Pumping Capacity of Pitched Blade Multi-Stage Impellers

2014 ◽  
Vol 35 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Tomáš Jirout
Keyword(s):  
Axial Velocity ◽  
Laser Doppler Anemometry ◽  
Velocity Profiles ◽  
Circulation Loop ◽  
Geometrical Parameters ◽  
Main Attention ◽  
Blade Number ◽  
Multi Stage ◽  
In Series ◽  
Close Distance

Abstract This paper extends knowledge about flow in an agitated batch with pitched blade multi-stage impellers. Effects of various geometrical parameters (blade number, distance between impellers) of pitched blade multi-stage impellers on pumping ability have been investigated. Axial velocity profiles were measured by LDA (Laser Doppler Anemometry). Axial pumping capacities were obtained by integration of measured axial velocity profiles in outflow from impellers. Main attention was focused on the effect of the distance between impellers in multi-stage configurations, on their pumping capacity and flow in the mixing bath in comparison with an independently operating pitched blade impeller with the same geometry. In case of a relatively close distance between impellers H3/d = 0.5 - 0.75, the multi-stage impeller creates only one circulation loop and the impellers itself behave identically as pumps in series. However for relative higher distance of impellers than H3/d = 1.25, the multi-stage impeller creates two separated circulation loops.

Development of a Numerical Model for Single- and Two-Phase Flow Simulation in Perforated Porous Media

2019 ◽  
Vol 142 (4) ◽  
Author(s):  
Hamed Movahedi ◽  
Mehrdad Vasheghani Farahani ◽  
Mohsen Masihi
Keyword(s):  
Porous Media ◽  
Fluid Flow ◽  
Transient Flow ◽  
Accurate Determination ◽  
Flow Simulation ◽  
Velocity Profiles ◽  
Geometrical Parameters ◽  
Reservoir Properties ◽  
Two Phase ◽  
Phase Fluid

Abstract In this paper, we present a computational fluid dynamics (CFD) model to perform single- and two-phase fluid flow simulation on two- and three-dimensional perforated porous media with different perforation geometries. The finite volume method (FVM) has been employed to solve the equations governing the fluid flow through the porous media and obtain the pressure and velocity profiles. The volume of fluid (VOF) method has also been utilized for accurate determination of the volume occupied by each phase. The validity of the model has been achieved via comparing the simulation results with the available experimental data in the literature. The model was used to analyze the effect of perforation geometrical parameters (length and diameter), degree of heterogeneity, and also crushed zone properties (permeability and thickness) on the pressure and velocity profiles. The two-phase fluid flow around the perforation tunnel under the transient flow regime was also investigated by considering a constant mass flow boundary condition at the inlet. The developed model successfully predicted the pressure drop and resultant temperature changes for the system of air–water along clean and gravel-filled perforations under the steady-state conditions. The presented model in this study can be used as an efficient tool to design the most appropriate perforation strategy with respect to the well characteristics and reservoir properties.

Estimation of volume flow in curved tubes based on analytical and computational analysis of axial velocity profiles

2009 ◽  
Vol 21 (2) ◽  
pp. 023602 ◽  
Author(s):  
A. C. Verkaik ◽  
B. W. A. M. M. Beulen ◽  
A. C. B. Bogaerds ◽  
M. C. M. Rutten ◽  
F. N. van de Vosse
Keyword(s):  
Axial Velocity ◽  
Computational Analysis ◽  
Velocity Profiles ◽  
Volume Flow

An Optimization Design of the Auxiliary Impeller of Centrifugal Pumps Based on Orthogonal Methods

2011 ◽  
Author(s):  
Jianping Yuan ◽  
Rong Jin ◽  
Shujuan Li ◽  
Longyan Wang ◽  
Aixiang Ge
Keyword(s):  
Centrifugal Pump ◽  
Optimization Design ◽  
Geometrical Parameters ◽  
Pump Efficiency ◽  
Centrifugal Pumps ◽  
Blade Number ◽  
Operation Conditions ◽  
Axial Clearance ◽  
Sealing Pressure ◽  
Orthogonal Tests

In order to research the influence laws of the main geometrical parameters of auxiliary impeller and different operation conditions on the centrifugal pump with an auxiliary impeller, which aimed to act as dynamic seal, the orthogonal experiment was designed with four factors and three values. The factors respectively are auxiliary impeller axial clearance, blade width, outlet diameter and blade number. With simulation by Fluent, major and minor factors were investigated which influence the performance of the centrifugal pump with an auxiliary impeller. The cases with optimization sealing pressure value and optimization efficiency were obtained and it was proved by the experimental results. Then, two optimization cases and the original case were simulated and analyzed. The research results show that the major factor of auxiliary impellers for the pump efficiency is the outlet diameter. For sealing pressure head of auxiliary impellers, the major factor is the outlet diameter of auxiliary impeller and the axial clearance and blade number of the auxiliary impeller are secondary important factors. For the optimization of centrifugal pumps with an auxiliary impeller, numerical orthogonal tests can replace actual orthogonal tests.

