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Thermohydrodynamics of bidirectional groove dry gas seals with slip flow

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journal contribution
posted on 15.08.2016, 12:41 by H. Su, Ramin RahmaniRamin Rahmani, Homer Rahnejat
Thermo-hydrodynamic behaviour of bidirectional dry gas seals with trapezoidal shaped symmetric grooves is studied. A multi-physics model, coupling compressible laminar flow and heat transfer in both the fluid and the solid bodies is used in a multi-physics modelling environment. The multi-physics model also includes slip flow conditions, corresponding to relatively high Knudsen numbers, as well as the effect of asperity interactions on the opposing seal faces. A comparison of the seal performance under isothermal and thermal flow conditions shows the importance of including the thermal effects. The difference in the predicted opening force between isothermal and thermal model can exceed 2.5%, which is equivalent to a force of around 1 kN. The importance of designing gas seals to operate at the minimum possible gap to reduce power losses as well as leakage from the contact is highlighted. However, it is shown that there exists a critical minimum gap, below which the power loss in the contact can abruptly increase due to asperity interactions, generating significantly increased operating temperatures.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

International Journal of Thermal Sciences

Volume

110

Pages

270 - 284

Citation

SU, H., RAHMANI, R. and RAHNEJAT, H., 2016. Thermohydrodynamics of bidirectional groove dry gas seals with slip flow. International Journal of Thermal Sciences, 110, pp. 270-284.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

25/07/2016

Publication date

2016-07-29

Notes

This paper was accepted for publication in the journal International Journal of Thermal Sciences and the definitive published version is available at http://dx.doi.org/10.1016/j.ijthermalsci.2016.07.011.

ISSN

1290-0729

Language

en