The Experts below are selected from a list of 221436 Experts worldwide ranked by ideXlab platform
Bernard Tournerie - One of the best experts on this subject based on the ideXlab platform.
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experimental and numerical study of the lubrication regimes of a liquid Mechanical Seal
Tribology International, 2015Co-Authors: K Ayadi, Noel Brunetiere, Bernard Tournerie, A MaouiAbstract:Abstract The paper presents an experimental and numerical study of the different lubrication regimes occurring in the Sealing gap of a Mechanical Seal with water as Sealed fluid. For this purpose, an industrial Seal has been tested in a wide range of rotation speeds and fluid pressure values. Friction torque, temperature and leakage were measured and compared to numerical results. These results were obtained on a multi-scale mixed lubrication model considering heat transfer in the solids and Seal rings deflections. A satisfactory correlation was obtained demonstrating the relevance of the model. The model is then used to analyze the lubrication regimes.
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study of the fluid film vaporization in the interface of a Mechanical face Seal
Tribology International, 2015Co-Authors: F Migout, Noel Brunetiere, Bernard TournerieAbstract:Abstract This paper presents numerical simulations of the effect of an increase in feeding temperature on a Mechanical Seal operating with water. A transient numerical model using the homogeneous fluid theory was developed to analyze the vaporization of the fluid film in a Mechanical Seal interface. Heat transfer in the contiguous solids and faces deformations are considered. After a validation of the model by comparison with experiments, a parametric study is presented. For moderate temperature rise, the vaporization of the fluid in the contact has no significant effect on the Seal performance. However, above a temperature threshold, the Mechanical Seal can exhibit unstable behavior which can be detrimental for its life expectancy.
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numerical analysis of a surface textured Mechanical Seal operating in mixed lubrication regime
Tribology International, 2012Co-Authors: Noel Brunetiere, Bernard TournerieAbstract:Abstract This paper presents a numerical study of the behavior of a Mechanical Seal with textured surfaces. It is used to analyze the mechanisms underlying the enhancement of the hydrodynamic lift associated with surface texture in Mechanical Seals. The model solves the Reynolds equation coupled with a mass-conservative cavitation algorithm and takes into account asperity contact. It is shown that, unlike rough-textured surfaces, smooth-textured surfaces are unable to generate a load. The performance of two rough surfaces are compared with those of the same surfaces equipped with dimples. The effect of texture density and aspect ratio are studied as well.
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analysis and modeling of the topography of Mechanical Seal faces
Tribology Transactions, 2010Co-Authors: Christophe Minet, Noel Brunetiere, Bernard Tournerie, Didier FribourgAbstract:The aim of this article is to provide some relevant statistical parameters for Mechanical Seal faces and to present some methods of modelling them in order to study mixed lubrication. Three Mechanical Seals with faces of three different material combinations were analyzed at three operating times (unused, run-in, and worn). Surface roughness and waviness were analyzed. Generally speaking, the amplitude of the waves tends to increase with time, whereas roughness height shows the opposite trend, except in the case of the hard faces combination. The Seal surfaces are extremely skewed, this phenomenon being enhanced by wear. The surfaces are nearly isotropic with a slightly higher correlation length in the sliding direction. Two models with two different autocorrelation functions (ACFs) were used to simulate surfaces. These models, based on the Patir approach (Patir (1)), used the Johnson translation curves to impose non-Gaussian height distribution. Even if the models are able to reproduce experimental tende...
Noel Brunetiere - One of the best experts on this subject based on the ideXlab platform.
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experimental and numerical study of the lubrication regimes of a liquid Mechanical Seal
Tribology International, 2015Co-Authors: K Ayadi, Noel Brunetiere, Bernard Tournerie, A MaouiAbstract:Abstract The paper presents an experimental and numerical study of the different lubrication regimes occurring in the Sealing gap of a Mechanical Seal with water as Sealed fluid. For this purpose, an industrial Seal has been tested in a wide range of rotation speeds and fluid pressure values. Friction torque, temperature and leakage were measured and compared to numerical results. These results were obtained on a multi-scale mixed lubrication model considering heat transfer in the solids and Seal rings deflections. A satisfactory correlation was obtained demonstrating the relevance of the model. The model is then used to analyze the lubrication regimes.
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study of the fluid film vaporization in the interface of a Mechanical face Seal
Tribology International, 2015Co-Authors: F Migout, Noel Brunetiere, Bernard TournerieAbstract:Abstract This paper presents numerical simulations of the effect of an increase in feeding temperature on a Mechanical Seal operating with water. A transient numerical model using the homogeneous fluid theory was developed to analyze the vaporization of the fluid film in a Mechanical Seal interface. Heat transfer in the contiguous solids and faces deformations are considered. After a validation of the model by comparison with experiments, a parametric study is presented. For moderate temperature rise, the vaporization of the fluid in the contact has no significant effect on the Seal performance. However, above a temperature threshold, the Mechanical Seal can exhibit unstable behavior which can be detrimental for its life expectancy.
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numerical analysis of a surface textured Mechanical Seal operating in mixed lubrication regime
Tribology International, 2012Co-Authors: Noel Brunetiere, Bernard TournerieAbstract:Abstract This paper presents a numerical study of the behavior of a Mechanical Seal with textured surfaces. It is used to analyze the mechanisms underlying the enhancement of the hydrodynamic lift associated with surface texture in Mechanical Seals. The model solves the Reynolds equation coupled with a mass-conservative cavitation algorithm and takes into account asperity contact. It is shown that, unlike rough-textured surfaces, smooth-textured surfaces are unable to generate a load. The performance of two rough surfaces are compared with those of the same surfaces equipped with dimples. The effect of texture density and aspect ratio are studied as well.
