

Investigation of viscosity effect on droplet formation in T-shaped microchannels by numerical and analytical methods

Effect of Impeller Blade Height on the Drop Size Distribution in Agitated Dispersions

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