The Critical Pressure for Bulk Leakage of Non-planar Smooth Surfaces

Huang, De; Xiang, Yan; Larsson, Roland; Almqvist, Andreas

doi:10.1007/s11249-022-01617-z

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…The ratio between p b and the average applied pressure p 0 firstly increases with pes , and slightly decrease with further growth of pes . The decrease of p b /p 0 with the average applied pressure p 0 is consistent with the line contact problem studied in [29].…”

Section: Critical Quantities With Hydrostatic Loadsupporting

confidence: 86%

“…and κ y increases with α. The higher curvature of the initial gap results in lager maximum contact pressure and steeper contact pressure distribution under the same total load condition, and the fluid front is harder to proceed with elevated hydrostatic pressure [29].…”

Section: Critical Quantities With Hydrostatic Loadmentioning

confidence: 99%

“…To further the understanding of the critical pressure ratio p b /p 0 , a dimensionless parameter Λ is introduced as the critical pressure factor following [29]:…”

Section: Critical Quantities With Hydrostatic Loadmentioning

confidence: 99%

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Leakage threshold of a saddle point

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et al. 2022

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The threshold condition for leakage inception is of great interest to many engineering applications, and it is essential for seal design. In the current study, the leakage threshold is studied by means of a numerical method for a mechanical contact problem between an elastic bisinusoidal surface and a rigid flat surface. The coalesce process of the contact patches is first investigated, and a generalized form of solution for the relation between the contact area ratio and the average applied pressure is acquired. The current study shows that the critical value of the average applied pressure, required to close the percolation path, can be represented as a power law of a shape parameter if the effect of the hydrostatic load from the pressurized fluid is ignored. With contact patches merged under a constant applied load, the contact breakup process is investigated under elevated sealed fluid pressure conditions, and it is shown that the leakage threshold is a function of the excess pressure, which is defined as a ratio between the average applied pressure and the critical pressure under dry contact conditions.

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Section: Critical Quantities With Hydrostatic Loadsupporting

confidence: 86%

Section: Critical Quantities With Hydrostatic Loadmentioning

confidence: 99%

See 1 more Smart Citation

Leakage threshold of a saddle point

Huang

Xiang

Larsson

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

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Leakage Threshold of a Saddle Point

et al. 2023

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The threshold condition for leakage inception is of great interest to many engineering applications, and it is essential for seal design. In the current study, the leakage threshold is studied by means of a numerical method for a mechanical contact problem between an elastic bi-sinusoidal surface and a rigid flat surface. The coalesce process of the contact patches is first investigated, and a generalized form of solution for the relation between the contact area ratio and the average applied pressure is acquired. The current study shows that the critical value of the average applied pressure and the corresponding contact area required to close the percolation path can be represented as a power law of a shape parameter, if the effect of the hydrostatic load from the pressurized fluid is ignored. With contact patches merged under a constant applied load, the contact breakup process is investigated with elevated sealed fluid pressure condition, and it is shown that the leakage threshold is a function of the excess pressure, which is defined as a ratio between the average applied pressure and the critical pressure under dry contact conditions. Graphical abstract

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Topographic variation and fluid flow characteristics in rough contact interface

Ji,

Sun,

et al. 2024

Friction

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Understanding flow characteristics of fluid near rough contact is important for the design of fluid-based lubrication and basic of tribology physics. In this study, the spreading and seepage processes of anhydrous ethanol in the interface between glass and rough PDMS are observed by a homemade optical in-situ tester. Digital image processing technology and numerical simulation software are adapted to identify and extract the topological properties of interface and thin fluid flow characteristics. Particular attention is paid to the dynamic evolution of the contact interface morphology under different stresses, the distribution of microchannels in the interface, the spreading characteristics of the fluid in contact interface, as well as the mechanical driving mechanism. Original surface morphology and the contact stress have a significant impact on the interface topography and the distribution of interfacial microchannels, which shows that the feature lengths of the microchannels, the spreading area and the spreading rate of the fluid are inversely proportional to the load. And the flow path of the fluid in the interface is mainly divided into three stages: along the wall of the island, generating liquid bridges, and moving from the tip side to the root side in the wedge-shaped channel. The main mechanical mechanism of liquid flow in the interface is the equilibrium between the capillary force that drives the liquid spreading and viscous resistance of solid wall to liquid. In addition, the phenomenon of “trapped air” occurs during the flow process due to the irregular characteristics of the microchannel. This study lays a certain theoretical foundation for the research of microscopic flow behavior of the liquid in the rough contact interface, the friction and lubrication of the mechanical system, and the sealing mechanism.

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The Critical Pressure for Bulk Leakage of Non-planar Smooth Surfaces

Cited by 4 publications

References 31 publications

Leakage threshold of a saddle point

Leakage threshold of a saddle point

Leakage Threshold of a Saddle Point

Topographic variation and fluid flow characteristics in rough contact interface

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