An Approach to Calculate Leak Channels and Leak Rates Between Metallic Sealing Surfaces

Zhang, Feikai; Liu, Jianhua; Ding, Xiaoyu; Yang, Zhimeng

doi:10.1115/1.4033887

Cited by 23 publications

(7 citation statements)

References 29 publications

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“…Statistical analysis using a general linear test approach (Neter et al, 1996) demonstrated that the diffusion term in the leakage model was negligible compared to the pressure term. This is in line with the approaches used by Bottiglione et al (2009; and Zhang et al (2017). As directly shown by Fick's law of diffusion, the rate at which a gas diffuses is proportional to the area of the surface over which the diffusion process takes place and the concentration gradient.…”

Section: Leakage Is a Pressure Driven Processsupporting

confidence: 89%

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Model based leak correction of real-time RQ measurement for dynamic controlled atmosphere storage

Bessemans

Verboven

Verlinden³

et al. 2018

Postharvest Biology and Technology

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A method was developed to correct real-time measurements of the respiratory quotient (RQ) of pome fruit for gas leakage of a cool room. The method is based on a general leakage model that was simplified by performing sensitivity analysis of the contribution of the pressure driven and concentration driven gas transport terms. The analysis showed that pressure driven leakage was dominant over diffusive leakage. The methodology was validated successfully using an empty storage container at 0.4 kPa O2 and 1.3 kPa CO2. A sensitivity analysis using virtual storage experiments showed that the error of the RQ estimates with leak correction was 0 %, while without leak correction they increased to above 700 %. Finally, the validated model was successfully implemented in an automated RQ-DCA control system using 'Braeburn' apple fruit (Malus ×domestica 'Braeburn' 2x). RQ estimates without leakage correction were heavily biased when leakage of atmospheric air into the storage container occurred and would lead to erroneous control of the storage atmosphere composition. With the developed leakage correction, RQ measurements were found to be accurate during decreasing as well as increasing atmospheric air pressure.

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Section: Leakage Is a Pressure Driven Processsupporting

confidence: 89%

“…This might result in small percolation channels allowing gas flow between the cool room and environment (Bottiglione et al, 2009(Bottiglione et al, ,2016Zhang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Model based leak correction of real-time RQ measurement for dynamic controlled atmosphere storage

Bessemans

Verboven

Verlinden³

et al. 2018

Postharvest Biology and Technology

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“…The comments we make are, however, general to all domains of both topographies studied. Moreover, the shape of the curve presented in Figure 5 has been observed in many theoretical observations [16,[28][29][30][31] as well as experimental studies [1,32], considering both elastic and elasto-plastic materials.…”

Section: Qualitative Descriptionsupporting

confidence: 64%

An Enhanced Stochastic Two-Scale Model for Metal-to-Metal Seals

Pérez-Ràfols

Almqvist

2018

Lubricants

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Leakage in static metal-to-metal seals is predominantly determined by the topography of the contacting surfaces. The topography consists of features that span the entire range from its carefully engineered geometry down to micro-sized surface asperities. The mesh density necessary to fully resolve all the features, in this large span of length scales, generates too many degrees of freedom for a direct numerical approach to be applicable. Some kind of sophistication, either incorporated in the mathematical model or in the numerical solution procedure or even a combination of both is therefore required. For instance, in a two-scale model, the geometrical features can be addressed in the global-scale model, while the features belonging to length scales smaller than a given cut-off value are addressed in the local-scale model. However, the classical two-scale approaches do not explicitly address the stochastic nature of the surfaces, and this has turned out to be a requirement in order to obtain quantitative predictions of leakage in metal-to-metal seals. In this work, we present a continued development of an already existing two-scale model, which incorporates a stochastic element. The novelty lies in the way we characterise the permeability at the local scale and how this is used to build a more efficient and useful approach.

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“…On the contact area, it needs the contact analysis to judge the contact width required, to ensure the sealing performance of the contact area. Based on the commonly used leakage model A Roth, this project has improved, the cone contour surface is simplified as a plane and the globe surface is simplified as a cylinder [4][5], whose radius is the radius of the globe. The improved model is shown in figure 7.…”

Section: Contact Area Criterionmentioning

confidence: 99%

Research On Globe-cone Joint Assembly Of Spacecraft Propulsion System

et al. 2017

Self Cite

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As one of the key step of spacecraft propulsion system assembly, globe-cone joint assembly determines the spacecraft's high reliability and long life on orbit. Through test, simulation analysis and calculation on sealing mechanism of globe-cone joint, in this paper, we make sure the relationship of the tightening torque and globe-cone joint contact stress and contact area, and obtain assembly torque range of different specifications of globe-cone joint, which gives necessary reference for mechanical environment verification. a CorrespondingBesides the simulation analysis and calculation of the torque range, it needs further research to verify the torque range under mechanical environment, and to narrow the range.

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An Approach to Calculate Leak Channels and Leak Rates Between Metallic Sealing Surfaces

Cited by 23 publications

References 29 publications

Model based leak correction of real-time RQ measurement for dynamic controlled atmosphere storage

Model based leak correction of real-time RQ measurement for dynamic controlled atmosphere storage

An Enhanced Stochastic Two-Scale Model for Metal-to-Metal Seals

Research On Globe-cone Joint Assembly Of Spacecraft Propulsion System

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