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Efficiency of PBT Impellers with Different Blade Cross-Sections. ENERGIES 2022. [DOI: 10.3390/en15020585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In this study, the mixing power and the axial and radial velocity distributions were determined for the standard PBT45-6 impeller with inclined blades and for three NACA impellers with airfoil blades. On the basis of the velocity distributions obtained by means of PIV techniques, the pumping efficiency and the size of the secondary circulation for the tested impellers were determined. The next stage was to calculate the efficiency of the impeller operation, in which the comparative criteria were the values of the mixing energy in the form of a dimensional and dimensionless criterion. The lowest mixing energy was obtained for impellers with symmetrical profiled NACA0021 blades, which was 20% lower than the similar mixing energy obtained for the standard PBT45-6 impeller.
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The Influence of Hydrodynamic Changes in a System with a Pitched Blade Turbine on Mixing Power. Processes (Basel) 2020. [DOI: 10.3390/pr9010068] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
This paper presents an analysis of hydrodynamics in a tank with a 45° and 60° pitched blade turbine impeller operating while emptying the mixer and with an axial agitator working during axial pumping-down of water at different water levels above the impeller. Measurements made with the PIV method confirmed the change in direction of pumping liquid after the level dropped below the critical value, with an almost unchanged liquid stream flowing through the mixer. It was found that an increase in the value of the tangential velocity in the area of the impeller took place and the quantity of this increase depended on the angle of the blade pitch and the rotational frequency of the impeller. Change in this velocity component increased the mixing power.
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Abstract
The mixing process in a mechanically agitated vessel is a widespread phenomenon which plays an important role among industrial processes. In that process, one of the crucial parameters, the mixing efficiency, depends on a large number of geometrical factors, as well as process parameters and complex interactions between the phases which are still not well understood. In the last decade, large progress has been made in optimisation, construction and numerical and experimental analysis of mechanically agitated vessels. In this review, the current state in this field has been presented. It shows that advanced computational fluid dynamic techniques for multiphase flow analysis with reactions and modern experimental techniques can be used with success to analyse in detail mixing features in liquid-liquid, gas-liquid, solid-liquid and in more than two-phase flows. The objective is to show the most important research recently carried out.
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Influence of the vessel shape on the performance of a mechanically agitated system. CHEMICAL PAPERS 2018. [DOI: 10.1007/s11696-018-0606-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Patel D, Ein-Mozaffari F, Mehrvar M. Effect of rheological parameters on non-ideal flows in the continuous-flow mixing of biopolymer solutions. Chem Eng Res Des 2015. [DOI: 10.1016/j.cherd.2015.05.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Guo L, Du Y, Yi Q, Li D, Cao L, Du D. Efficient removal of arsenic from “dirty acid” wastewater by using a novel immersed multi-start distributor for sulphide feeding. Sep Purif Technol 2015. [DOI: 10.1016/j.seppur.2014.12.029] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Dagadu CPK, Stegowski Z, Sogbey BJAY, Adzaklo SY. Mixing Analysis in a Stirred Tank Using Computational Fluid Dynamics. ACTA ACUST UNITED AC 2015. [DOI: 10.4236/jamp.2015.36076] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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8
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Patel D, Ein-Mozaffari F, Mehrvar M. Tomography images to analyze the deformation of the cavern in the continuous-flow mixing of non-Newtonian fluids. AIChE J 2013. [DOI: 10.1002/aic.14235] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Dineshkumar Patel
- Dept. of Chemical Engineering; Ryerson University; Toronto ON M5B 2K3 Canada
| | | | - Mehrab Mehrvar
- Dept. of Chemical Engineering; Ryerson University; Toronto ON M5B 2K3 Canada
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Patel D, Ein-Mozaffari F, Mehrvar M. Characterization of the continuous-flow mixing of non-Newtonian fluids using the ratio of residence time to batch mixing time. Chem Eng Res Des 2013. [DOI: 10.1016/j.cherd.2013.01.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Patel D, Ein-Mozaffari F, Mehrvar M. Using a tracer technique to identify the extent of non-ideal flows in the continuous mixing of non-Newtonian fluids. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20135001006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Improving the dynamic performance of continuous-flow mixing of pseudoplastic fluids possessing yield stress using Maxblend impeller. Chem Eng Res Des 2012. [DOI: 10.1016/j.cherd.2011.08.022] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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12
