The simplest stirred tank for laminar mixing: Mixing in a vessel agitated by an off-centered angled disc

AIChE Journal ◽  
2013 ◽  
Vol 59 (8) ◽  
pp. 3092-3108 ◽  
Author(s):  
D. Bulnes-Abundis ◽  
M. M. Alvarez
Keyword(s):  
Stirred Tank ◽  
Laminar Mixing

scholarly journals Laminar Mixing in Stirred Tank Agitated by an Impeller Inclined

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Koji Takahashi ◽  
Yoshiharu Sugo ◽  
Yasuyuki Takahata ◽  
Hitoshi Sekine ◽  
Masayuki Nakamura
Keyword(s):  
Numerical Simulation ◽  
Laminar Flow ◽  
Mixing Time ◽  
Flow Region ◽  
Experimental Results ◽  
Stirred Tank ◽  
Simulation Methods ◽  
Mixing Performance ◽  
Laminar Mixing ◽  
Numerical Simulation Methods

The mixing performance in a vessel agitated by an impeller that inclined itself, which is considered one of the typical ways to promote mixing performance by the spatial chaotic mixing, has been investigated experimentally and numerically. The mixing time was measured by the decolorization method and it was found that the inclined impeller could reduce mixing time compared to that obtained by the vertically located impeller in laminar flow region. The effect of eccentric position of inclined impeller on mixing time was also studied and a significant reduction of mixing time was observed. To confirm the experimental results, the velocity profiles were calculated numerically and two novel numerical simulation methods were proposed.

Laminar Mixing in Eccentric Stirred Tank Systems

2008 ◽  
Vol 80 (4) ◽  
pp. 546-557 ◽  
Author(s):  
Mario M. Alvarez ◽  
Paulo E. Arratia ◽  
Fernando J. Muzzio
Keyword(s):  
Stirred Tank ◽  
Laminar Mixing

Laminar Mixing in Eccentric Stirred Tank with Different Bottom

2011 ◽  
Vol 44 (12) ◽  
pp. 931-935 ◽  
Author(s):  
Koji Takahashi ◽  
Daisuke Shigihara ◽  
Yasuyuki Takahata
Keyword(s):  
Stirred Tank ◽  
Laminar Mixing

Laminar Mixing Performances of a Stirred Tank Equipped with Helical Ribbon Agitator Subjected to Steady and Unsteady Rotational Speed

2002 ◽  
Vol 80 (4) ◽  
pp. 335-344 ◽  
Author(s):  
J.-Y. Dieulot ◽  
G. Delaplace ◽  
R. Guerin ◽  
J.-P. Brienne ◽  
J.-C. Leuliet
Keyword(s):  
Rotational Speed ◽  
Stirred Tank ◽  
Helical Ribbon ◽  
Laminar Mixing

Removal of lead by sulfate-reducing bacteria in anaerobic continuous stirred tank reactors

2016 ◽  
Vol 14 (3) ◽  
pp. 557-561
Author(s):  
Nguyễn Thị Yên ◽  
Kiều Thị Quỳnh Hoa
Keyword(s):  
Sulfate Reducing Bacteria ◽  
Stirred Tank ◽  
Synthetic Wastewater ◽  
Terminal Electron Acceptor ◽  
Stirred Tank Reactors ◽  
Sulfate Reducing ◽  
Sulfide Production ◽  
Continuous Stirred Tank ◽  
Continuous Stirred Tank Reactors ◽  
Reducing Bacteria

Lead contaminated wastewater negatively impacts to living organisms as well as humans. In recent years, a highly promising biological process using the anaerobic production of sulfide ions by sulfate-reducing bacteria has presented itself as an alternative option for the removal of lead. This process is based on microbial utilization of electron donors, such as organic compounds (carbon sources), and sulfate as the terminal electron acceptor for sulfide production. The biogenic hydrogen sulfide reacts with dissolved heavy metals to form insoluble metal sulfide precipitates Removal of lead by an enriched consortium of sulfate-reducing bacteria (DM10) was evaluated sulfate reduction, sulfide production and lead precipitation. Four parallel anaerobic continuous stirred tank reactors (CSTR, V = 2L) (referred as R1 - R4) were fed with synthetic wastewater containing Pb2+ in the concentrations of 0, 100, 150 and 200 mg L-1 of lead and operated with a hydraulic retention time of 5 days for 40 days. The loading rates of each metal in R1- R4 were 0, 20, 30 and 40 mg L-1 d-1, respectively. The results showed that there was no inhibition of SRB growth and that lead removal efficiencies of 99-100% for Pb2+ were achieved in R2 (100 mg L-1) and R3 (150 mg L-1) throughout the experiment. For the highest lead concentration of  200 mg L-1, a decrease in efficiency of removal (from 100 to 96%) was observed at the end of the experiment. The obtained result of this study might help for a better control operation and performance improvements of reactors.

Transient response of the 1-st order dynamic system with fluctuating parameters

1979 ◽  
Vol 44 (7) ◽  
pp. 2184-2195
Author(s):  
Vladimír Herles ◽  
Jan Čermák ◽  
Antonín Havlíček
Keyword(s):  
Dynamic System ◽  
Dynamic Behavior ◽  
Transient Response ◽  
Flow Model ◽  
Stirred Tank ◽  
Order System ◽  
Random Parameters ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
Theoretical Results

The paper deals with the analysis of the dynamic behavior of the 1st order system with two random parameters. The theoretical results have been compared with experiments on flow model of a stirred tank reactor.

Venturi tube and single pipe inlet as gas distributors in hydrogenation of rape seed oil

1987 ◽  
Vol 52 (12) ◽  
pp. 2876-2885
Author(s):  
Milan Rylek ◽  
Petr Svoboda ◽  
Jiří Souček
Keyword(s):  
Seed Oil ◽  
Venturi Tube ◽  
Stirred Tank ◽  
Hydrogenation Rate ◽  
Rape Seed ◽  
Tank Reactor ◽  
Scale Unit ◽  
Single Pipe ◽  
Pipe Inlet ◽  
Made In

The effect of hydrogenation conditions on rate of hydrogenation of rape seed oil was studied in a laboratory stirred tank reactor of 250 ml volume, with nickel on kieselguhr catalyst within the range of conditions (150 ⪬ t(°C) ⪬ 190), (0.1 ⪬ P(MPa) ⪬ 1.0), and (0.01 ⪬ cNi(%) ⪬ 0.37). On the basis of these results a comparison of the effect of a Venturi tube and single pipe gas inlet as gas distributors on hydrogenation rate was made in a bench scale unit of 5 l volume.

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