Numerical Analysis of the Flow Field Within Lip Seals Containing Microundulations

1992 ◽  
Vol 114 (3) ◽  
pp. 485-491 ◽  
Author(s):  
R. F. Salant
Keyword(s):  
Numerical Analysis ◽  
Flow Field ◽  
Shear Deformation ◽  
Leakage Rate ◽  
Shaft Speed ◽  
Rotating Shaft ◽  
Lip Seal ◽  
Lubricating Film ◽  
Lip Seals

The flow field within the lubricating film of a rotating shaft lip seal containing microundulations is analyzed numerically. The results demonstrate that the action of the microundulations can prevent leakage through the seal. The effects on leakage rate of shaft speed, undulation amplitude and wavelength, shear deformation of the undulations, flattening of the undulations, and axial lip profile are presented.

Grinding Fluid Flow Field Modeling and Multi-Parameter Numerical Analysis Based on Smooth Model

2010 ◽  
Vol 156-157 ◽  
pp. 948-955
Author(s):  
Guang Yao Meng ◽  
Ji Wen Tan ◽  
Yi Cui
Keyword(s):  
Fluid Flow ◽  
Numerical Analysis ◽  
Flow Field ◽  
Dynamic Pressure ◽  
Grinding Wheel ◽  
Lubricating Film ◽  
Fluid Field ◽  
Grinding Fluid ◽  
Smooth Model ◽  
Area Increase

Relative motion between grinding wheel and workpiece makes the lubricant film pressure formed by grinding fluid in the grinding area increase, consequently, dynamic pressure lubrication forms. The grinding fluid flow field mathematical model in smooth grinding area is established based on lubrication theory. The dynamic pressure of grinding fluid field, flow velocity and carrying capacity of lubricating film are calculated by the numerical analysis method. An analysis of effect of grinding fluid hydrodynamic on the total lifting force is performed, and the results are obtained.

Hydrodynamic Analysis of the Flow in a Rotary Lip Seal Using Flow Factors

2004 ◽  
Vol 126 (1) ◽  
pp. 156-161 ◽  
Author(s):  
Richard F. Salant ◽  
Ann H. Rocke
Keyword(s):  
Flow Field ◽  
Pressure Distribution ◽  
Reynolds Equation ◽  
Present Approach ◽  
Operating Parameters ◽  
Pumping Rate ◽  
Hydrodynamic Analysis ◽  
Lip Seal ◽  
Lubricating Film ◽  
Computationally Intensive

The flow field in the lubricating film of a rotary lip seal is analyzed numerically by solving the Reynolds equation with flow factors. The behavior of such a flow field is dominated by the asperities on the lip surface. Since previous analyses treated those asperities deterministically, they required very large computation times. The present approach is much less computationally intensive because the asperities are treated statistically. Since cavitation and asperity orientation play important roles, these are taken into account in the computation of the flow factors. Results of the analysis show how the operating parameters of the seal and the characteristics of the asperities affect such seal characteristics as the pressure distribution in the film, the pumping rate and the load support.

Elastohydrodynamic Analysis of Reverse Pumping in Rotary Lip Seals With Microasperities

1995 ◽  
Vol 117 (1) ◽  
pp. 53-59 ◽  
Author(s):  
Richard F. Salant ◽  
Andrew L. Flaherty
Keyword(s):  
Fluid Mechanics ◽  
High Pressures ◽  
Elastic Behavior ◽  
Lip Seal ◽  
Lubricating Film ◽  
Lip Seals ◽  
Reverse Pumping

An elastohydrodynamic analysis of a rotary lip seal containing microasperities, incorporating both the fluid mechanics of the lubricating film and the elastic behavior of the lip, has been performed numerically. The results indicate that some asperity patterns generate reverse pumping that prevents leakage through the seal. Other asperity patterns are found to generate negative reverse pumping that enhances leakage. In all cases considered, the asperities also hydrodynamically generate sufficiently high pressures to provide load support and maintain the integrity of the film.

Elastohydrodynamic Analysis of Reverse Pumping in Rotary Lip Seals With Microundulations

1994 ◽  
Vol 116 (1) ◽  
pp. 56-62 ◽  
Author(s):  
R. F. Salant ◽  
A. L. Flaherty
Keyword(s):  
Fluid Mechanics ◽  
High Pressures ◽  
Elastic Behavior ◽  
Pumping Rate ◽  
Dynamic Conditions ◽  
Lip Seal ◽  
Lubricating Film ◽  
Lip Seals ◽  
Reverse Pumping

An elastohydrodynamic analysis of a rotary lip seal containing microundulations, incorporating both the fluid mechanics of the lubricating film and the elastic behavior of the lip, has been performed numerically. The results indicate that, under dynamic conditions, the undulation pattern deforms such that it produces reverse pumping. The reverse pumping rate is substantial, and overwhelms the natural leakage induced by the sealed pressure, thereby preventing leakage through the seal. The results also show that the undulations hydrodynamically generate sufficiently high pressures, within the film, to provide load support and maintain the integrity of the film.

scholarly journals Numerical Investigation of Grooved Shaft Effects on the Rotary Lip Seal Performance with Relative Lip Motion

