Numerical Analysis the Tibological Performance of a Laser Surface Textured Mechanical Seal

2011 ◽  
Vol 464 ◽  
pp. 518-523
Author(s):  
Yong Hong Fu ◽  
Jing Hu Ji ◽  
Xi Jun Hua ◽  
Qin Sheng Bi
Keyword(s):  
Numerical Study ◽  
Tribological Performance ◽  
Friction Torque ◽  
Diameter Ratio ◽  
Laser Surface ◽  
Hydrodynamic Effect ◽  
Geometrical Parameters ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
Area Density

This paper presents a numerical study of the effects of surface structure geometrical parameters on the tribological performance of a laser surface textured mechanical seal. Seal performance such as seal clearance which is corresponding to hydrodynamic effect and friction torque is calculated for a range of sealed pressures, dimples area density and dimple depth over dimple diameter ratio. The results indicated that laser surface textured mechanical seals substantially improve the tribological performance in the lower sealed pressure than in high pressure. Area density of dimples has little effect on the tribological performance, however, dimple depth over dimple diameter ratio has significant effect on the tribological performance.

Numerical Simulation of Lubricant Liquid Film of the Laser Surface Textured Micro-Pore Face Mechanical Seal

2013 ◽  
Vol 579-580 ◽  
pp. 548-553
Author(s):  
Peng Gao Zhang ◽  
Bo Qin Gu ◽  
Long Wei ◽  
Qi He Liu
Keyword(s):  
Liquid Film ◽  
Influence Factors ◽  
Laser Surface ◽  
Hydrodynamic Effect ◽  
Mechanical Seal ◽  
Area Density ◽  
Rotating Speed ◽  
Sealing Performance ◽  
Flow Field Characteristics ◽  
Fluent Software

The flow field characteristics of lubricant liquid film of the laser surface textured micro-pore face mechanical seal were studied by Fluent software, and the effects of geometric parameters of micro pores and operating parameters on the sealing performance were analyzed. The results show that the hydrodynamic effect of the laser surface textured micro-pore face mechanical seal is very obvious, and micro-pores make the friction state between rotating ring and stationary ring change to fluid friction. It can also be found that the rotating speed, the medium pressure, the area density and the liquid film thickness have effect on the sealing performance, among these influence factors, the area density has the greatest effect on the sealing performance, and it should be 0.2-0.3.

Analysis of Carrying Capacity and Friction Torque of Friction Pair Fluid-Film for High Parameter Bellows Mechanical Seal

2013 ◽  
Vol 455 ◽  
pp. 207-211
Author(s):  
Mutellip Ahmat ◽  
Zhi Wei Niu ◽  
Guzaiayi Abudoumijiti
Keyword(s):  
Carrying Capacity ◽  
High Speed ◽  
Influence Factor ◽  
Friction Pair ◽  
Scientific Basis ◽  
Friction Torque ◽  
Fluid Film ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
The Relationship

The friction pair for bellows mechanical seal as a friction element is one of the key components for it. In this research, by based on the computational fluid dynamics (CFD) numerical theory, using the Fluent software, corresponding model and parameters, the fluid-film between the clearance of the sealing ring friction pair for the bellows mechanical seal under such the high-temperature, high-pressure, high-speed as complex working conditions is numerically simulated, the relationship between the carrying-capacity of the fluid-film and the temperature, the viscosity of the fluid-film, the relationship between friction torque of the fluid-film and the speed, viscosity of the fluid-film, the influence factor of leakage are obtained. The researching results provide the scientific basis for the optimization designing of the high parameter bellows mechanical seals.

Liquid Film Performance Analysis of the Mechanical Seals with a Laser-Textured Micro-Pore Face

2010 ◽  
Vol 139-141 ◽  
pp. 418-421
Author(s):  
Xin Qi Yu ◽  
Qing Gang Liu ◽  
Hui Qin Gao ◽  
Jia Hui Yu
Keyword(s):  
Liquid Film ◽  
Parametric Analysis ◽  
Fluid Pressure ◽  
Diameter Ratio ◽  
Hydrodynamic Effect ◽  
Mechanical Seals ◽  
Film Pressure ◽  
Pressure Profiles ◽  
Pore Area ◽  
The Finite Difference Method

A theoretical model has been developed for the mechanical seals with a laser-textured porous seal face. By means of variable dimensionless steps, parametric analysis has been performed to obtain dimensionless liquid film pressure by the finite difference method. Liquid film pressure profiles over the pore column have be achieved by the computer program MATLAB. It is found from calculating results that average liquid film pressure increases with increase of the rotational speed, liquid viscosity and reduction of liquid film thickness. Hydrodynamic effect produced by micro-pores decreases with increase of fluid pressure. In addition, the effect of the pore area density and depth over diameter ratio on the liquid film pressure is very significant. Optimum values of these parameters can maximize the average liquid film pressure.

