Effect of Impeller Blade Angle on Power Consumption and Flow Pattern in Horizontal Stirred Vessel

2010 ◽  
Vol 43 (8) ◽  
pp. 635-640 ◽  
Author(s):  
Tao Yang ◽  
Koji Takahashi
Keyword(s):  
Power Consumption ◽  
Flow Pattern ◽  
Blade Angle ◽  
Impeller Blade ◽  
Stirred Vessel

scholarly journals Correlation of Power Consumption of Double Impeller Based on Impeller Spacing in Laminar Region

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Haruki Furukawa ◽  
Toshiki Kamiya ◽  
Yoshihito Kato
Keyword(s):  
Power Consumption ◽  
Flow Pattern ◽  
Impeller Blade ◽  
Blade Height ◽  
New Correlation

Power consumption is an important parameter for the design of mixing equipment. The aim of this study is to develop a new correlation of the power consumption of a double impeller. The effect of impeller spacing on the double-impeller flow pattern and power consumption was investigated in the laminar region. As a result, the effect of impeller spacing on the flow pattern was described based on the ratio of impeller spacing to the impeller blade height. Moreover, the power consumption of a double impeller could be correlated with the same ratio.

The Clogging Behavior of a Vortex Pump: An Experimental Study on the Influence of Impeller Designs

2017 ◽  
Author(s):  
Angela Gerlach ◽  
Dorian Perlitz ◽  
Flemming Lykholt-Ustrup ◽  
Christian Brix Jacobsen ◽  
Paul Uwe Thamsen
Keyword(s):  
Experimental Study ◽  
Power Consumption ◽  
Clear Water ◽  
Blade Angle ◽  
Flow Rates ◽  
Blade Number ◽  
Outlet Angle ◽  
Vortex Pump ◽  
Efficiency Losses ◽  
Angle Blade

This paper analyzes the clogging behavior of a vortex pump with different impeller designs. The influence of blade outlet angle, blade number, and impeller diameter were tested. Non-woven textiles in different concentrations served as the clogging material. The results suggest that a smaller outlet blade angle, a higher blade number, and a larger impeller diameter allow pumping more textiles. Impellers that were capable of pumping more textiles, however, were less efficient. Overall, pumping textiles causes efficiency losses. However, this could not be only related to increased power consumption. Flow rates under clogging operation were close to the flow rates under clear water operation irrespective of the amount of clogging material and the impellers design. Further, in all tests clogging material accumulated at the suction mouth in the casing.

Numerical study of fluid flow and power consumption in a stirred vessel with a Scaba 6SRGT impeller

2011 ◽  
Vol 32 (4) ◽  
pp. 351-366 ◽  
Author(s):  
Houari Ameur ◽  
Mohamed Bouzit ◽  
Mustapha Helmaoui
Keyword(s):  
Experimental Data ◽  
Fluid Flow ◽  
Power Consumption ◽  
Yield Stress ◽  
Short Distance ◽  
Numerical Study ◽  
Stirred Vessel ◽  
Higher Power ◽  
Shear Thinning Fluid ◽  
Good Agreement

Numerical study of fluid flow and power consumption in a stirred vessel with a Scaba 6SRGT impeller The present work deals with agitation of non-Newtonian fluids in a stirred vessel by Scaba impellers. A commercial CFD package (CFX 12.0) was used to solve the 3D hydrodynamics and to characterise at every point flow patterns especially in the region swept by the impeller. A shear thinning fluid with yield stress was modelled. The influence of agitator speed, impeller location and blade size on the fluid flow and power consumption was investigated. The results obtained are compared with available experimental data and a good agreement is observed. It was found that an increase in blade size is beneficial to enlargement of the well stirred region, but that results in an increased power consumption. A short distance between the impeller and the tank walls limits the flow around the agitator and yields higher power consumption. Thus, the precise middle of the tank is the most appropriate position for this kind of impeller.

scholarly journals Investigation of Horizontal Velocity Fields in Stirred Vessels with Helical Coils by PIV

