A Compressible Porous Media Model to Estimate Fluid Leak Through a Metal–Elastomer Interface

Sudhamsu, Kambhammettu Sri Krishna; Deshpande, Abhijit P.; Rao, C. Lakshmana

doi:10.1007/s11242-020-01507-9

Cited by 7 publications

(3 citation statements)

References 33 publications

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“…However, these empirical correlations are often not scalable and are only applicable to a very narrow context. Other researchers have utilized theoretical leakage rate models for sealing interfaces [ 24 , 25 ]. The main cause of fluid leakage is the presence of fine leakage channels at the sealing interface.…”

Section: Introductionmentioning

confidence: 99%

A Leakage Prediction Model for Sealing Performance Assessment of EPDM O-Rings under Irradiation Conditions

Huang

et al. 2023

Polymers

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In this work, a model for predicting the leakage rate was developed to investigate the effect of irradiation on the sealing performance of ethylene propylene diene monomer (EPDM) O-rings. The model is based on a mesoscopic interfacial gap flow simulation and accurately predicts the sealing performance of irradiated and non-irradiated materials by utilizing the gap height as an indicator in a mechanical simulation of the O-ring under operating conditions. A comparison with vacuum test results indicates that the model is a good predictor of leak initiation. The positive pressure leakage of the O-rings was investigated numerically. The results show the following. The sealing performance of the non-irradiated O-ring is much better than that of the irradiated one. The sealing performance is the worst at 0. 713 MGy and the best at 1.43 MGy, and the seal is maintained at an absorbed dose of 3.55 MGy. A theoretical analysis of the non-monotonic variation using the proposed model shows that the leakage behavior of the O-rings depends not only on the material properties but also on the roughness and prestressing properties. Finally, a method was proposed to classify the sealing performance, using the maximum allowable leakage rate as an indicator.

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Section: Introductionmentioning

confidence: 99%

A Leakage Prediction Model for Sealing Performance Assessment of EPDM O-Rings under Irradiation Conditions

Huang

et al. 2023

Polymers

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“…e metal-to-metal seal is performed by a direct-metal/ metal-tight contact of rough surfaces as shown in Figure 1. Although it is simple in structure, the sealing behavior of a metal-to-metal seal is a ected by a variety of factors [7][8][9][10][11], among which the surface topography, which usually has a microstructure given by machining processes, is thought to be one of the most important factors [12][13][14]. Clearly, engineering materials are known to have rough surfaces, and the full control of surface topography at all scales during manufacturing processes is still out of reach [9].…”

Section: Introductionmentioning

confidence: 99%

A Fractal Contact Model for Rough Surfaces considering the Variation of Critical Asperity Levels

Liu

Guo

Chen

et al. 2022

Advances in Materials Science and Engineering

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A contact model for rough surfaces based on the fractal theory is proposed in the present work. Firstly, the deformation of the material is divided into four stages: elastic deformation, the first elastoplastic deformation, the second elastoplastic deformation, and full plastic deformation. And the variation of material hardness is considered when analyzing the contact characteristics of a single asperity within the first and second elastoplastic deformation stages. Secondly, the size distribution function of contact spots at different frequency levels is derived. And the expressions of asperity critical frequency levels are rederived. Lastly, the feasibility and credibility of the proposed model are verified by comparison with other contact models and experimental data. The results show that when the variation of the material hardness is considered, the contact area of a single asperity in the first elastoplastic deformation stage becomes larger, while the contact area of a single asperity in the second elastoplastic deformation stage becomes smaller. Moreover, the critical asperity frequency levels of the rough surface are not constant, but the variables are related to the total real contact area of the rough surface and decrease as the real contact area increases. The proposed model is a modification and improvement of the existing fractal contact models, which can lead to a more accurate relationship between the contact load and the total real contact area of the rough surface.

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“…Afrasiabi et al [22] presented a particle-based numerical solver, applicable to the simulation of heat transfer in multiphase immiscible flows including surface tension and presented a novel coupling of three state-of-the-art particle methods, capable of simulating heat transfer in multiphase flows with minimum error [23]. Kambhammettu et al [24] proposed a relationship to account for change in the permeability and the thickness of the seal interface with contact pressure at the interface and fluid pressure of fluid flowing through the interface and developed a porous-media-based model to describe gas leaking through the metal-elastomer interface.…”

Section: Introductionmentioning

confidence: 99%

A Porous Media Leakage Model of Contact Mechanical Seals Considering Surface Wettability

Bei

Sun

et al. 2021

Coatings

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The fluid leakage channel found in contact mechanical seals belongs to the microchannel category. Thus, upon further inspection, the influence of surface wettability and other factors neglected in previous studies becomes obvious. The porous leakage model of contact mechanical seals considering the surface wettability presented in this paper was based on the Cassie model and slip theory. The variations of the microchannel slip length and the velocity under various wettability conditions were studied and the relationship between the slip length and the apparent contact angle was established. Moreover, using porous media theory, the theoretical model of the leakage rate in contact mechanical seals considers the surface wettability depending on various parameters. The observed parameters included the surface contact angle, sealing medium pressure, viscosity coefficient, fractal dimension, and maximum pore diameter. The simulation results obtained using the proposed model have shown that the leakage rate increases with the increase of the apparent contact angle. Particularly when the contact pressure is small, the influence of the surface wettability is more significant. Furthermore, the leakage rate results obtained via the proposed model were compared to those of existing models. The comparison confirmed that the proposed model is applicable and that the necessity of considering wettability significantly affects the leakage rate calculation accuracy. The proposed model lays a foundation for further improving the calculation accuracy, making it easier for both the researchers and practitioners to suppress the leakage in contact mechanical seals.

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A Compressible Porous Media Model to Estimate Fluid Leak Through a Metal–Elastomer Interface

Cited by 7 publications

References 33 publications

A Leakage Prediction Model for Sealing Performance Assessment of EPDM O-Rings under Irradiation Conditions

A Leakage Prediction Model for Sealing Performance Assessment of EPDM O-Rings under Irradiation Conditions

A Fractal Contact Model for Rough Surfaces considering the Variation of Critical Asperity Levels

A Porous Media Leakage Model of Contact Mechanical Seals Considering Surface Wettability

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