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Surface Roughness 3D Modelling and its Association With Leak Tightness for a Metal-to-Metal Contacting Surface

[+] Author Affiliations
Ali A. Anwar, William Dempster, Yevgen Gorash, David Nash

University of Strathclyde, Glasgow, UK

Paper No. PVP2017-65404, pp. V004T04A004; 7 pages
doi:10.1115/PVP2017-65404
From:
  • ASME 2017 Pressure Vessels and Piping Conference
  • Volume 4: Fluid-Structure Interaction
  • Waikoloa, Hawaii, USA, July 16–20, 2017
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5797-7
  • Copyright © 2017 by ASME

abstract

This paper presents an overview of a numerical method developed to allow one-way structure-fluid interaction of a scanned representative surface of a Pressure Relief Valve (PRV) measuring 100 μm by 100 μm to be incorporated into a coupled finite element and computational fluid dynamics model to investigate gas leak rates through micro-gaps in full size metal-to-metal contacting components. The virtual representative surface is created via a real scan using a 3D micro coordinate and surface roughness measurement system. The scan of the physical surface is converted to a CAD format and a finite element model generated which is deformed for a given loading condition. The micro-gaps of the deformed FEA model are extracted and imported into the CFD solver to find the resulting volumetric/mass flow rate for the same set of pressure conditions. This coupled approach allows the leakage rate to be found based on only the surface roughness of metal-to-metal sealing surfaces. This methodology can now be expanded to understand the behaviour and response of metal-to-metal deformable contacting surface components under pressure. Thereafter, the design objective is to minimise or eliminate component leakage.

Copyright © 2017 by ASME

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