Hydrodynamic study involving a maxblend impeller with yield stress fluids

Ameur, Houari; Bouzit, Mohamed; Helmaoui, Mustapha

doi:10.1007/s12206-012-0337-3

Cited by 22 publications

(8 citation statements)

References 21 publications

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“…Furthermore, [36] investigated "the hydrodynamic characteristics of the maxblend impeller. A commercial CFD package (CFX 12.0) was used to solve the 3D hydrodynamics and to characterize the flow patterns at every point.…”

Section: Type I -Mixer With Onementioning

confidence: 99%

Development of Operating Model for the Design of Stirrer Arms of Slurries: A Review

Okpighe

Shadrack

Nwosu

2022

CJAST

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An in dept review of the Development of Operating Model for the Design of Stirrer Arms of Slurries is reported. The works of several authors were reviewed. These works covered research on the importance of slurries, application of different slurries in the area of Agriculture and agricultural farming, construction and allied industries, foods and pharmaceutical industries, chemical and paints industries. Also considered were the research works on the design, fabrication and test investigation of performance of different stirrer arms. From the review, three key outcomes from three set of researchers were identified thus: Researcher team 1: the TTP propeller was the most efficient in liquid phase mixing; Researcher team 2: the TEET geometry contributed the best quality of the mixing and significantly reduced the cost of the mixing process; Researcher team 3: the two Z blade stirrer arm was considered as the best in terms of mixing effectiveness. These three outcomes appear as standalone and do not give the user(s) information on comparative advantages for deployment of stirrer arms. Consequent on the above, further theoretical and empirical research will need to be done to evaluate the Order of Merit of these stirrer arms to be called to bar.

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Section: Type I -Mixer With Onementioning

confidence: 99%

Development of Operating Model for the Design of Stirrer Arms of Slurries: A Review

Okpighe

Shadrack

Nwosu

2022

CJAST

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“…Although no information has been reported regarding the impact of the clearance of the Maxblend impeller on the solid-liquid mixing operation,Ameur et al (2012) observed the formation of a secondary loop while increasing the impeller clearance in the mixing of the yield stress fluids. The secondary loop vanished when off-bottom clearance was decreased, improving down and up movement remarkably Hosseini et al (2010a).…”

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confidence: 90%

Using tomography and computational fluid dynamics to study the performance of a maxblend impeller for solid-liquid mixing operations

Mishra¹

2021

Preprint

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A thorough literature review suggests that no comprehensive research work has been done regarding the characterization of the local solid concentrations in a slurry reactor equipped with a Maxblend impeller. The aim of this research work was to assess the mixing performance of a Maxblend impeller in a slurry reactor through electrical resistance tomography (ERT) and computational fluid dynamics (CFD). The mixing efficiency of the Maxblend impeller for solid-liquid mixing operation was compared to those measured for the A200 (an axial-flow impeller) and the Rushton turbine (a radial-flow impeller). The tomography images were employed to assess the particles distribution inside the slurry reactor. The CFD model was created using the Eulerian and Eulerian (E-E) method, standard k-ε turbulence model, and sliding mesh (SM) technique for simulating the two-phase fluid flow, turbulence effects, and stirrer rotation, respectively. The validated CFD model was utilized to obtain the particle concentration profiles and to determine the local particle distributions attained by the Maxblend impeller. The data were utilized to analyze the impacts of various important parameters such as the agitation speed, particle concentration, particle diameter, specific gravity of the particle, and the use of baffles on the mixing efficiency of the Maxblend impeller in terms of the extent of homogeneity and mixing index. The particle distribution in the slurry reactor furnished with a Maxblend impeller was also assessed through clouding height and just suspended agitation speed approaches in this study. The results from this study showed that the assessment of the optimum impeller speed is extremely important to enhance the local mixing quality in the mixing vessel. Experimental tests demonstrated that maximum homogeneity attained by the Maxblend impeller was higher than those for the A200 and Rushton impellers.

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“…This means that by uniform changes in the velocity distribution when using the MB impeller at low P v , the µ eff was decreased, and the cell growth and enzyme activity also was increased. It was shown [31] that the local K L a values in the mixing of Xanthan gum by a 3-RT near the bottom of the impeller were 1.4 times greater with a local K L a that was strongly dependent on the local flow field. The results of the velocity distribution (Fig.…”

Section: Drtmentioning

confidence: 99%

Intensifying the Fermentation of Aspergillus oryzae in a Stirred Bioreactor Using Maxblend Impeller

Ghobadi¹,

Ogino²,

Ohmura³

2016

TOCENGJ

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Background: The intensification of fermentation in stirred bioreactors is an attractive approach for commercial interests and industries that work with biochemical products. Alpha amylase is an enzymatic bio-products that is produced largely from Aspergillus oryzae. Using adaptable agitator can be an efficient way for stirred fermentation. Objective: This study, concentrated on enhancing the mixing process in order to intensify Aspergillus oryzae fermentation. A straight type of Maxblend® impeller was used as an agitator to investigate the incubation parameters compared with the use of a 6-blade double Rushton turbine. Method: Stirred fermentation was done in batch condition. Effect of flow pattern of mixing on fermentation parameters was investigated after each sampling. Results: The results showed that the Maxblend® significantly intensified both enzyme activity and growth rate at low and moderate rates of power consumption (P). The main reason for the decreases in the growth rate and the enzyme activity during agitation by the Rushton turbine at low and high Pv was the lack of oxygen and mycelial damage, respectively. Additionally, use of the Maxblend® significantly intensified the KLa at low and moderate rates of power consumption. Conclusion: Axial and uniform mixing by Maxblend® impeller was resulted in improving the fermentation characteristics and enzyme activity.

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Hydrodynamic study involving a maxblend impeller with yield stress fluids

Cited by 22 publications

References 21 publications

Development of Operating Model for the Design of Stirrer Arms of Slurries: A Review

Development of Operating Model for the Design of Stirrer Arms of Slurries: A Review

Using tomography and computational fluid dynamics to study the performance of a maxblend impeller for solid-liquid mixing operations

Intensifying the Fermentation of Aspergillus oryzae in a Stirred Bioreactor Using Maxblend Impeller

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