A Study Involving the Flow Pattern Comparison of a PIV Experiment With CFD Simulation, for the Flow Within a Centrifugal Pump

2014 ◽  
Author(s):  
Md. Taifur Rahman ◽  
Mohammed Siddiqi
Keyword(s):  
Centrifugal Pump ◽  
Single Phase ◽  
Cfd Simulation ◽  
Computational Simulation ◽  
Test Subject ◽  
Cfd Modeling ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Turbo Machinery ◽  
Multi Phase

Computational Fluid Dynamics (CFD) modeling software is increasingly being used as the tool of choice for analyzing the flow details and integrated performance of turbo-machinery products. In fact, the use of CFD is rapidly transitioning from a verification tool to an upfront design-enabling & optimization tool. Experimental validation of computational simulation is essential to ensure an acceptable degree of reliability and relevance of the simulated results to real world performance. While CFD has been rigorously validated for numerous simple physics cases like single-phase flow, more complex physics applications, e.g., those involving multi-phase solid-liquid flows, require more elaborate and thoughtful means of validation. In this context, a study was undertaken to review Particle Image Velocimetry (PIV) as a means of validating more complex CFD cases and to contrast the findings with those obtained from CFD simulation. PIV offers a new possibility for flow visualization in turbo-machinery passages, in contrast to traditional methods like flow probing or hot-wire anemometry, which can be a very challenging proposition in the rotating domain of a turbo-machinery blade system. This paper discusses the first phase of this work, which was limited to single-phase flow studies, with the intent to follow up further with multi-phase flow studies. A specially designed fractional horsepower centrifugal pump is used as a test subject to analyze all possible parameters of the flow field using PIV and the result is then compared with the CFD simulations of the same model. The results show a reasonable match in the flow patterns obtained by the two alternate methods, although significant differences are apparent too. In conclusion, each method has its own place in the context of turbo-machinery flow studies.

Numerical 3D Simulation of the Cavitating Flow in a Centrifugal Pump With Low Specific Speed and Evaluation of the Suction Head

2014 ◽  
Author(s):  
Phillip Limbach ◽  
Marius Kimoto ◽  
Christian Deimel ◽  
Romuald Skoda
Keyword(s):  
Centrifugal Pump ◽  
Single Phase ◽  
Cavitating Flow ◽  
Model Parameters ◽  
Pump Efficiency ◽  
Phase Flow ◽  
Flow Conditions ◽  
Single Phase Flow ◽  
Low Specific Speed ◽  
Specific Speed

A numerical analysis is performed to assess the capability of common simulation methods, in particular Ansys CFX, to predict the performance and NPSH curve of a centrifugal pump at very low specific speed for both, design and off-design conditions. In all cases, we use an entire numerical model containing the impeller, the volute casing, the side chambers as well as suction pipe and pressure pipe. A three-dimensional setup is used, testing the following numerical models: steady, i.e. frozen rotor model, unsteady model accounting for the impeller movement and the relative impeller-volute position, single-phase flow as well as cavitating flow conditions. The global performance of the pump is assessed in terms of pressure head, power consumption and pump efficiency for single-phase flow. Furthermore, the drop of the pump head and Net Positive Suction Head (NPSH) characteristics are analyzed for cavitating flow conditions. Numerical results are validated against experimental data. Regarding non-cavitating flow conditions, the trend of the characteristic curves is well predicted, while absolute performance values differ from measured data significantly. The results of steady and unsteady calculations deviate from each other by less than 2%. Concerning cavitating flow, unsteady simulations have to be performed in particular for overload conditions, in order to obtain convergence of the solver. The trend of the measured NPSH curve is well captured with default cavitation model parameters. For nominal and overload, the predicted NPSH curve underestimates the measured one significantly.

scholarly journals Simulation of Drag Reducer Polymer (DRP) for Single and Annular Two Phase Flow in Horizontal Pipe

2018 ◽  
Vol 13 (2) ◽  
pp. 154-164
Author(s):  
Cindy Dianita ◽  
Asep Handaya Saputra ◽  
Puteri Amelia Khairunissa
Keyword(s):  
Drag Reduction ◽  
Annular Flow ◽  
Single Phase ◽  
Cfd Simulation ◽  
Fluid Velocity ◽  
Flow Equation ◽  
Equation Model ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Two Phase

Drag reducing polymers (DRP) is one of drag reducer types that is widely used in industry as an additive to improve fluid flow efficiency in pipes. This study is conducted to analyze the parameters that influence the efficiency of DRP through developing equation model, and to see the phenomenon of drag reduction that occurs in fluid flow through computational fluid dynamic (CFD) simulation. The data used are obtained from experiments by Vancko (1997) for a single phase flow of water. As for two-phase annular flow, four experiments data are used namely by Vancko (1997), Al-Sarkhi and Hanratty (2001a,b) and Fernandes et al. (2004). Parameters such as fluid velocity and pipe diameter are analyzed based on the model equations proposed in this study. The final single phase flow equation model as the output of this study gives a value for onset drag reduction i.e 4.00 with an error up to 18%. While the proposed annular flow equation with and without drag reduction effect is only suitable when the condition of fluid film distribution is uniform and symmetrical with the error around 20%, i.e. for smaller diameter pipes. The CFD simulation results shows a change in the fluid velocity profile; becoming more parabolic, indicating an increase in the mean fluid velocity up to 0.43%, as the effect of DRP.

CFD modeling of single-phase flow in a packed bed with MRI validation

AIChE Journal ◽  
2012 ◽  
Vol 58 (12) ◽  
pp. 3904-3915 ◽  
Author(s):  
David J. Robbins ◽  
M. Samir El-Bachir ◽  
Lynn F. Gladden ◽  
R. Stewart Cant ◽  
Erik von Harbou
Keyword(s):  
Single Phase ◽  
Packed Bed ◽  
Cfd Modeling ◽  
Phase Flow ◽  
Single Phase Flow

Capabilities and Challenges of CFD in Multiphase Simulation of Hydraulic Tanks

2014 ◽  
Author(s):  
Thees Vollmer ◽  
Johannes Untch
Keyword(s):  
Multiphase Flow ◽  
Single Phase ◽  
Test Bench ◽  
Cfd Simulation ◽  
Air Flow ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Major Purpose ◽  
Flow Models ◽  
Multiphase Models

A major purpose of hydraulic tanks is the segregation of air, which can be supported by different design measures. To improve these measures CFD multiphase simulation can be used, as it is capable to assess the air flow within the oil. The different possibilities of CFD simulation are presented. Here single-phase flow models, simplified multiphase models as well as full multiphase flow models are discussed and evaluated. An example of each presented method is given and the results are compared. Last the capabilities of validating the simulations on a test bench are briefly discussed.

Measurement and CFD simulation of single-phase flow in solvent extraction pulsed column

2006 ◽  
Vol 61 (9) ◽  
pp. 2930-2938 ◽  
Author(s):  
J.M. Bujalski ◽  
W. Yang ◽  
J. Nikolov ◽  
C.B. Solnordal ◽  
M.P. Schwarz
Keyword(s):  
Solvent Extraction ◽  
Single Phase ◽  
Cfd Simulation ◽  
Phase Flow ◽  
Single Phase Flow
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