Sauter mean and maximum drop diameters of liquid-liquid dispersions in turbulent agitated vessels at low dispersed phase hold-up

McManamey, W. J.

doi:10.1016/0009-2509(79)85081-2

Cited by 58 publications

(26 citation statements)

References 6 publications

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“…The relation of these results to the findings of Bourne [51] and newer literature data incorporating similar methods are discussed in Daub et al [24]. As an example for the value of the correlations from Table 1 for aerated operating conditions, Figure 6 compares all data obtained in this work with ϵ max calculated with the correlation of McManamey [28]. This equation was used because it might be the most common correlation to estimate ϵ max [24].…”

Section: Resultssupporting

confidence: 65%

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Characterization of hydromechanical stress in aerated stirred tanks up to 40 m3 scale by measurement of maximum stable drop size

et al. 2014

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BackgroundTurbulence intensity, or hydromechanical stress, is a parameter that influences a broad range of processes in the fields of chemical engineering and biotechnology. Fermentation processes are often characterized by high agitation and aeration intensity resulting in high gas void fractions of up to 20% in large scale reactors. Very little experimental data on hydromechanical stress for such operating conditions exists because of the problems associated with measuring hydromechanical stress under aeration and intense agitation.ResultsAn indirect method to quantify hydromechanical stress for aerated operating conditions by the measurement of maximum stable drop size in a break-up controlled dispersion was applied to characterize hydromechanical stress in reactor scales of 50 L, 3 m3 and 40 m3 volume with a broad range of operating conditions and impeller geometries (Rushton turbines). Results for impellers within each scale for the ratio of maximum to specific energy dissipation rate ϕ based on measured values of maximum stable drop size for aerated operating conditions are qualitatively in agreement with results from literature correlations for unaerated operating conditions. Comparison of data in the different scales shows that there is a scale effect that results in higher values for ϕ in larger reactors. This behavior is not covered by the classic theory of turbulent drop dispersion but is in good agreement with the theory of turbulence intermittency. The data for all impeller configurations and all aeration rates for the three scales can be correlated within ±20% when calculated values for ϕ based on the measured values for dmax are used to calculate the maximum local energy dissipation rate. A correlation of the data for all scales and all impeller configurations in the form ϕ = 2.3∙(ϕunaerated)0.34∙(DR)0.543 is suggested that successfully models the influence of scale and impeller geometry on ϕ for aerated operating conditions.ConclusionsThe results show that besides the impeller geometry, also aeration and scale strongly influence hydromechanical stress. Incorporating these effects is beneficial for a successful scale up or scale down of this parameter. This can be done by applying the suggested correlation or by measuring hydromechanical stress with the experimental method used in this study.

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Section: Resultssupporting

confidence: 65%

“…ϵ max calculated from ϵ Ø with ϕ = ϵ max /ϵ Ø based on the equation of McManamey [28] for non-aerated conditions. Dispersion of paraffin oil in 1 mM PO 4 -buffer at pH 7.3.…”

Section: Resultsmentioning

confidence: 99%

Characterization of hydromechanical stress in aerated stirred tanks up to 40 m3 scale by measurement of maximum stable drop size

et al. 2014

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“…Many authors, such as Zhou and Kresta (1996), have estimated the maximum energy dissipation rate experimentally from turbulence measurements, as a function of mixer dimensions and agitation rate, for various stirred tank impellers. However, there is no known comparable study for the rotor-stator mixer used in this study, so the maximum energy dissipation rate is approximated here by analogy to the impeller swept volume approach (McManamey, 1979). According to Fig.…”

Section: Turbulent Systemsmentioning

confidence: 99%

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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“…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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Sauter mean and maximum drop diameters of liquid-liquid dispersions in turbulent agitated vessels at low dispersed phase hold-up

Cited by 58 publications

References 6 publications

Characterization of hydromechanical stress in aerated stirred tanks up to 40 m3 scale by measurement of maximum stable drop size

Characterization of hydromechanical stress in aerated stirred tanks up to 40 m3 scale by measurement of maximum stable drop size

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

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

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