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Patel D, Ein-Mozaffari F, Mehrvar M. Effect of impeller type on continuous-flow mixing of non-Newtonian fluids in stirred vessels through dynamic tests. CAN J CHEM ENG 2011. [DOI: 10.1002/cjce.21628] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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13
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Patel VR, Ein-Mozaffari F, Upreti SR. Effect of time delays in characterizing the continuous mixing of non-Newtonian fluids in stirred-tank reactors. Chem Eng Res Des 2011. [DOI: 10.1016/j.cherd.2011.01.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Patel D, Ein-Mozaffari F, Mehrvar M. Dynamic Performance of Continuous-Flow Mixing of Pseudoplastic Fluids Exhibiting Yield Stress in Stirred Reactors. Ind Eng Chem Res 2011. [DOI: 10.1021/ie102388y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dineshkumar Patel
- Department of Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3 Canada
| | - Farhad Ein-Mozaffari
- Department of Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3 Canada
| | - Mehrab Mehrvar
- Department of Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3 Canada
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15
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Liu M. Prediction of Tracer Concentration and Mixing in CFSTRs with Mean Age Distribution. Ind Eng Chem Res 2011. [DOI: 10.1021/ie2002395] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Minye Liu
- DuPont Company, 1007 Market Street, Wilmington, Delaware 19898, United States
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Saeed S, Ein-Mozaffari F, Upreti SR. Using Computational Fluid Dynamics To Study the Dynamic Behavior of the Continuous Mixing of Herschel−Bulkley Fluids. Ind Eng Chem Res 2008. [DOI: 10.1021/ie800496x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Salwan Saeed
- Department of Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada
| | - Farhad Ein-Mozaffari
- Department of Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada
| | - Simant R. Upreti
- Department of Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada
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18
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CFD simulation of gas–liquid flows in stirred vessel equipped with dual rushton turbines: influence of parallel, merging and diverging flow configurations. Chem Eng Sci 2008. [DOI: 10.1016/j.ces.2008.04.039] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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19
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Singh KK, Mahajani SM, Shenoy KT, Ghosh SK. Computational Fluid Dynamics Modeling of a Bench-scale Pump−Mixer: Head, Power and Residence Time Distribution. Ind Eng Chem Res 2007. [DOI: 10.1021/ie061102m] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Dewan A, Buwa V, Durst F. Performance Optimizations of Grid Disc Impellers for Mixing of Single-Phase Flows in a Stirred Vessel. Chem Eng Res Des 2006. [DOI: 10.1205/cherd05044] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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21
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Aubin J, Kresta S, Bertrand J, Xuereb C, Fletcher D. Alternate Operating Methods for Improving the Performance of Continuous Stirred Tank Reactors. Chem Eng Res Des 2006. [DOI: 10.1205/cherd.05216] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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22
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Khopkar AR, Kasat GR, Pandit AB, Ranade VV. Computational Fluid Dynamics Simulation of the Solid Suspension in a Stirred Slurry Reactor. Ind Eng Chem Res 2006. [DOI: 10.1021/ie050941q] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. R. Khopkar
- Industrial Flow Modeling Group, National Chemical Laboratory, Pune, India 411 008, and Chemical Engineering Department, University Institute of Chemical Technology, Mumbai, India 400 019
| | - G. R. Kasat
- Industrial Flow Modeling Group, National Chemical Laboratory, Pune, India 411 008, and Chemical Engineering Department, University Institute of Chemical Technology, Mumbai, India 400 019
| | - A. B. Pandit
- Industrial Flow Modeling Group, National Chemical Laboratory, Pune, India 411 008, and Chemical Engineering Department, University Institute of Chemical Technology, Mumbai, India 400 019
| | - V. V. Ranade
- Industrial Flow Modeling Group, National Chemical Laboratory, Pune, India 411 008, and Chemical Engineering Department, University Institute of Chemical Technology, Mumbai, India 400 019
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Fluid dynamics and mixing of single-phase flow in a stirred vessel with a grid disc impeller: Experimental and numerical investigations. Chem Eng Sci 2006. [DOI: 10.1016/j.ces.2005.10.066] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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