Phase Change in a Misaligned Mechanical Face Seal

1996 ◽  
Vol 118 (1) ◽  
pp. 109-115 ◽  
Author(s):  
I. Etsion ◽  
M. D. Pascovici
Keyword(s):  
Analytical Solution ◽  
Phase Change ◽  
Face Seal ◽  
Mechanical Seals ◽  
Mechanical Face Seal ◽  
Implicit Analytical Solution

The combination of phase change, coning, and face misalignment in mechanical seals is studied. The seal performance is calculated using an implicit analytical solution of the thermohydrodynamic problem. It is found that phase change can be detrimental to the seal’s angular stiffness. It is also found that the boiling interface is practically axisymmetric, even at moderate face misalignment. Thus, future analyses of phase change with misalignment can be considerably simplified.

Calculation Method of Mechanical Face Seal Temperature Based on Heat Conduction Angle

2012 ◽  
Vol 468-471 ◽  
pp. 500-504
Author(s):  
Jie Gao ◽  
Peng Yun Song ◽  
Xiao Yun Hu ◽  
Fang Bo Ma
Keyword(s):  
Heat Conduction ◽  
Temperature Distribution ◽  
Friction Condition ◽  
Mechanical Seal ◽  
Face Seal ◽  
Mechanical Seals ◽  
Key Technology ◽  
Mechanical Face Seal ◽  
And Control ◽  
Face Temperature

It is a key technology in the design and application of mechanical seals as how to determine and control its face temperature. According to the explicitly defined heat conduction angle, supposed the surfaces of the stator ring are insulation, and the heat produced by friction of seal faces transfers only through the rotor ring along the heat conduction angle, an approximate analytical method calculating the end face temperature distribution of mechanical seal was developed for mixed friction condition in this paper. The heat conduction angle, angular velocity, contact pressure and other factors and its law on end face temperature distribution have also been analyzed in this paper. The results of this method for calculating the end face temperature are much closer to the reality, compared with other approximate analytical methods.

A Mixed Friction Hydrostatic Face Seal Model With Phase Change

1980 ◽  
Vol 102 (2) ◽  
pp. 133-138 ◽  
Author(s):  
A. O. Lebeck
Keyword(s):  
Phase Change ◽  
Design Parameters ◽  
Face Seal ◽  
Mechanical Contact ◽  
Two Phase ◽  
Mixed Friction ◽  
Mechanical Face Seal ◽  
Higher Temperature ◽  
And Performance ◽  
Very High

A mixed friction hydrostatic mechanical face seal model is presented. Load support and friction due to mechanical contact and the effect of a phase change are considered. The results show that a phase change within the seal interface leads to a greater fraction of the load being supported by fluid film pressure than for an all liquid or all gas phase seal. As seal operating temperature approaches the boiling point of the sealed fluid, very high leakage is predicted. An explanation for puffing is offered. The effect of various design parameters on two phase seal operation is examined. On a theoretical basis, operation at a higher temperature reduces seal wear rate and friction. The model can be used by seal designers to predict instability and performance for a two phase seal.

Thermoelastohydrodynamic Behavior of Mechanical Gas Face Seals Operating at High Pressure

2007 ◽  
Vol 129 (4) ◽  
pp. 841-850 ◽  
Author(s):  
Sébastien Thomas ◽  
Noël Brunetière ◽  
Bernard Tournerie
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Numerical Modeling ◽  
Face Seal ◽  
Inertia Effects ◽  
Real Gas ◽  
Choked Flow ◽  
Face Seals ◽  
Mechanical Face Seal ◽  
Gas Expansion

A numerical modeling of thermoelastohydrodynamic mechanical face seal behavior is presented. The model is an axisymmetric one and it is confined to high pressure compressible flow. It takes into account the behavior of a real gas and includes thermal and inertia effects, as well as a choked flow condition. In addition, heat transfer between the fluid film and the seal faces is computed, as are the elastic and thermal distortions of the rings. In the first part of this paper, the influence of the coning angle on mechanical face seal characteristics is studied. In the second part, the influence of the solid distortions is analyzed. It is shown that face distortions strongly modify both the gap geometry and the mechanical face seal’s performance. The mechanical distortions lead to a converging gap, while the gas expansion, by cooling the fluid, creates a diverging gap.

scholarly journals Lubrication and Wear Characteristics of Mechanical Face Seals under Random Vibration Loading

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1285
Author(s):  
Wentao He ◽  
Shaoping Wang ◽  
Chao Zhang ◽  
Xi Wang ◽  
Di Liu
Keyword(s):  
Dynamic Model ◽  
Random Vibration ◽  
Experimental Studies ◽  
Lumped Parameter Model ◽  
Axial Stiffness ◽  
Face Seal ◽  
Wear Characteristics ◽  
Vibration Loading ◽  
Face Seals ◽  
Mechanical Face Seal

The service life of mechanical face seals is related to the lubrication and wear characteristics. The stable analytical methods are commonly used, but they cannot address effects of random vibration loading, which, according to experimental studies, are important factors for lubrication and wear of mechanical face seals used in air and space vehicles. Hence, a dynamic model for mechanical face seals is proposed, with a focus on the effects of random vibration loading. The mechanical face seal in the axial direction is described as a mass-spring-damping system. Spectrum analysis specified for random vibration is then performed numerically to obtain the response power spectral density (PSD) of the mechanical face seal and calculate the root mean square (RMS) values under random vibration conditions. A lumped parameter model is then developed to examine how dynamic parameters such as stiffness and damping affect the lubrication regimes of mechanical face seals. Based on the dynamic model and Archard wear equation, a numerical wear simulation method is proposed. The results elucidated that the increase of input acceleration PSDs, the decrease of axial damping, and the increase of axial stiffness lead to the probability of the mechanical face seal operating under full film lubrication regime increase and finally the decrease of wear. This research provides a guideline for improving the adaptability of mechanical face seals under random vibration environments.

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