Observations of thermoelastic instability in mechanical face seals

Netzel, James P.

doi:10.1016/0043-1648(80)90275-6

Cited by 32 publications

(4 citation statements)

References 4 publications

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“…The thermomechanical properties and dimensions used in generating Fig. 2 corresponds to a mechanical face seal tested by Netzel [13]. He observed six hot spots when operating the seal at 7200 r/min (37.7 m/s) using water.…”

Section: Resultsmentioning

confidence: 99%

On the thermoelastic instability of a thin-film-lubricated sliding contact: A closed-form solution

Peng

Khonsari

Pascovici

2003

Proceedings of the Institution of Mechanical Engineers, Part J:

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Thermoelastic instability (TEI) in a mechanical component manifests itself in the form of macroscopic hot spots. To gain insight into the mechanism of hot spotting, an engineering TEI model for two solid surfaces separated by a viscous liquid ®lm in relative sliding motion is developed. The model lends itself to a useful analytical expression for determining the threshold of instability with provision for the effect of the migration speed. NOTATION a wave number associated with perturbation in the y direction (m ¡1 ) A amplitude of the perturbed surface temperature (K) A s wetted surface area of the conductor (m 2 ) c migration speed in the local coordinate x direction (m/s) d penetration depth (m) E Young's modulus (N/m 2 ) h total ®lm thickness (m) h 0 perturbation (m) h 0 nominal ®lm thickness (m) k conductivity (W/m K) L radial width of the mechanical seal (m) m width factor of the seal lip p hydrodynamic pressure (Pa) q total heat¯ux (W/m 2 ) q 0 perturbed heat¯ux (W/m 2 ) q 0 nominal heat¯ux (W/m 2 ) Q heat generated (W) t time (s) T 0 perturbed temperature ®eld (K) T 0 s perturbed surface temperature (K) u¯ow velocity in the x direction (m/s) U operating speed (m/s) U cr critical operating speed (m/s) V volume of¯uid (m 3 ) w¯ow velocity in the z direction (m/s) x local coordinate in the moving direction y local coordinate inward normal to the conductor surface z local coordinate into the paper a coef®cient of expansion (K ¡1 ) b stability parameter (s ¡1 ) _ g g viscous strain rate (s ¡1 ) d 0 total surface deformation (m) d 0 e elastic surface deformation (m) d 0 th perturbed thermal expansion (m) k thermal diffusivity (m 2 /s) m¯uid viscosity (Pa s) O wave number associated with perturbation in the x direction (m ¡1 ) t shear stress (N/m 2 ) x spatial growth parameter of the perturbed temperature (m ¡1 )

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Section: Resultsmentioning

confidence: 99%

On the thermoelastic instability of a thin-film-lubricated sliding contact: A closed-form solution

Peng

Khonsari

Pascovici

2003

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Sehitoglu (1983) provided an explanation for the development of surface cracking, in which he noted that constraint on free thermal expansion of the hot spot by relatively cooler surrounding material is responsible for the formation of thermal fatigue cracks. Evidence of thermal cracks has been observed in railway brakes (Dow (1980), Fec andSehitoglu (1985)), mechanical seals (Netzel (1980), Kennedy and Karpe (1982)) and automotive brakes (Anderson and Knapp (1989). High temperatures are another consequence of the high local heat flux, which also has been reported in the railway brake (Van Swaay (1969), Ho et al (1974), Wentenkamp andKipp (1976), Van Swaay (1979), Hewitt and Musial (1979)).…”

Section: Frictionally Excited Thermoelastic Instability (Tei)mentioning

confidence: 88%

The Thermo-Mechanical Behavior in Automotive Brake and Clutch Systems

Al-Shabibi¹

2011

New Trends and Developments in Automotive System Engineering

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“…These were simulated by assuming a lm thickness h 0 = 2:5¼ and including a prescribed surface roughness. To examine the utility of these simulations, let us examine the experimental results of Netzel (1980), who tested a mechanical face seal lubricated with water. Netzel noted the appearance of ve to six hot spots when operating the seal at 7200 RPM (37.7 m s ¡1 ).…”

Section: (D) Number Of Disturbancesmentioning

confidence: 99%

A generalized thermoelastic instability analysis

Jang

Khonsari

2003

Proc. R. Soc. Lond. A

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The onset of thermoelastic instability (TEI) is known to be directly related to the occurrence of hot spots in a variety of mechanical components such as brakes, seals and clutches. To gain some insight into this failure mechanism, an analytical model for both the symmetric and antisymmetric modes was developed to analyse a friction pair consisting of a conducting body of nite thickness rubbing against an insulating body in the presence of a lubricating agent. The e¬ect of surface roughness, hydrodynamic pressure and viscous shear dissipation within the lubricating lm is included in the formulation. The model provided in this paper is general and thus useful for investigating the TEI of a component at the design stage. Several new dimensionless parameters are introduced that allow one to characterize the behaviour of either dry or lubricated systems and their susceptibility to TEI.

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Observations of thermoelastic instability in mechanical face seals

Cited by 32 publications

References 4 publications

On the thermoelastic instability of a thin-film-lubricated sliding contact: A closed-form solution

On the thermoelastic instability of a thin-film-lubricated sliding contact: A closed-form solution

The Thermo-Mechanical Behavior in Automotive Brake and Clutch Systems

A generalized thermoelastic instability analysis

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