Effect of slip position on the hydrodynamic performance of liquid film seal

Wang, Yunlei; Wu, Jiu Hui; Li, Zhentao; Xu, Liang

doi:10.1108/ilt-03-2020-0082

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…The key performance parameters of metal seals, including the liquid film bearing coefficient K f , leakage rate Q, and frictional force F f , can be expressed as [44]…”

Section: Performance Parametersmentioning

confidence: 99%

Multi-Field Coupling Numerical Analysis and Experimental Validation of Surface-Textured Metal Seals in Roller Cone Bits

Ma,

Li,

Yuan

et al. 2024

Lubricants

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Metal seals play a crucial role in ensuring the dependable functioning of the bearing system in roller cone bits. Due to the intricate nature of downhole conditions, the microstructure design of sealing end faces, specifically the surface texture, is rarely used in metal seals. This study focuses on examining the applicability of surface texture technology in metal seals for cone bits to enhance the lubrication characteristics and friction and wear properties of liquid film between end faces. A multi-field coupling model of surface-textured metal seals was established and experimentally verified. The liquid film carrying the capacity and sealing performance of five different shapes of surface-textured end faces (circle, ellipse I (horizontal), ellipse II (vertical), triangle, and chevron) were investigated under varying rotational speeds and environmental pressures. The influences of texture parameters, including depth and area ratio, on the lubrication characteristics and friction reduction effects of surface-textured metal seals were investigated, and the microscopic wear morphology characteristics of the sealing end faces were analyzed. The results show that surface textures can effectively improve the liquid film state and comprehensive performance of metal seals. Specifically, triangle textures significantly enhance the hydrodynamic pressure effect and weaken the abrasive wear and adhesive wear of the end faces. However, when the environmental pressure is p ≥ 30 MPa, the surface textures gradually lose the advantages of dynamic lubrication but can still reduce friction. The proper texture depth and area ratio can achieve zero leakage (obtained theoretically) and minimal friction in metal seals.

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“…The key performance parameters of metal seals, including the liquid film bearing coefficient K f , leakage rate Q, and frictional force F f , can be expressed as [44]…”

Section: Performance Parametersmentioning

confidence: 99%

Multi-Field Coupling Numerical Analysis and Experimental Validation of Surface-Textured Metal Seals in Roller Cone Bits

Ma,

Li,

Yuan

et al. 2024

Lubricants

View full text Add to dashboard Cite

show abstract

Optimization design for slip/no-slip configuration of hydrophobic sliding bearings using Monte Carlo search

Zhang

Zhu²

2023

Tribology International

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Modeling Non-Newtonian fluid flow through pipes with slip boundary conditions

Radulescu

Radulescu²

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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In recent years, the development of nanotechnologies has led to the emergence of multifunctional materials, with different properties of the surface layer from the base layer, namely with hydrophobic properties. Multidisciplinary research in physics and chemistry has also resulted in the emergence of fluids with special properties, such as aqueous solutions in combination with polymers or silicone oils. For such cases of couples of solid-liquid materials, the researchers found that in the area of contact of the liquid with the immobile wall, the condition of adhesion of the liquid to the wall is no longer observed. Consequently, the general theory of lubrication, based on Reynolds’ equation, can no longer correctly model the lubrication processes that occur at the interface between material and fluid. The present paper investigates the flow of the non-Newtonian fluids in a circular pipe with slip boundary conditions, being obtained as main result the velocity profile and the flow rate characteristic for a power-law fluid. At the end it was made a comparison of the obtained model with the experimental results regarding the flow of fluids in channels, for different values of the slip coefficient.

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Effect of slip position on the hydrodynamic performance of liquid film seal

Cited by 3 publications

References 20 publications

Multi-Field Coupling Numerical Analysis and Experimental Validation of Surface-Textured Metal Seals in Roller Cone Bits

Multi-Field Coupling Numerical Analysis and Experimental Validation of Surface-Textured Metal Seals in Roller Cone Bits

Optimization design for slip/no-slip configuration of hydrophobic sliding bearings using Monte Carlo search

Modeling Non-Newtonian fluid flow through pipes with slip boundary conditions

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