scholarly journals CFD Analysis of Modified Rushton Turbine Impeller

2021 ◽  
pp. 8-13
Author(s):  
I. Jenish ◽  
M. Appadurai ◽  
E. Fantin Irudaya Raj
Keyword(s):  
Radial Flow ◽  
Cfd Analysis ◽  
Impeller Blade ◽  
Power Number ◽  
Rushton Turbine ◽  
Stirred Vessels ◽  
Fluid Resistance ◽  
Mixing Chamber ◽  
Higher Power ◽  
Turbine Impeller

Mixing units is one of the prime components in various chemical processing industries. The mixing equipment produces a product by combing different liquids at various properties. Generally, the mixing units are axial and radial flow types. The rushton turbine is one of the radial flow types and had higher power number due to fluid resistance as disadvantage. This works aims to investigate the four bladed rushton turbine impellers at eight angles for finding optimum power without compromising radial flow patterns. The shaft eccentricity hydrodynamics effect is also analysed on the unbaffled stirred vessels. The variance of eccentric and coaxial agitation is clearly evaluated on the several power number and impeller blade angle by experimental and numerical analysis. The CFD analysis is made on the mixing chamber to find the optimum inputs of the mixing chamber numerically by varying the blade angles.

Effect of Baffle Length on Power Consumption in Turbulent Mixing Vessel with Rushton Turbine Impeller

2011 ◽  
Vol 37 (2) ◽  
pp. 147-149 ◽  
Author(s):  
Yoshihito Kato ◽  
Noboru Kamei ◽  
Yutaka Tada ◽  
Azusa Nakaoka ◽  
Yuichiro Nagatsu ◽  
...  
Keyword(s):  
Power Consumption ◽  
Turbulent Mixing ◽  
Rushton Turbine ◽  
Turbine Impeller

scholarly journals CFD simulation of flow patterns in unbaffled stirred tank with CD-6 impeller

2012 ◽  
Vol 18 (4-1) ◽  
pp. 535-546 ◽  
Author(s):  
Tamphasana Devi ◽  
Bimlesh Kumar
Keyword(s):  
Numerical Simulations ◽  
Cfd Simulation ◽  
Flow Patterns ◽  
Industrial Applications ◽  
Spatial Variations ◽  
Stirred Tank ◽  
Rushton Turbine ◽  
Stirred Vessels

Understanding the flow in stirred vessels can be useful for a wide number of industrial applications. There is a wealth of numerical simulations of stirring vessels with standard impeller such as Rushton turbine and pitch blade turbine. Here, a CFD study has been performed to observe the spatial variations (angular, axial and radial) of hydrodynamics (velocity and turbulence field) in unbaffled stirred tank with Concave-bladed Disc turbine (CD-6) impeller. Three speeds (N=296, 638 & 844.6 rpm) have been considered for this study. The angular variations of hydrodynamics of stirred tank were found very less as compared to axial and radial variations.

Rub Interactions of Flexible Casing Rotor Systems

1989 ◽  
Vol 111 (4) ◽  
pp. 652-658 ◽  
Author(s):  
F. K. Choy ◽  
J. Padovan ◽  
C. Batur
Keyword(s):  
Numerical Solutions ◽  
Spectral Characteristics ◽  
Integration Time ◽  
Sudden Increase ◽  
Time Step ◽  
Impeller Blade ◽  
Rotor Systems ◽  
Machine Failure ◽  
The Time Domain ◽  
Turbine Impeller

Rub interactions between a rotor assembly and its corresponding casing structure has long been one of the major causes for machine failure. Fracture/fatigue failures of turbine impeller blade components may even lead to catastrophic consequences. This paper presents a comprehensive analysis of a complex rotor-bearing-blade-casing system during component rub interactions. The modal method is used in this study. Orthonormal coupled rotor-casing modes are used to obtain accurate relative motion between rotor and casing. External base vibration input and the sudden increase of imbalance are used to simulate suddenly imposed adversed operating condition. Nonlinear turbine/impeller blade effects are included with the various stages of single/multiple blade participation. A variable integration time step procedure is introduced to insure both accuracy and efficiency in numerical solutions. The dynamic characteristics of the system are examined in both the time domain and the frequency domain using a numerical FFT procedure. Nonlinear bearing and seal forces are also included to enhance a better simulation of the operating system. Frequency components of the system spectral characteristics will be correlated with the localized rub excitations to enable rub signature analysis. A multibearing flexible casing rotor system will be used as an example. Conclusions will be drawn from the results of an extensive parametric study.

