Comparative research on gas seal performance textured with microgrooves and microdimples

  • Liping ShiEmail author
  • Yicong Zhang
  • Si Chen
  • Wei Zhu
Technical Paper


The purpose of this paper is to compare the effects of different surface texture patterns on the performance of mechanical gas seals. Firstly, two types of surface texture, i.e., the patterns of microgrooves and microdimples, are constructed, and the steady-state Reynolds equation for compressible Newtonian fluid is employed and solved considering the collective effect of adjacent textures. Then, comparative analysis of different seal parameters such as the load-carrying force, gas film stiffness and gas leakage between microgrooves and microdimples is presented. Finally, two property-evaluating parameters are defined and different texture shapes and main parameters are compared. The results indicate that texture shapes with a straight edge perform better performance than those with a round edge. Furthermore, microgrooves 2 interpenetrating high-pressure side with texture depth of 3 µm may be the best choice in engineering practice, especially under small seal clearance and high rotation speed conditions.


Surface texture patterns Mechanical gas seals Gas lubrication Hydrodynamic effect 

List of symbols


Texture depth


Seal clearance


Sealing gas dynamic viscosity


Area density, SP = A/S


Area of textures


Area of the rotor ring face


Gas density


Inner radius of the rotor ring


Outer radius of the rotor ring


Length of the microgrooves


Width of the microgrooves


Long semi-axes of elliptical microdimples


Short semi-axes of elliptical microdimples


Radius of circular dimples


Number of microgrooves


Number of microdimples


Rotation speed of the rotor ring (rpm)


An atmospheric pressure


Cylindrical coordinate in radial direction


Cylindrical coordinate in circumferential direction

p(r, θ)

Gas hydrodynamic pressure at point (r, θ)

h(r, θ)

Gas film thickness at point (r, θ)


Textured region


Central angle of studied area


Ideal gas constant, 8.31 cm3 MPa/mol K


Absolute temperature of this sealing system, 300 K


Average molar mass of gas, 29 g/mol


Inlet pressure


Outlet pressure


Load-carrying force


Gas film stiffness


Gas leakage


Dimensionless load-carrying force


Dimensionless gas film stiffness


Dimensionless gas leakage


Property-evaluating parameter


Property-evaluating parameter

\( E_{{W_{ {\rm max} } }} \)

Maximum property-evaluating parameter

\( E_{{K_{ {\rm max} } }} \)

Maximum property-evaluating parameter



The authors are grateful for the financial support provided by the Natural Science Foundation of Anhui Province of China (1708085QE113) and Foundation for Outstanding Young Talents of Higher Education of Anhui Province (gxyq2019018).


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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.School of Mechanical EngineeringAnhui University of TechnologyMa’anshanChina

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