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Volker Bliem ◽  
Heyko Jürgen Schultz
Keyword(s):  
Heat Transfer ◽  
Flow Pattern ◽  
Axial Flow ◽  
Flow Fields ◽  
Horizontal Velocity ◽  
Heat Transfer Area ◽  
Stirred Vessel ◽  
Rushton Turbine ◽  
Helical Coils ◽  
Improved Design

Horizontal velocity flow fields were measured by particle image velocimetry for a stirred vessel with baffles and two helical coils for enlargement of heat transfer area. The investigation was carried out in a cylindrical vessel with flat base and two different stirrers (radial-flow Rushton turbine and axial-flow propeller stirrer). Combined velocity plots for flow fields at different locations are presented. It was found that helical coils change the flow pattern significantly. Measurements for the axial-flow Rushton turbine showed a strong deflection by the coils, leading to a mainly tangential flow pattern. Behind baffles large areas of unused heat transfer area were found. First results for the axial-flow propeller reveal an extensive absence of fluid movement in the horizontal plane. Improved design considerations for enhanced heat transfer by more compatible equipment compilation are proposed.

CFD analysis of flow pattern and power consumption for viscous fluids in in-line high shear mixers

2017 ◽  
Vol 117 ◽  
pp. 190-204 ◽  
Author(s):  
Chen Zhang ◽  
Junjie Gu ◽  
Hongyun Qin ◽  
Qin Xu ◽  
Wei Li ◽  
...  
Keyword(s):  
Power Consumption ◽  
Flow Pattern ◽  
Viscous Fluids ◽  
High Shear ◽  
Cfd Analysis

scholarly journals CFD Investigation Of Mixing Of Yield-Pseudoplastic Fluid With Anchor Impeller

2021 ◽  
Author(s):  
Poonam Prajapati
Keyword(s):  
Power Consumption ◽  
Mixing Time ◽  
Diameter Ratio ◽  
Cfd Modeling ◽  
Cylindrical Tank ◽  
Flat Bottom ◽  
Pseudoplastic Fluid ◽  
Impeller Blade ◽  
Blade Width ◽  
Fluid Rheology

The Anchor impeller, which is a close clearance impeller, produces high shear near the vessel wall and is recommended for mixing of highly viscous fluids. A thorough search of the literature suggests that few publications have beeen devoted to the computational fluid dynamics (CFD) modeling of mixing of non-Newtonian fluids with the anchor impeller. Thus the objectives of this study are (i)to generate a 3-D flow field for mixing of yield-pseudoplastic fluid in a flat bottom cylindrical tank equipped with two-and four-blade anchor impellers using CFD modeling technique, (ii) to evaluate the effects of fluid rheology agitator speed, number of blades, vessel clearance and impeller blade width on power consumption, mixing time and flow patterns, and (iii) to determine the optimum value of clearance to diameter ratio and impeller blade width to diameter ratio on the basis of minimum mixing time. The study was carried out for a yield-stress pseudoplastic fluid, using a CFD package (Fluent), to simulate the 3-D flow domain generated in a cylindrical tank equipped with two-and four-blade anchor impellers. The multiple reference frame (MRF) technique was employed to model the rotation of impellers. The rheology of the fluid was approximated using the Herschel-Bulkley model. To validate the model, CFD results for the power were compared to experimental data. After the flow fields were calculated, the simulations for tracer homogenization was performed to simulate the mixing time. The effect of impeller speed, fluid rheology, and number of impellers on power consumption, mixing time, and flow pattern were explored. The optimum values of c/D (clearance to diameter) and w/D (impeller blade width to diameter) ratios were determined on the basis of minimum mixing time.

Effect of Thickness of Mixing Impeller Blade on Power Consumption

2015 ◽  
Vol 41 (4) ◽  
pp. 215-219 ◽  
Author(s):  
Yoshihito Kato ◽  
Haruki Furukawa ◽  
Keita Fujii ◽  
Ryo Nagumo ◽  
Yutaka Tada ◽  
...  
Keyword(s):  
Power Consumption ◽  
Impeller Blade
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