Computational fluid dynamics−discrete element method simulation and experimental study of particle transport mechanism in a centrifugal pump

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(2)

Published: Feb. 1, 2025

Pumps are one of the most important equipment in deep-sea mining system, which transport particles continuously from seafloor. In this paper, computational fluid dynamics−discrete element method (CFD−DEM) numerical simulation was used to analyze effect particle volume fraction (PVF) on mechanism pump. The reliability CFD−DEM verified by high-speed photography experiments. results show that mainly move along blade pressure surface (BPS) impeller, and can suppress formation low-velocity vortices BPS. translational velocity is less affected PVF, but has a significant rotational velocity. flow pattern inside volute categorized into wake flow, cutting near wall flow. With increase subjected gradient force, drag virtual mass force pump gradually increase, lift decreases. tangential normal between increased with increasing PVF 2% 10% 462.55% 148.17%, respectively. collision frequency per unit time largest, area largest for impeller. impact work blades 371.08% 505.66% when increases 10%. This study provide theoretical guidance optimal design solid−liquid two-phase pumps.

Language: Английский

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Experimental measurement of particle flow and energy performance in a centrifugal pump

Flow Measurement and Instrumentation, Journal Year: 2025, Volume and Issue: unknown, P. 102920 - 102920

Published: April 1, 2025

Language: Английский

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Energy dissipation of solid–liquid flow in a centrifugal pump based on an improved four-way coupling method

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(1)

Published: Jan. 1, 2025

To investigate the energy dissipation mechanisms within pump and improve computational accuracy of solid–liquid flow numerical simulations, in this study, an improved CFD-DEM (Computational Fluid Dynamics - Discrete Element Method) method has been presented. First, is introduced, which mainly considers turbulent particles near-wall region velocity field reconstruction. Then, simulation results before after method's enhancement are compared. Finally, analysis characteristics liquid phase conducted. Research shows that modified significantly improves particle distribution predictions, with for head efficiency being much closer to experimental values. In high-speed regions impeller field, primarily located behind pressure side blades, fluctuations less affected by changes solid concentration. fluid centrifugal pump, loss caused entropy production concentrated volute regions. Specifically, accounts substantial portion total production, approximately 67%–68%, while about 19.7%–20.4%. As concentration increases, gradually rises, vorticity at inlet also increases correspondingly, related number blades. The findings provide a reference further exploring pumps.

Language: Английский

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Blade wear intensity of a centrifugal pump based on an improved four-way coupling method

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(4)

Published: April 1, 2025

To accurately study the effect of particle density on wear characteristics centrifugal pumps, improvements have been made to four-way coupling method. This paper first introduces enhancement strategy for method, focusing turbulence dissipation near wall and reconstruction velocity field. It then investigates pump finally explores interactions between particles. found that as increases, also increases accordingly. Wear primarily occurs pressure side blades, rear cover plate impeller, walls volute. The collision intensity particles blade is significantly affected by with being higher than suction side. As sliding distance gradually decreases. both impeller volute impact particularly significant. rises, gradient force acting there a positive correlation wear. energy loss resulting from collisions density, but rate increase in slows down continues rise. results provide reference further solid–liquid flow pump.

Language: Английский

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Impact of impeller wake on the energy fluctuation characteristics of centrifugal pumps under rotating stall condition

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(12)

Published: Dec. 1, 2024

To reveal the impact of impeller wake flow on internal energy fluctuation centrifugal pump, in this study, performance and structures pumps under various operating conditions have been thoroughly analyzed by combining numerical simulations with experimental validation. The results indicate that simulation are highly consistent data terms head efficiency, an error less than 5%, demonstrating high accuracy simulations. Further investigation reveals a significant increase entropy production loss critical deep stall conditions, primarily concentrated blade volute tongue interference region. Analysis maps pressure fluctuations different shows breakup vortices their interaction main causes values. Coherence studies low-frequency range bidirectional mechanism between two. Overall, study provides important theoretical support for understanding mechanisms complex conditions.

Language: Английский

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