Influence of thermodynamic effect on cavitation in screw and screw centrifugal pumps

1981 ◽  
Vol 17 (8) ◽  
pp. 415-421
Author(s):  
L. E. Shcherbatenko ◽  
A. S. Shapiro
Keyword(s):  
Centrifugal Pumps ◽  
Thermodynamic Effect

Correlation of Cavitating Centrifugal Pumps

1984 ◽  
Vol 106 (2) ◽  
pp. 141-146 ◽  
Author(s):  
V. J. Zika
Keyword(s):  
Narrow Band ◽  
Centrifugal Pumps ◽  
Cavitation Process ◽  
New Methods ◽  
Thermodynamic Effect ◽  
Variable Nature ◽  
Test Points ◽  
Actual Test

The foreknowledge of the minimum NPSH (“net positive suction head”) required for a cavitation-free performance of centrifugal pumps is important for a safe and sound operation of these machines. The required NPSH varies from pump to pump, from fluid to fluid, and from temperature to temperature of the pumped fluid. This is known as the thermodynamic effect. The methods currently used for the correlation and analysis of this condition are not always reliable because of the multi-variable nature of the cavitation process. In this paper, two new methods are proposed which lead to more consistent correlations of the required minimum NPSH; thus they can also be used for more dependable predictions of the net positive suction head for any pump, fluid and temperature. The predictions by the two methods do not coincide, but outline a narrow band of probability, within which the actual test points are invariably located.

Short-term hemodynamic support with bearingless, magnetically levitated paracorporal centrifugal pumps

2009 ◽  
Vol 56 (S 01) ◽  
Author(s):  
JFM Bechtel ◽  
EI Charitos ◽  
T Hanke ◽  
M Misfeld ◽  
C Schmidtke ◽  
...  
Keyword(s):  
Centrifugal Pumps ◽  
Short Term ◽  
Hemodynamic Support ◽  
Magnetically Levitated

Withdrawal: New Impeller Shrouds to Improve Hydrodynamic Performance of Centrifugal Pumps: Experimental and Numerical Evaluations

2020 ◽  
Author(s):  
Hamidreza Bozorgasareh ◽  
Mohammad Jafari ◽  
Javad Khalesic ◽  
Heshmat Olah Gazori ◽  
Mostafa Hassanalian
Keyword(s):  
Hydrodynamic Performance ◽  
Centrifugal Pumps

General model to predict performance degradation in centrifugal pumps.

2016 ◽  
Author(s):  
Edgar Ofuchi ◽  
Ana Leticia Lima Santos ◽  
Thiago Sirino ◽  
Henrique Stel ◽  
Rigoberto Morales
Keyword(s):  
General Model ◽  
Performance Degradation ◽  
Centrifugal Pumps

Effect of semi-open impeller side clearance on centrifugal pump cavitation inception

2018 ◽  
Vol 1 (2) ◽  
pp. 24-39
Author(s):  
A. Farid ◽  
A. Abou El-Azm Aly ◽  
H. Abdallah
Keyword(s):  
Centrifugal Pump ◽  
Static Pressure ◽  
Rotation Speed ◽  
Centrifugal Pumps ◽  
Severe Condition ◽  
Cavitation Inception ◽  
Total Input ◽  
Input Pressure ◽  
Pump Head ◽  
Pump Pressure

Cavitation in pumps is the most severe condition that centrifugal pumps can work in and is leading to a loss in their performance.  Herein, the effect of semi-open centrifugal pump side clearance on the inception of pump cavitation has been investigated.  The input pump pressure has been changed from 80 to 16 kPa and the pump side clearance has been changed from 1 mm to 3 mm at a rotation speed of 1500 rpm. It has been shown that as the total input pressure decreased; the static pressure inside the impeller is reduced while the total pressure in streamwise direction has been reduced, also the pump head is constant with the reduction of the total input pressure until the cavitation is reached. Head is reduced due to cavitation inception; the head is reduced in the case of a closed impeller with a percent of 1.5% while it is reduced with a percent of 0.5% for pump side clearance of 1mm, both are at a pressure of 20 kPa.   Results also showed that the cavitation inception in the pump had been affected and delayed with the increase of the pump side clearance; the cavitation has been noticed to occur at approximate pressures of 20 kPa for side clearance of 1mm, 18 kPa for side clearances of 2mm and 16 kPa for 3mm.

THE METHOD OF THE DISK FRICTION DETERMINING OF LOW MASS FLOW CENTRIFUGAL PUMPS

2019 ◽  
Vol 20 (2) ◽  
pp. 219-227 ◽  
Author(s):  
A. A. Zuev ◽  
◽  
V. P. Nazarov ◽  
A. A. Arngold ◽  
I. M. Petrov ◽  
...  
Keyword(s):  
Mass Flow ◽  
Centrifugal Pumps ◽  
Disk Friction ◽  
Low Mass
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