Effect of Rotation Speed and Flow Rate on Slip Factor in a Centrifugal Pump

Chen, Bo; Song, Baolin; Tu, Bicheng; Zhang, Yiming; Li, Xiaojun; Li, Zhigang; Zhu, Zuchao

doi:10.1155/2021/6614981

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…The effect of temperature, which associated with a reduction in liquid density, is the expansion of molecules within the fluid. As the result of the reduction in density, the hydrostatic pressure at the suction port decreases and makes the differential pressure between suction and discharge port rise [37]. Although the density at room temperature for HTF 3 , HTF 4 and HTF 5 is lower than HTF 1 and HTF 2 , the effect of increment on HTF 3 , HTF 4 and HTF 5 is negligible.…”

Section: Slip Factor and Volumetric Efficiencymentioning

confidence: 99%

Experimental investigation on the effect of thermophysical properties of a heat transfer fluid on pumping performance for a convective heat transfer system

Rahman

Suwandi

Nurtanto

2021

Journal of Thermal Engineering

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limited study that specifically discusses the relation between thermophysical properties of a Heat Transfer Fluid (HTF) and pumping performance. This study aims to find the effect of the change in thermophysical properties of HTF on the pumping performance, particularly for the delivery rate, slip factor coefficient, and volumetric efficiency. In this study, five different HTFs are used to assess the effect of working temperature and pumping speed on the pumping performance. Delivery rate is evaluated by setting the pumping speed from 0 to 1300 RPM where the working fluid temperature is set at 40, 140, and 200 °C. It shows that the HTF with a lower viscosity has a better delivery rate. The slip coefficient for all working fluid is ranging between 0.11–0.31 at temperature 200 °C. It is found that a higher working temperature for the fluid increases the slip coefficient and delivery rate. The volumetric efficiency is directly affected by the slip ranging from 69 – 89% at 200 °C. The heat transfer rate ranges from 40 – 98 °C for all fluids, which is mainly affected by the volumetric efficiency of the pump and also pumping speed where a higher pumping speed decreases the heat transfer rate. It can be concluded that the change in thermophysical properties of the working fluid will change the pumping performance. Therefore, it is important to adjust the pumping operation according to the temperature and properties of the working fluid to achieve the highest heat transfer rate for a convective heat transfer system.

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Section: Slip Factor and Volumetric Efficiencymentioning

confidence: 99%

Experimental investigation on the effect of thermophysical properties of a heat transfer fluid on pumping performance for a convective heat transfer system

Rahman

Suwandi

Nurtanto

2021

Journal of Thermal Engineering

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“…The internal flow of the stay vane volute pump belongs to supercritical Reynolds number flow, and its fluid inertia force is far greater than the fluid viscous force [6,7]. The fluid movement presents a state of changeable turbulent flow, which has complex characteristics such as incompressible viscosity, multi-scale, non-uniform, unsteady, strong shear, rotation and interference [8][9][10]. In terms of external characteristics, to accommodate the seasons, regions and head section of the water transmission change, the operating condition of the stay vane volute pump become extremely complicated.…”

Section: Introductionmentioning

confidence: 99%

Research on Radial Force of the Volute Pump with Stay Vanes at Medium-high Specific Speed

Zhang,

Feng,

et al. 2024

J. Phys.: Conf. Ser.

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In this paper, to study unsteady hydraulic excitation characteristics of the impeller in stay vane volute pump, the radial force of that is investigated by vector analysis, time-frequency analysis and unsteady flow field analysis etc. Results show that the radial force distribution on the impeller has a linear relationship with the number of the blade under high flow conditions. Furthermore, the radial force has obvious directivity under low flow conditions. The radial force of the impeller is mainly distributed on the blade and the shroud. Interestingly, it is found that the radial force on the impeller is smaller than the radial force on the blade and shroud respectively, when there are cross peaks between the blade and the shroud. In addition, the results of the unsteady flow field analysis reveal that the radial force distribution of the impeller is unbalanced under low flow conditions. This result is due to the fact that jet wake forms at the impeller outlet and radial vortex leads to rotating stall in the flow channel. This work may provide some theoretical references for the optimal design and stable operation of the stay vane volute pump.

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“…According to the different literature source various definitions of slip factor can be seen, but two of them are recognized as main ones. According to one of these two definitions, mainly used in the US, the slip factor is determined by the equation [2]:…”

Section: Introductionmentioning

confidence: 99%

Studying the variation of the slip factor when trimming the impeller of centrifugal pumps

Klimentov

Nikolova

Popov

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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It is well-known that one of the reasons for reducing the head of a centrifugal pump, when trimming its impeller, is the reduction of the slip factor. There are various methods used to determine it, but there is lack of information on whether they are applicable in case that a pump with a trimmed impeller operates. In the present work, a comparative experimental study concerning the applicability of some of the methods used to determine the slip factor, on two centrifugal pumps with different specific speed of rotation, is performed. Based on the experimental data, CFD models of the impellers of the two pumps have been validated and a numerical simulation study concerning the change of the slip factor during trimming, has also been performed. The impact of the rate of impeller trimming on the the slip factor variation has also been established. Based on the results found, concerning the performed numerical study, equations describing the relationship between the slip factor and the rate of trimming of the studied pumps are obtained.

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Effect of Rotation Speed and Flow Rate on Slip Factor in a Centrifugal Pump

Cited by 3 publications

References 32 publications

Experimental investigation on the effect of thermophysical properties of a heat transfer fluid on pumping performance for a convective heat transfer system

Experimental investigation on the effect of thermophysical properties of a heat transfer fluid on pumping performance for a convective heat transfer system

Research on Radial Force of the Volute Pump with Stay Vanes at Medium-high Specific Speed

Studying the variation of the slip factor when trimming the impeller of centrifugal pumps

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