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analysis and modeling of the topography of Mechanical Seal faces
Tribology Transactions, 2010Co-Authors: Christophe Minet, Noel Brunetiere, Bernard Tournerie, Didier FribourgAbstract:The aim of this article is to provide some relevant statistical parameters for Mechanical Seal faces and to present some methods of modelling them in order to study mixed lubrication. Three Mechanical Seals with faces of three different material combinations were analyzed at three operating times (unused, run-in, and worn). Surface roughness and waviness were analyzed. Generally speaking, the amplitude of the waves tends to increase with time, whereas roughness height shows the opposite trend, except in the case of the hard faces combination. The Seal surfaces are extremely skewed, this phenomenon being enhanced by wear. The surfaces are nearly isotropic with a slightly higher correlation length in the sliding direction. Two models with two different autocorrelation functions (ACFs) were used to simulate surfaces. These models, based on the Patir approach (Patir (1)), used the Johnson translation curves to impose non-Gaussian height distribution. Even if the models are able to reproduce experimental tende...
Jian Feng Zhou - One of the best experts on this subject based on the ideXlab platform.
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experimental study on the hydrodynamic lubrication characteristics of magnetofluid film in a spiral groove Mechanical Seal
Tribology International, 2016Co-Authors: Jian Feng Zhou, Haoliang Fan, Chunlei ShaoAbstract:Abstract This work presents an experimental study on the lubrication characteristics of the magnetofluid film in a spiral groove Mechanical Seal to reveal how the magnetic field affects the hydrodynamic effect of magnetofluid. The experiments are carried out based on the non-contact Mechanical Seal experimental rig and the influences of the magnetic field intensity and the rotational speed on the film thickness, friction torque, characteristic temperature and magnetofluid depletion are investigated experimentally. By numerically analyzing the film pressure distribution, it is revealed that the hydrodynamic pressure increases with the increasing magnetic field intensity. Using an appropriate closing force, it is feasible to control the Seal capacity of the Seal by regulating the current intensity in the magnetic field generator.
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Coupling Analysis of Fluid Film and Thermal Deformation of Sealing Members in Spiral Groove Mechanical Seal
Key Engineering Materials, 2007Co-Authors: Jian Feng Zhou, Bo Qin GuAbstract: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.
Chunlei Shao - One of the best experts on this subject based on the ideXlab platform.
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experimental study on the hydrodynamic lubrication characteristics of magnetofluid film in a spiral groove Mechanical Seal
Tribology International, 2016Co-Authors: Jian Feng Zhou, Haoliang Fan, Chunlei ShaoAbstract:Abstract This work presents an experimental study on the lubrication characteristics of the magnetofluid film in a spiral groove Mechanical Seal to reveal how the magnetic field affects the hydrodynamic effect of magnetofluid. The experiments are carried out based on the non-contact Mechanical Seal experimental rig and the influences of the magnetic field intensity and the rotational speed on the film thickness, friction torque, characteristic temperature and magnetofluid depletion are investigated experimentally. By numerically analyzing the film pressure distribution, it is revealed that the hydrodynamic pressure increases with the increasing magnetic field intensity. Using an appropriate closing force, it is feasible to control the Seal capacity of the Seal by regulating the current intensity in the magnetic field generator.
Xuhui Zhou - One of the best experts on this subject based on the ideXlab platform.
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Research on Sealing Properties and its Influence Factors of Spherical Mechanical Seal Based on ANSYS
The Open Mechanical Engineering Journal, 2016Co-Authors: Xuhui Zhou, Xingxin Liang, Huanjie Wang, Jun De YangAbstract:When a marine stern shaft is bent with shafting misalignment and stern bearing wear factors, etc., the Sealing properties of a plane Mechanical Seal is declined with the increase of both contact pressure and temperature of Sealing surface, so a spherical Mechanical Seal which can automatically adjust the contact state of Sealing surfaces is proposed to replace the plane Mechanical Seal in order to solve the aforementioned problems. The Sealing properties of a spherical Mechanical Seal is directly influenced by the Sealing structure size such as Sealing spherical radius, the distance between stator and rotary ring seats, inner and outer diameters of stator ring. The thermal-structure coupling model of the spherical Mechanical Seal in underwater vehicles is built with ANSYS finite element method, and the influence of structure size on the Sealing performances of the spherical Mechanical Seal is discussed. The study results show that as spherical radius is increased, the contact region of spherical Sealing surfaces is decreased and the opening region is expanded, and the highest temperature and maximum contact pressure on the spherical Sealing surfaces are raised. As inner or outer diameter of stator ring is increased, the maximum contact pressure of the former is raised, and one of the latter is declined, but the highest temperatures of both on Sealing surfaces are enhanced linearly. When the distance between static and rotary ring seats is increased, the highest temperature of Sealing surface and maximum contact pressure are increased in a nonlinear way. These conclusions are of important theoretical significance and engineering application value for the structure optimization of spherical Mechanical Seals in vessels, particularly underwater vehicles.
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The Simulation Analysis of Spherical Mechanical Seal of Stern Shaft
Proceedings of the 2015 International Industrial Informatics and Computer Engineering Conference, 2015Co-Authors: Xuhui Zhou, Xiangkun MengAbstract:The simulation of spherical Mechanical Seal is carried out with ANSYS finite element method, and the influence of sea water pressure, shaft speed and other factors on the spherical Mechanical Seal performance discussed. The study shows that local contact situation of the spherical Mechanical Seal is closed to the outside edge of the spherical Seal ring, and both maximum contact pressure and temperature are too. These research results are of important theoretical significance and engineering application value for the development of the new kind of Mechanical Seal and improvement of both safety and survivability of ships.