Comprehensive analysis of geometrical parameters of crosshatched texture for enhanced tribological performance under biological environment

2020 ◽  
pp. 135065012091513
Author(s):  
V Kashyap ◽  
P Ramkumar
Keyword(s):  
Surface Texturing ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Tribological Performance ◽  
Friction Reduction ◽  
Hertzian Contact ◽  
Laser Surface Texturing ◽  
Geometrical Parameters ◽  
Area Density ◽  
Biological Environment ◽  
The Individual

This study optimizes the texture geometry by investigating the individual effect of texture depth and area density of cross hatched texture to improve the tribological performance of hip implant at normal walking speed. Texture width was selected conforming to Hertzian contact of Ti6Al4V/ultrahigh molecular weight polyethylene tribo-pair. Crosshatched textures with different depths and area densities were fabricated on polished Ti6Al4V blocks using laser surface texturing technique. Tribology tests were carried out for different loads under bio-lubricated condition. Result shows significant influence of texture depth and area density for better tribological performance of the tribo-pair. Nearly 50% friction reduction and 15 times reduction in wear obtained for 5 µm depth at 25% area density. Surface morphology of worn-out pins showed abrasion wear mechanism.

Coupling Analysis of Fluid Film and Thermal Deformation of Sealing Members in Spiral Groove Mechanical Seal

2007 ◽  
Vol 353-358 ◽  
pp. 2455-2458
Author(s):  
Jian Feng Zhou ◽  
Bo Qin Gu
Keyword(s):  
Thermal Deformation ◽  
Critical Speed ◽  
Fluid Film ◽  
Hydrodynamic Effect ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
Spiral Groove ◽  
Coupling Analysis ◽  
Rotating Speed ◽  
Bearing Force

The thermo-hydrodynamic effect in the spiral groove mechanical seal was investigated. The coupling analysis of the fluid film and the thermal deformation of sealing rings was carried out, the separation angle obtained, and the shape of the gap between the two deformed end faces determined. The results indicate that the increase of the temperature of the fluid film and the thermal deformation of the sealing rings cause the increase of the leakage rate. There exists a critical rotating speed, when the rotating speed is lower than the critical speed, the bearing force increases with the increase of the rotating speed, and once the rotating speed is higher than the critical speed, the bearing force decreases reversely. The thermal deformation weakens the hydrodynamic effect of the spiral groove mechanical seals.

Analysis of the Hydrodynamic Effect in Laser-Textured Mechanical Seal Faces

2010 ◽  
Vol 97-101 ◽  
pp. 4505-4508 ◽  
Author(s):  
Xin Qi Yu ◽  
Pei Ying Peng ◽  
Hui Qin Gao ◽  
He Fang Zhang
Keyword(s):  
Reynolds Equation ◽  
Hydrodynamic Pressure ◽  
Calculation Model ◽  
Operating Conditions ◽  
Pore Geometry ◽  
Hydrodynamic Effect ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
The Finite Difference Method ◽  
Geometry Parameter

A calculation model is developed for mechanical seals with a laser-textured micro-pore face. The dimensionless hydrodynamic pressure distribution on the seal face at various operating conditions and micro-pore geometry parameters is obtained from a solution of the Reynolds equation by the finite difference method. An optimum micro-pore geometry parameter is found and consistent with experimental results. Results of parametric study demonstrate that the substantial hydrodynamic effect can be produced on the seal face with micro-pores.

Sensitivity Analysis for Film Effectiveness on a Round Film Hole Embedded in a Trench Using Conjugate Heat Transfer Numerical Model

2010 ◽  
Author(s):  
Cuong Q. Nguyen ◽  
Nghia V. T. Tran ◽  
Bryan C. Bernier ◽  
Son H. Ho ◽  
Jayanta S. Kapat
Keyword(s):  
Sensitivity Analysis ◽  
Gas Turbine ◽  
Film Cooling ◽  
Numerical Study ◽  
Flux Ratio ◽  
Diameter Ratio ◽  
Geometrical Parameters ◽  
Round Hole ◽  
Cooling Effectiveness ◽  
Film Cooling Effectiveness