Lubricants ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 16
Author(s):  
Imane Lahjouji ◽  
M’hammed El Gadari ◽  
Mohammed Radouani
Keyword(s):  
Relative Motion ◽  
Relative Velocity ◽  
Hydrodynamic Lubrication ◽  
Current Model ◽  
Friction Torque ◽  
Rotating Shaft ◽  
Transient Conditions ◽  
Lip Seal ◽  
Lip Seals ◽  
Reverse Pumping

It is generally agreed that radial lip seals are used in systems with a rotating shaft and a stationary lip. However, according to previous work, it was demonstrated that relative motion between the shaft and the lip has substantial effects on the hydrodynamic lifting load and sealing performances. Nowadays, new generations of textured shafts have emerged in order to reduce friction torque and improve reverse pumping, but no study has confirmed the effect of the relative motion between the rough lip and the shaft grooves on the rotary lip seal performances. In this work, an isothermal hydrodynamic lubrication was performed in transient conditions to investigate the effect of the relative velocity between an oblique grooved shaft and a rough lip. After confirming the validity of the current model with respect to previous works, simulations have underlined the effect of the grooved shaft with relative lip motion on the rotary lip seal performance. Indeed, by keeping the same relative velocity between surfaces, it is shown that moving the shaft with a rate higher than that of the lip surface could produce an important reverse pumping and reduce the friction torque significantly, in comparison with cases where the shaft velocity is weaker.

Nonlinear Finite Element Analysis of Radial Lip Seals

2017 ◽  
Author(s):  
Rutuja Suhas Joshi ◽  
David C. Roberts ◽  
Hany Ghoneim
Keyword(s):  
Finite Element ◽  
Numerical Results ◽  
Material Behavior ◽  
Contact Load ◽  
Nonlinear Material ◽  
Rotating Shaft ◽  
Element Analysis ◽  
Lip Seal ◽  
Contact Width ◽  
Lip Seals

Oil seals or radial lip seals are widely used in reciprocating, oscillating and rotating shaft applications. The sealability and durability of a lip seal greatly depends on the contact load and contact pressure distribution. It is challenging to find these contact parameters of the seal due to non-linear material behavior and small contact width, therefore numerical simulation can prove to be a viable method. In this paper, to address these challenges and to develop a robust numerical methodology, a Finite Element Model of a lip seal is created in ANSYS APDL. This model includes contact elements to model the lip seal’s contact-fit with certain interference, nonlinear material properties of elastomer and effect of the finger spring molded in the rubber body of the seal. The parameters for two term Mooney Rivlin Model for elastomer are obtained from simple uniaxial tension test. The numerical results demonstrate that the contact load exerted by the composite seal (with spring) is higher than the contact load exerted by elastomer portion of seal alone. It can be implied that the spring augments the radial load and increases the stiffness of the lip, which improves the lip’s sealability and durability. Experimental study is carried to validate the numerical results. The experimental results correspond well with the numerical results.

Analysis of three-dimensional non-axisymmetric elastic effects of the lip on the thermoelastohydrodynamic radial lip seal behaviour

2007 ◽  
Vol 221 (8) ◽  
pp. 859-868 ◽  
Author(s):  
A Maoui ◽  
M Hajjam ◽  
D Bonneau
Keyword(s):  
Surface Roughness ◽  
Numerical Analysis ◽  
Numerical Models ◽  
Three Dimensional ◽  
Operating Characteristics ◽  
Lip Seal ◽  
Lip Seals ◽  
Deformation Distribution

Numerical models, proposed to analyse the elastohydrodynamic and thermoelastohydrodynamic (TEHD) behaviour of radial lip seals, have been considered in terms of an axisymmetrical approach to elastic seal deformation. However, the results obtained using a non-axisymmetrical elastic approach to investigating the tip of the lip differed from the axisymmetrical approach results in relation to the deformation distribution of the lip surface. The main objective of the present work is to show through numerical analysis the three-dimensional nonaxisymmetric effect of the lip deformations on the TEHD behaviour of radial lip seals. Hence, a comparison between both elastic approaches is presented in order to analyse the influence of the lip's non-axisymmetric behaviour on all of the operating characteristics of the lip seal. In addition, different forms of the lip surface roughness are investigated.

TWO-DIMENSIONAL BINGHAM PLASTIC FLOW IN A CYLINDRICAL PRESSURISED CLUTCH

1994 ◽  
Vol 08 (20n21) ◽  
pp. 2955-2965 ◽  
Author(s):  
R. J. ATKIN ◽  
T. J. CORDEN ◽  
T. G. KUM ◽  
W. A. BULLOUGH
Keyword(s):  
Flow Model ◽  
Maximum Yield ◽  
Leakage Rate ◽  
Two Dimensional ◽  
Shaft Speed ◽  
Shaft Seal ◽  
Rotating Shaft ◽  
Bingham Plastic ◽  
Theory And Experiment ◽  
Laminar Flow Model

An examination of the capability of an energised electro-rheological fluid to act as a rotating shaft seal is reported. A two-dimensional laminar flow model based on a Bingham plastic flowing between parallel plate electrodes indicated that leakage would always occur whenever the shaft was in rotation, whatever the magnitude of the pressure gradient along the sealing annulus. This result was confirmed in experiments, the results of which show some discrepancy between theory and experiment in the magnitude of the leakage rate. However this error is accountable and is acceptable in the area of immediate interest-shaft speed of circa 1000/1500 rpm and at maximum yield or electro-stress.

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