Use of Surface Flow Visualization Methods in Centrifugal Pump Design

2002 ◽  
Vol 124 (2) ◽  
pp. 314-318 ◽  
Author(s):  
Christopher P. Hamkins ◽  
Stephan Bross
Keyword(s):  
Fluid Dynamics ◽  
Boundary Condition ◽  
Centrifugal Pump ◽  
Flow Patterns ◽  
Surface Flow ◽  
Pump Design ◽  
New Type ◽  
Measured Flow ◽  
Computational Fluid Dynamics Cfd ◽  
Modern Image

Surface flow patterns generated with oils or oil paint have been used in centrifugal pump design for many years. Here it is shown how modern image analysis methods allow quantitative predictions of the corresponding pressure distribution by analyzing surface flow patterns. Further, the surface flow patterns can be used to confirm computational fluid dynamics (CFD) results, improve their boundary conditions and determine their limits of validity. The authors see the need for a new type of boundary condition for CFD packages, in which a measured flow pattern could be used as “input.”

Simulation Study of a Porous Overflow-Pipe (POP) Type Hydrocyclone

2012 ◽  
Vol 516-517 ◽  
pp. 1074-1077
Author(s):  
Xue Feng Zhao ◽  
Li Min He ◽  
Li Xin Zhao ◽  
Sheng Zhong ◽  
Yang Wang
Keyword(s):  
Fluid Dynamics ◽  
Oil Content ◽  
Original Structure ◽  
Pipe Length ◽  
Separation Effect ◽  
Overflow Pipe ◽  
New Type ◽  
Fluent Software ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method

Based on computational fluid dynamics (CFD) method, applying FLUENT software, taking a de-oil hydrocyclone as an original structure, the effect of porous overflow pipe on the performance and pressure characteristics is analyzed. Effect of overflow-pipe length and diameter of the porous overflow-pipe (POP) hydrocyclone is studied. It is found that the extension of overflow-pipe length can play a coalescent role; the new type hydrocyclone can increase oil content around overflow outlet so as to be beneficial for the enhancement of separation effect.

scholarly journals The benefits of turbine endwall profiling in a cascade

2005 ◽  
Vol 219 (1) ◽  
pp. 49-59 ◽  
Author(s):  
G Ingram ◽  
D Gregory-Smith ◽  
N Harvey
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Turbulent Flow ◽  
Secondary Flow ◽  
Surface Flow ◽  
Transitional Flow ◽  
Loss Reduction ◽  
Small Reduction ◽  
Laminar And Turbulent Flow ◽  
Computational Fluid Dynamics Cfd

Non-axisymmetric profiled endwalls have been shown to reduce losses and secondary flow both in cascades and in rig tests. This paper presents experimental results which quantify the benefits of loss reduction in the cascade with particular attention to accuracy. The paper compares the benefits achieved in experiment to the results predicted by computational fluid dynamics (CFD). The results show that both the experiment and CFD give significant reductions in secondary flow. A reduction of 31 per cent in secondary loss has been measured for the best case, but the CFD gives only a small reduction in loss. Previous studies on the planar endwall have shown significant areas of transitional flow, so the surface flow has been studied with the aid of surface-mounted hot films. It was concluded that the loss reductions were not due to changes in regions of laminar and turbulent flow.

scholarly journals Reproducibility of Experiments With Swirling Flow: Numerical Prediction With Polynomial Chaos

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Alouette van Hove ◽  
Lasse N. Skov ◽  
Denis F. Hinz
Keyword(s):  
Fluid Dynamics ◽  
Polynomial Chaos ◽  
Swirling Flow ◽  
Flow Patterns ◽  
Velocity Fields ◽  
Good Reproducibility ◽  
Computational Fluid Dynamics Cfd ◽  
Computational Uncertainty ◽  
Flow Experiments ◽  
Inflow Conditions

Achieving good reproducibility in fluid flow experiments can be challenging, in particular in scenarios where the experimental boundary conditions are obscure. We use computational uncertainty quantification (UQ) to evaluate the influence of uncertain inflow conditions on the reproducibility of experiments with swirling flow. Using a nonintrusive polynomial chaos method in combination with a computational fluid dynamics (CFD) code, we obtain the expectation and variance of the velocity fields downstream from symmetric and asymmetric swirl disturbance generators. Our results suggest that the flow patterns downstream from the asymmetric swirl disturbance generator are more reproducible than the flow patterns downstream from the symmetric swirl disturbance generator. This confirms that the inherent breaking of symmetry eliminates instability mechanisms in the wake of the disturber, thereby creating more stable swirling patterns that make the experiments more reproducible.