Film cooling performance is affected by many factors, for example: geometrical factors (injection angle, length-to-hole diameter ratio, surface roughness, etc.) as well as flow conditions (mass flux ratio, momentum flux ratio, turbulence intensity, etc.). In most of the film cooling literature, film effectiveness has been used as criterion to judge and/or compare between film cooling designs. Uniformity is also a critical factor, since it is determining how well the coolant spreading out downstream to protect the working surface in a gas turbine engine. Better cooling uniformity will reduce thermal stress associated with gas turbine components. A flat plate with round holes embedded in a trench is considered in this study. Although the trench may have an adverse effect on fan-shaped film hole cooling, it tremendously increases the performance of the round-hole film cooling technique in terms of film cooling effectiveness. An experimental study at CATER facility has shown that the cooling effectiveness can be retained by the addition of a trench feature while using only half a number of cooling holes. The current work is conducted based on the numerical study with a validation from in-house experimental works at CATER and the experiments from the literature. The experimental temperature distribution is captured by using Temperature Sensitive Paint and then span-wised effectiveness is calculated. The studied input parameters include flow variables (blowing ratio, BR and momentum ratio, MR) and geometrical parameters (trench-depth-to-diameter ratio, s/D and pitch-to-diameter ratio, p/D). A comparison of contributions of studied factors is investigated by using Response Surface Methodology technique. The spatially adiabatic film cooling effectiveness is selected as the primary output in the design of experimental analysis. Since the nonlinear behavior of all input factors are also of interest, three levels of each parameter will be considered. The well-know Box and Behnken design is employed to carry on this sensitivity analysis. With this method, the current study only requires 25 runs to obtain a quantified comparison of the contribution of each involved effects.

Experimental Investigation on Friction Performance of Mechanical Seals with a Laser-Textured Seal Face

2006 ◽  
Vol 532-533 ◽  
pp. 81-84 ◽  
Author(s):  
Xin Qi Yu ◽  
Mei Hong Liu ◽  
Zhen Hui Wang ◽  
Pei Ying Peng ◽  
Ren Liang Cai
Keyword(s):  
Temperature Rise ◽  
Friction Torque ◽  
Return Flow ◽  
Hydrodynamic Effect ◽  
Mechanical Seals ◽  
Laser Technology ◽  
The Face ◽  
Friction Performance ◽  
Face Structure ◽  
Face Temperature

Regular micro-surface structure in the form of micro-pores produced on the face of mechanical seals by laser technology can be used to improve the friction performance of the seal mating rings. A test rig with variable axial load was used to test laser-textured seal rings with micro-pores of various pore depth and pore ratio to study the effect of the laser-textured seal face structure parameters on the friction performance of mechanical seals. It is found that there are optimum texturing face parameters at which the friction torque and the face temperature rise of seal rings are minimum. Results of these tests show that the micro-pores on one of the seal mating faces can generate substantial hydrodynamic effect. Heat generation due to frictional contact on seal-ring surfaces is a major factor that causes deterioration of face seals and shortens their service life[1,2]. Excessive temperature rise can be avoided by improving structure of a seal surface. By means of laser technology return-flow structure, oblique line groove and spherical micro-pores are engraved on the seal face[3-5]. The research shows that substantial hydrodynamic effect can be generated between the seal faces with micro-pores[6-8]. In this study experiments are performed on laser-textured micro-pores seal faces at various axial loads to investigate the effect of the face structure and operating parameters on friction torque and face temperature rise.

scholarly journals Two-scale homogenization of hydrodynamic lubrication in a mechanical seal with isotropic roughness based on the Elrod cavitation algorithm

2021 ◽  
pp. 135065012110176
Author(s):  
Yanxiang Han ◽  
Qingen Meng ◽  
Gregory de Boer
Keyword(s):  
Surface Topography ◽  
Carrying Capacity ◽  
Hydrodynamic Lubrication ◽  
Tribological Performance ◽  
Stribeck Curve ◽  
Polar Coordinate System ◽  
Load Carrying Capacity ◽  
Mechanical Seal ◽  
Macro Scale ◽  
Load Carrying

A two-scale homogenization method for modelling the hydrodynamic lubrication of mechanical seals with isotropic roughness was developed and presented the influence of surface topography coupled into the lubricating domain. A linearization approach was derived to link the effects of surface topography across disparate scales. Solutions were calculated in a polar coordinate system derived based on the Elrod cavitation algorithm and were determined using homogenization of periodic simulations describing the lubrication of a series of surface topographical features. Solutions obtained for the hydrodynamic lubrication regime showed that the two-scale homogenization approach agreed well with lubrication theory in the case without topography. Varying topography amplitude demonstrated that the presence of surface topography improved tribological performance for a mechanical seal in terms of increasing load-carrying capacity and reducing friction coefficient in the radial direction. A Stribeck curve analysis was conducted, which indicated that including surface topography led to an increase in load-carrying capacity and a reduction in friction. A study of macro-scale surface waviness showed that the micro-scale variations observed were smaller in magnitude but cannot be obtained without the two-scale method and cause significant changes in the tribological performance.

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