Slip Factor for Centrifugal Impellers Under Single and Two-Phase Flow Conditions (2025)

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Volume 127, Issue 2

March 2005

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Technical Papers

José A. Caridad,

José A. Caridad

Laboratorio de Conversión de Energía Mecánica,

Universidad Simón Bolívar

, Caracas, Venezuela

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Frank Kenyery

Frank Kenyery

Laboratorio de Conversión de Energía Mecánica,

Universidad Simón Bolívar

, Caracas, Venezuela

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Author and Article Information

José A. Caridad

Laboratorio de Conversión de Energía Mecánica,

Universidad Simón Bolívar

, Caracas, Venezuela

Frank Kenyery

Laboratorio de Conversión de Energía Mecánica,

Universidad Simón Bolívar

, Caracas, Venezuela

J. Fluids Eng. Mar 2005, 127(2): 317-321 (5 pages)

Published Online: October 12, 2004

Article history

Received:

February 18, 2004

Revised:

October 12, 2004

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Caridad, J. A., and Kenyery, F. (October 12, 2004). "Slip Factor for Centrifugal Impellers Under Single and Two-Phase Flow Conditions." ASME. J. Fluids Eng. March 2005; 127(2): 317–321. https://doi.org/10.1115/1.1891153

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Throughout the history of turbomachines investigators have tried to develop reliable methods for prediction of centrifugal pump behavior. Among the parameters available to estimate the performance of this kind of machine is the slip factor. In spite of being regarded as a variable of great significance in the analysis of turbomachinery, there seem to be a misconception regarding its concept and application. Indeed, empirical correlations have been widely used to estimate the slip factor, even in the case of two-phase flow applications, where it has not been investigated. Moreover, these correlations provide a constant value of the slip factor for a given impeller only at the best efficiency point, which is an important restriction to the pump performance prediction, considering that slip factor varies with the pump flow rate. In this study, three-dimensional computational fluid dynamics simulations were carried out on an impeller of known geometry (NS=1960) from which values of slip factor were calculated for both single- and two-phase flow (water and water-air). These results include curves of the slip factor as a function of the specific capacity and the gas-void fraction. Additionally, results for the slip factor in the case of single-phase flow (water) are given for various centrifugal impellers (NS=1157, 1447, 1612, and 3513) in order to illustrate the influence of the flow rate on this parameter. Finally, based on the numerical results, a methodology for prediction of the pump head is presented. Excellent agreement with experimental results has been found. This paper attempts to contribute to a better understanding of the fluid dynamics within centrifugal pump impellers and to shed more light on the path that prediction models should follow in the future.

Issue Section:

Technical Papers

Keywords:

slip flow, impellers, two-phase flow, turbomachinery, pumps, computational fluid dynamics, flow simulation

Topics:

Centrifugal pumps, Flow (Dynamics), Impellers, Pumps, Two-phase flow, Computational fluid dynamics, Turbomachinery

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byAmerican Society of Mechanical Engineers

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