Simulation of the population balances for liquid–liquid systems in a nonideal stirred tank. Part 1 Description and qualitative validation of the model

Alopaeus, Ville; Koskinen, Jukka; Keskinen, Kari I.

doi:10.1016/s0009-2509(99)00170-0

Cited by 166 publications

(107 citation statements)

References 20 publications

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“…(28)) is not very sensitive to changes in the values of the constant C 4 . This constant may vary +/-50%, which agrees to the reported results in the published literature (Alopaeus et al [18,65]). Second, the estimated parameters above were used to simulate a pilot plant RDC column with the total active height of 1.76 m, where its characteristic dimensions are shown in Table 3.…”

Section: Sample Problems Parameter Estimation Using An Rdc Column (Dnsupporting

confidence: 91%

LLECMOD: A Bivariate Population Balance Simulation Tool for Liquid- Liquid Extraction Columns

Attarakih¹,

Bart²,

Steinmetz³

et al. 2008

TOCENGJ

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Abstract:The population balance equation finds many applications in modelling poly-dispersed systems arising in many engineering applications such as aerosols dynamics, crystallization, precipitation, granulation, liquid-liquid, gas-liquid, combustion processes and microbial systems. The population balance lays down a modern approach for modelling the complex discrete behaviour of such systems. Due to the industrial importance of liquid-liquid extraction columns for the separation of many chemicals that are not amenable for separation by distillation, a Windows based program called LLECMOD is developed. Due to the multivariate nature of the population of droplets in liquid -liquid extraction columns (with respect to size and solute concentration), a spatially distributed population balance equation is developed. The basis of LLECMOD depends on modern numerical algorithms that couples the computational fluid dynamics and population balances. To avoid the solution of the momentum balance equations (for the continuous and discrete phases), experimental correlations are used for the estimation of the turbulent energy dissipation and the slip velocities of the moving droplets along with interaction frequencies of breakage and coalescence. The design of LLECMOD is flexible in such a way that allows the user to define droplet terminal velocity, energy dissipation, axial dispersion, breakage and coalescence frequencies and the other internal geometrical details of the column. The user input dialog makes the LLECMOD a user-friendly program that enables the user to select the simulation parameters and functions easily. The program is reinforced by a parameter estimation package for the droplet coalescence models. The scale-up and simulation of agitated extraction columns based on the populations balanced model leads to the main application of the simulation tool.

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Section: Sample Problems Parameter Estimation Using An Rdc Column (Dnsupporting

confidence: 91%

LLECMOD: A Bivariate Population Balance Simulation Tool for Liquid- Liquid Extraction Columns

Attarakih¹,

Bart²,

Steinmetz³

et al. 2008

TOCENGJ

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“…A mixer designed to serve this dual purpose of mixing and pumping is called a pump-mixer (Coplan et al, 1954). Though the pump-mixers are essentially used for producing dispersions of a liquid phase in another immiscible liquid phase, single-phase characteristics are equally important as, with the present status of computing hardware, a practical way of solving population balance in agitated vessels calls for pseudo-single-phase modeling to get the parameters that eventually control drop breakage and coalescence and hence dictate the drop size distributions (Alopaeus et al, 1999;Maggioris et al, 2000;Alexopoulos et al, 2002;Alopaeus et al, 2002). The two important design or performance parameters of a pump-mixer are its power consumption and head generation both of which are affected by several parameters which can be classified either as geometric or process parameters.…”

Section: Introductionmentioning

confidence: 99%

CFD modeling of pilot-scale pump-mixer: Single-phase head and power characteristics

Singh

Mahajani

Shenoy

et al. 2007

Chemical Engineering Science

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The present work involves single-phase computational fluid dynamics (CFD) simulations of continuous flow pump-mixer employing topshrouded Rushton turbines with trapezoidal blades. Baffle-impeller interaction has been modeled using sliding mesh and multiple reference frame approaches. Standard k-model has been used for turbulence modeling. Several CFD runs representing different combinations of geometric and process parameters have been carried out. Results of CFD simulations have been used to find out two macroscopic performance parameters of pump-mixer-power consumption and head generated by the impeller. The simulation results have been compared with the experimental data obtained on a pilot-scale setup. Good agreement between CFD predictions and experimental results is observed. In most cases, sliding mesh approach is found to perform better than multiple reference frame approach. Details from CFD simulations have been used to have an insight into the pumping action of the impeller.

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“…The initial droplet size distribution is affected by the collision, coalescence and breakage frequencies. These frequencies were calculated using the expressions and parameters by Alopaeus et al [22] while the energy dissipation rate, influenced by some properties of the impeller such as impeller speed, impeller diameter, power number of impeller, and naturally the properties of mixed phase, the volume and density of the mixture was computed as discussed by Nere et al [23]. Figure 3 represents the monomer droplet size distribution computed for impeller speed is 350 rpm and dispersed phase volume fraction is 0.3.…”

Section: Yesmentioning

confidence: 99%

Stochastic Simulation of Droplet Interactions in Suspension Polymerization of Vinyl Chloride

Bárkányi

Németh²

2015

Period. Polytech. Chem. Eng.

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Simulation of the population balances for liquid–liquid systems in a nonideal stirred tank. Part 1 Description and qualitative validation of the model

Cited by 166 publications

References 20 publications

LLECMOD: A Bivariate Population Balance Simulation Tool for Liquid- Liquid Extraction Columns

LLECMOD: A Bivariate Population Balance Simulation Tool for Liquid- Liquid Extraction Columns

CFD modeling of pilot-scale pump-mixer: Single-phase head and power characteristics

Stochastic Simulation of Droplet Interactions in Suspension Polymerization of Vinyl Chloride

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