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TECHNICAL PAPERS

Experimental Leak-Rate Measurement Through a Static Metal Seal

[+] Author and Article Information
Christophe Marie

Département Génie Chimique, IUT de l’Aisne, 48, rue d’Ostende, 02100 Saint-Quentin, France

Didier Lasseux1

Esplanade des Arts et Métiers, Trefle (UMR CNRS 8508), Site ENSAM, 33405 Talence Cedex, Francedidier.lasseux@bordeaux.ensam.fr

1

Author to whom correspondence should be addressed.

J. Fluids Eng 129(6), 799-805 (Nov 23, 2006) (7 pages) doi:10.1115/1.2734250 History: Received September 07, 2004; Revised November 23, 2006

This paper presents an experimental study to characterize fluid leakage through a rough metal contact. The focus is on an original experimental setup and procedure designed to measure the fluid micro (or nano) leak rate with great precision over several orders of magnitude. Liquid leak-rate measurements were carried out under two distinct operating conditions, i.e., in the case of a pressure gradient applied between contact edges and in the case of a pure diffusive effect resulting from a species concentration gradient. Experimental leak-rate results are discussed in terms of effective contact permeability—or transmissivity—and in terms of effective contact diffusivity versus contact tightening.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Configuration of the contact under study

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Figure 2

Schematic representation of the experimental apparatus (viscous flow conditions)

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Figure 3

Indentation of a polished copper surface by the rough metallic ring, Pca=50MPa

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Figure 4

Mass of leaking fluid through the contact versus time - Pca=240MPa - ΔP=9bar. Open and dark symbols correspond to an initial dry and wet contact respectively

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Figure 5

Time evolution of the mass of butanol in the solvent loop - Surface B1

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Figure 6

Time evolution of the mass of butanol in the solvent loop - Surface A

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Figure 11

Power law fits on K(Pca) - Surfaces B1 and B2

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Figure 12

Ratio of effective diffusivity to molecular diffusion coefficient determined from experimental leak rate measurements - Surfaces B1 and B2

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Figure 7

Mass leak-rate versus pressure drop through the contact for four values of tightening - Surafce B1

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Figure 8

Time evolution of the mass of butanol in the solvent loop - Surface B2 - Pca=700MPa - a) ΔP=10bars - b) ΔP=20bars - c) ΔP=30bars

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Figure 9

Mass leak-rate versus pressure drop - Pca=700MPa - Surface B2

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Figure 10

Contact transmissivity versus tightening for two similar rough surfaces B1 and B2

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