Steady Flow Through a Double Converging-Diverging Tube Model for Mild Coronary Stenoses

1989 ◽  
Vol 111 (3) ◽  
pp. 212-221 ◽  
Author(s):  
S. C. van Dreumel ◽  
G. D. C. Kuiken
Keyword(s):  
Pressure Drop ◽  
Reynolds Numbers ◽  
Velocity Profiles ◽  
Tube Model ◽  
Mean Flow ◽  
Number Range ◽  
Low Reynolds Numbers ◽  
In Series ◽  
Coronary Stenoses ◽  
Converging Angle

Velocity profiles and the pressure drop across two mild (62 percent) coronary stenoses in series have been investigated numerically and experimentally in a perspex-tube model. The mean flow rate was varied to correspond to a Reynolds number range of 50–400. The pressure drop across two identical (62 percent) stenoses show that for low Reynolds numbers the total effect of two stenoses equals that of two single stenoses. A reduction of 10 percent is found for the higher Reynolds numbers investigated. Numerical and experimental results obtained for the velocity profiles agree very well. The effect of varying the converging angle of a single mild (62 percent) coronary stenosis on the fluid flow has been determined numerically using a finite element method. Pressure-flow relation, especially with respect to relative short stenoses, is discussed.

Separation of Azeotropic Mixture Using Multi-stage Ultrasound-Assisted Flash Distillation

2015 ◽  
Vol 10 (4) ◽  
pp. 237-242 ◽  
Author(s):  
Taha Mahdi ◽  
Arshad Ahmad ◽  
Adnan Ripin ◽  
Mohamed Mahmud Nasef
Keyword(s):  
Ethyl Acetate ◽  
Azeotropic Mixture ◽  
Separation Unit ◽  
Multi Stage ◽  
Azeotropic Mixtures ◽  
In Series ◽  
Flash Distillation ◽  
Ultrasound Assisted ◽  
Aspen Custom Modeler

Abstract A mathematical model for an ultrasound-assisted vapor liquid equilibrium (VLE) system developed in Aspen Custom Modeler is exported to Aspen Plus flowsheeting environment to form a block in the software library to represent a single stage flash separation unit. The block is then arranged in series to mimic an ultrasonically intensified distillation process. As a case study, an ethanol/ethyl acetate separation process is examined. The results show that a 99 mol% ethyl acetate recovery is established when a series of 27 flash VLE devices are used. The system is also evaluated for other minimum boiling azeotropic mixtures, and consistent results are obtained, thus revealing the potentials of ultrasound-assisted system as an alternative strategy for azeotropic mixture separations.

Fabrication and Performance of a Double-Chamber Serial Piezoelectric Micropump

2013 ◽  
Vol 655-657 ◽  
pp. 1164-1168 ◽  
Author(s):  
Fang Sheng Huang ◽  
Jun Wu Kan ◽  
Zhong Hua Zhang ◽  
Ze Hui Ma ◽  
Shu Yun Wang ◽  
...  
Keyword(s):  
Geometrical Parameters ◽  
Pump Performance ◽  
Output Performance ◽  
Working Medium ◽  
In Series ◽  
Chamber Pump ◽  
And Performance ◽  
Double Chamber

A double-chamber PZT micropump with two PZT actuators and three cantilever valves is introduced. When the PZT actuators work in anti-phase, the output performance of the pump is equal to that of two one-chamber pump running in series. Besides, the pump performance depends on the characteristic and geometrical parameters of the PZT actuators. A prototype double-chamber serial micropump is fabricated with the PZT membrane of 0.2mm in thick and 15mm in diameter. The pump was tested with water as the working medium. The testing results show that both the flowrate and backpressure of the micropump with two chambers running are about 1.54 and 1.8 times those with one chamber running, respectively. With two chamber running, the achieved maximum flowrate is up to 3.85ml/min at 50V and 150Hz, and the maximum backpressure is about 34.2kPa at 50V and 180Hz.

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