Cellular automata modeling of continuous stirred tank reactors

Pérez-Terrazas, Jaime Enrique; Ibarra-Junquera, Vrani; Rosu, H. C.

doi:10.1007/s11814-008-0078-2

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…Among the continuous bioreactors, the fluidized-bed ones are the most suitable for operating multienzyme systems, because problems like mass transfer and establishment of pH and temperature gradients in the reaction medium are negligible [13]. In particular, the so-called unimodular membrane reactor-a continuous stirred tank reactor (CSTR) coupled with an ultrafiltration membrane, which is set at the bottom of the vessel-is a kind of fluidized bed reactor which can easily operate with both soluble or insoluble enzymes [9,12].…”

Section: Introductionmentioning

confidence: 99%

Multienzymatic Sucrose Conversion into Fructose and Gluconic Acid through Fed-Batch and Membrane-Continuous Processes

Taraboulsi

Tomotani²,

Vítolo³

2011

Appl Biochem Biotechnol

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Multienzymatic conversion of sucrose into fructose and gluconic acid was studied through fed-batch and continuous (in a membrane reactor) processes. The law of substrate addition (sucrose or glucose) for the fed-batch process which led to a yield superior to 80% was the decreasing linear type, whose feeding rate (ϕ; L/h) was calculated through the equation: ϕ = ϕ(o) - k.t, where ϕ(o) (initial feeding rate, L/h), k (linear addition constant, L/h (2)), and t (reaction time, h). In the continuous process, the yield of conversion of sucrose (Y) was superior to 70% under the following conditions: dilution rate = 0.33 h(-1), total duration of 15 h, pH 5.0, 37 °C and initial sucrose concentration of 64 g/L (Y = 92%), 100 g/L (Y = 83%), or 150 g/L (Y = 76%).

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Section: Introductionmentioning

confidence: 99%

Multienzymatic Sucrose Conversion into Fructose and Gluconic Acid through Fed-Batch and Membrane-Continuous Processes

Taraboulsi

Tomotani²,

Vítolo³

2011

Appl Biochem Biotechnol

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“…In recent years, the numerical modeling of mixing in a stirred tank (reactor) has attracted a great deal of attention [7]. The developments in computational fluid dynamics (CFD) have accelerated in the past two decades due to the spectacular progress in digital computing.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational fluid dynamics modeling of mixing by Visco-jet impellers

Rahimi

Amraei

Alsairafi

2011

Korean J. Chem. Eng.

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This paper reports experimental and computational frluid dynamics (CFD) studies on an impeller called Visco-jet with the aim of finding the effect of two side diameters ratio of its blade, which has a semi-conical shape, on drawdown process of floating polymericparticles into high viscosity glycerin solution. Nine different geometries were examined experimentally, and there were significant differences in their performance. The results reveal that when diameter of smaller side of semi-cone impeller is half of the other side, mixing was performed in a more efficient way. The CFD-predicted results have been used for explaining the experimental observation. The CFD-predicted hydrodynamics parameters confirm superiority of this geometry compared with the other ones.

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“…In recent years, the numerical modeling of mixing in a stirred tank (reactor) has attracted a great deal of attention [6]. The quick and vast development of numerical techniques and software abilities can presently take advantage of highly sophisticated engineering techniques such as computational fluid dynamics (CFD) calculation.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational fluid dynamic (CFD) studies on mixing characteristics of a modified helical ribbon impeller

Rahimi

Kakekhani

Alsairafi

2010

Korean J. Chem. Eng.

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Experimental and computational fluid dynamic (CFD) modeling studies have been performed on mixing characteristics of a new modified helical ribbon impeller in a viscous medium. A novel arrangement for the multiple reference frame (MRF) technique was proposed and the modeling results were compared with those of conventional MRF selecting method. Calculations were performed to study the effects of several parameters: axial flow number, axial circulation time, impeller clearance, and power consumption. The higher performance of the modified impeller has been proven in terms of axial flow number and axial circulation time. The results showed that significant improvement in mixing performance can be obtained at a higher impeller clearance with the modified impeller employed. In addition, the power consumption by the new impeller has been compared with that of the classic one. The CFDpredicted flow patterns generated by the impellers were used to explain the higher performance of the modified impeller. In addition, the results reveal that the CFD-predicted particle volume fractions at various axial distances from the tank bottom are reasonably in agreement with the experimental observations.

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Cellular automata modeling of continuous stirred tank reactors

Cited by 7 publications

References 13 publications

Multienzymatic Sucrose Conversion into Fructose and Gluconic Acid through Fed-Batch and Membrane-Continuous Processes

Multienzymatic Sucrose Conversion into Fructose and Gluconic Acid through Fed-Batch and Membrane-Continuous Processes

Experimental and computational fluid dynamics modeling of mixing by Visco-jet impellers

Experimental and computational fluid dynamic (CFD) studies on mixing characteristics of a modified helical ribbon impeller

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