Miniaturized Methanol Reformer for Fuel Cell Powered Mobile Applications

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
John C Telotte ◽  
Jesse Kern ◽  
Srinivas Palanki
Keyword(s):  
Mobile Applications ◽  
Radial Flow ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Inlet Pressure ◽  
Simulation Studies ◽  
Production Of Hydrogen ◽  
Higher Power ◽  
Reactor Temperature ◽  
Power Application

In this paper, the design of a miniaturized methanol reformer is considered that can operate in two different modes to produce sufficient hydrogen for generating a net power of 24 W and 72 W. The reformer is modeled as a radial flow packed bed reactor and the Ergun equation is used to model the pressure drop. Simulation studies are conducted to study the effect of steam to methanol ratio, inlet pressure and reactor temperature on the production of hydrogen. It is shown that a volume of 20 ml is required to produce sufficient hydrogen for generating the necessary power if an inlet pressure of 202 kPa and a steam to methanol ratio of 1.5 is used. A temperature of 500 K is required for the lower power application while a temperature of 550 K is required for the higher power application.

scholarly journals Effects of baffle length on turbulent flows generated in stirred vessels

2011 ◽  
Vol 1 (4) ◽  
Author(s):  
Meriem Ammar ◽  
Zied Driss ◽  
Wajdi Chtourou ◽  
Mohamed Abid
Keyword(s):  
Turbulent Flows ◽  
Stokes Equations ◽  
Control Volume ◽  
Numerical Results ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Rushton Turbine ◽  
Stirred Vessels ◽  
Hydrodynamic Behaviour ◽  
Effective System

AbstractThe aim of this paper is to study the effect of baffles length on the turbulent flows in stirred tanks. The hydrodynamic behaviour induced by a Rushton turbine (RT6) is numerically predicted by solving the Navier-Stokes equations in conjunction with the Renormalization Group (RNG) of the k-ɛ turbulence model. These equations are solved by a control volume discretization method. The numerical results from the application of the computational fluid dynamics (CFD) code Fluent with the multi-reference frame (MRF) model are presented in the vertical and horizontal planes in the impeller stream region. Our studies were carried out on three different systems. The most effective system was selected based on its calculated power consumption figure. All numerical results showed good agreement with experimental data.

CFD research on the influence of geometry characteristic on flow pattern and the transition mechanism in Rushton turbine stirred vessels

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yinghui Wang ◽  
Lin Hao ◽  
Zhenxing Zhu ◽  
Jinjie Xu ◽  
Hongyuan Wei
Keyword(s):  
Flow Pattern ◽  
Turbulence Models ◽  
Stirred Vessel ◽  
Rushton Turbine ◽  
Stirred Vessels ◽  
Transition Mechanism ◽  
Flow Pattern Transition ◽  
Actual Space ◽  
Geometry Characteristic ◽  
The Relationship

Abstract In this paper, the transient MRF approach coupled with the standard k-ε and SST k-ω turbulence models was employed to study the effect of bottom shape, impeller diameter (D J) and bottom height (H 2) on critical impeller off-bottom clearance (C). It was found the bottom shape and bottom height (H 2) have obvious influence on the flow pattern transition from double-loop to single-loop of RT impeller. The flow pattern transition mechanism was inferred to relate to the relationship between the space required by the lower circulation zone and the actual space. The boundary conditions of critical C were further concluded to help distinguish the flow pattern and receive the expected one in the stirred vessel design.

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