Interaction Between Advanced Spar and Regular Waves

2017 ◽  
Author(s):  
Shingo Yamanaka ◽  
Takayuki Hirai ◽  
Yasunori Nihei ◽  
Akira Sou
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Pressure Distribution ◽  
Simulation Experiment ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Regular Waves ◽  
Experimental Database ◽  
Computational Fluid Dynamics Cfd ◽  
Good Agreement

Advanced spar type of the floating wind turbine with a short spar and a cylindrical column floater has been developed and tested recently. However, numerical methods to accurately simulate the interaction between the advanced spar and waves have not been established yet. In this study we simulated the free surface flow around an advanced spar in regular waves using open source computational fluid dynamics (CFD) software OpenFOAM to examine its applicability. We used olaFOAM which equipped with the functions to set the boundary conditions of wave generation at the inlet and wave absorption at the exit. An experiment of the advanced spar model fixed in space in the regular waves with various wave periods was also conducted to obtain an experimental database on the horizontal and vertical forces acting on the structure and pressure distribution on the floater surface. The results of the forces obtained by the numerical simulation, experiment, Morison’s equation were compared to examine the validity of the numerical model. Numerical and experimental results of the horizontal and vertical forces as well as pressure distribution on the floater surface were in good agreement, which confirmed the validity of the present numerical method. Then, we evaluated numerically the effects of the edge of the column by simulating a sharp-edged and a chamfered column floater. The result clarified that a chamfered edge decreased the wake which reduced the forces acting on the floater structure.

scholarly journals CFD Analysis of Double Suction Centrifugal Pump with Double Volute

2017 ◽  
Vol 62 (1) ◽  
pp. 74
Author(s):  
Pranav Vyavahare ◽  
Lokavarapu Bhaskara Rao ◽  
Nilesh Patil
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Centrifugal Pump ◽  
Operating Speed ◽  
Cfd Analysis ◽  
Pump Impeller ◽  
Ansys Cfx ◽  
Performance Curves ◽  
Computational Fluid Dynamics Cfd ◽  
Centrifugal Pump Impeller

In this study, Computational Fluid Dynamics (CFD) Analysis is used to investigate the flow in the centrifugal pump impeller using the ANSYS-CFX. Impeller is designed for head of 22 m, discharge of 52.239 m3/hr and for the operating speed of 2970 RPM. Impeller vane profile is generated by tangent arc method and CFD analysis is performed for 1st stage of vertical pump out of 15 stages. Velocity and pressure distribution are analysed for casing and impeller. Using ANSYS-CFX head developed by this impeller is calculated and compared with the required value. From results of CFD analysis, performance curves are plotted and compared with analytical performance curves. Results obtained from CFD nearly matches with analytical results. 

CFD Analysis on a Vortex Enhanced CVD Reactor Design

2001 ◽  
Vol 706 ◽  
Author(s):  
Kazunori Kuwana ◽  
Rodney Andrews ◽  
Eric A. Grulke ◽  
Kozo Saito
Keyword(s):  
Fluid Dynamics ◽  
Mass Transfer ◽  
Straight Tube ◽  
Cfd Analysis ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Multi Walled Carbon Nanotubes ◽  
New Type ◽  
Computational Fluid Dynamics Cfd ◽  
Walled Carbon Nanotubes

AbstractTo enhance the yield of multi-walled carbon nanotubes (MWNTs), a vortex enhanced CVD reactor (VECVD) design has more advantage over the conventional straight tube CVD. A computational fluid dynamics (CFD) code was applied to analyze heat and mass transfer processes to compare the conventional CVD design performance with a new type. The calculation showed that VECVD has a stronger and more uniform circulation along the reactor than the conventional CVD design.

Predicting Hydrodynamic and Heat Transfer Effects of Sparger Geometry and Placement Within a Column Photobioreactor Using Computational Fluid Dynamics

2014 ◽  
Vol 11 (3) ◽  
Author(s):  
Ghazi S. Bari ◽  
Taylor N. Suess ◽  
Gary A. Anderson ◽  
Stephen P. Gent
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Porous Membrane ◽  
Flow Patterns ◽  
Transfer Effects ◽  
Eulerian Approach ◽  
Cfd Models ◽  
Computational Fluid Dynamics Cfd ◽  
Heat Transfer Effects

This research investigates the effects of the sparger on flow patterns and heat transfer within a column photobioreactor (PBR) using computational fluid dynamics (CFD). This study compares two types of spargers: a porous membrane, which occupies the entire floor of the reactor, and a single sparger, which is located along the centerline of the PBR floor. The PBR is modeled using the Lagrangian–Eulerian approach. The objective of this research is to predict the performance of PBRs using CFD models, which can be used to improve the design of PBRs used to grow microalgae that are used to produce biofuels and bioproducts.

A New Design for SCWR Fuel Assemblies

2013 ◽  
Author(s):  
Donghua Lu ◽  
Jue Yang ◽  
Qianhua Su ◽  
Qinglong Wen
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
Cold Water ◽  
Fuel Rods ◽  
Rectangular Channels ◽  
Fuel Assemblies ◽  
New Type ◽  
Computational Fluid Dynamics Cfd ◽  
Water Reactors ◽  
Control Rods

A new type of fuel assemblies (FAs) was designed for super critical water reactors (SCWRs). A square FA is composed by 16 rectangular channels. Each channel has 26 fuel rods that are arranged into two rows and enclosed by thermal walls. The gap between each channel acts as water rods as usual design does. Flat absorbers are used as the control rods. They are placed in the gaps. Then computational fluid dynamics (CFD) was used to evaluate the design. The results show mixing vanes can lower the peak cladding temperature of fuel rods. The thermal wall between cold water rods and subchannels should be optimized to produce reasonable heat transfer.

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