Influence of MHD Lubrication and Textured Surface in EHL Line Contact

Jadhav, Suresh; Thakre, Gananath D.; Sharma, Satish C.

doi:10.3389/fmech.2019.00033

Cited by 4 publications

(4 citation statements)

References 37 publications

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“…The magnetic force exerted on the fluid may involve velocity. Instead of generalized pressure, a new function representing the effect of the magnetic force could be derived and added in the modified Reynolds equation (Hughes and Elco, 1962;Lin et al, 2009;Jadhav et al, 2019).…”

Section: Ferrofluids In Lubricationmentioning

confidence: 99%

Lubrication subjected to effects of electric and magnetic fields: recent research progress and a generalized MEMT-field Reynolds equation

Wang,

Ren

et al. 2024

Front. Mech. Eng.

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Electric and magnetic fields have been used in various ways to enhance the performance of lubrication systems. The presence of these fields can significantly change the properties of lubricants. The rapid adoption of electric vehicles (EVs) has presented new lubrication-related challenges due to the presence of electric current. There is an urgent need for an in-depth study of lubrication systems subjected to such fields. This paper highlights recent research works on several key areas of lubrication involving electric or magnetic fields, which are:1) electric double layer in lubrication, 2) electrorheological fluids, 3) magnetorheological fluids, 4) ferrofluids, and 5) typical fluids used in the current EVs and typical surface failures of bearing components in EVs. Commonly used lubricants in each area are reviewed; lubrication mechanisms and related mathematical models are summarized; methods for and results from numerical analyses and experimental explorations are discussed; and common features of lubrications in different fields are explored. Based on the current research progress in these fields and the classic generalized Reynolds equation, a generalized mechanical-electro-magnetic-thermal-field (MEMT-field) Reynolds equation is proposed to describe the aforementioned lubrication scenarios and the effects of coupled mechanical, electric, magnetic, and thermal fields, which can be solved with a numerical iteration method.

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Section: Ferrofluids In Lubricationmentioning

confidence: 99%

Lubrication subjected to effects of electric and magnetic fields: recent research progress and a generalized MEMT-field Reynolds equation

Wang,

Ren

et al. 2024

Front. Mech. Eng.

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“…Marian et al (Marian et al, 2019) discussed the effects of structural parameters such as the depth and diameter of micro-textures and the relative position of microtexture and counter-body on lubrication and friction on point contact. Jadhav et al (Jadhav et al, 2019) investigated the effects of spherical, rectangular and triangular textures on the lubrication characteristics of line contact EHL based on a magnetohydrodynamic lubrication model. There are many studies on the lubrication characteristics of micro-textured surfaces.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Contact and Lubrication Characteristics of Micro-textured Surface Under Thermal Line Contact EHL

Zhao

Zhou

et al. 2021

Front. Mech. Eng.

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In this study, a method combining numerical surface generation technology and three-dimensional hot-line contact EHL is employed to evaluate the contact characteristics of micro-textured surfaces under high-load line contact. Based on numerical simulation, the film thickness, film pressure, friction coefficient and surface flashing temperature of the virtual texture surface with different cross-sectional shapes and sizes are studied. On this basis, the subsurface stress at the contact point is calculated by the DC-FFT algorithm. The results show that, compared with a smooth surface, the micro-textures of different shapes all increase the average oil film thickness of the surface and reduce the friction coefficient, but at the same time lead to an increase in the contact stress of the surface. By changing the width and depth of the texture, the maximum film pressure has changed by 11.4 and 18.5%, respectively.

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“…Specifically, Gelinck and Schipper 18 found that the lubrication state of the spur gear changed from EHL to mixed lubrication (ML) when the velocity and the roughness of the gear surfaces are changed. With more conditions taken into consideration, Jadhav et al 19 investigated the combined effects of micro-texture and magnetohydrodynamic lubrication behavior on the performance of an EHL line contact. Ebner et al 20 investigated the effect of starved lubrication on the operating behavior of EHL contacts.…”

Section: Introductionmentioning

confidence: 99%

Lubrication state identification of the line contact tribo-pair under a pure rolling condition with ultrasonic method

Duan

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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A line contact tribo-pair is a key mechanism unit in rolling bearings, which is often characterized by ultra-high contact pressure and ultra-thin oil film. Elastohydrodynamic lubrication is often adopted to characterize the lubrication state of such a tribo-pair. As a primary parameter for elastohydrodynamic lubrication, the oil film thickness is often evaluated with simplified theoretical models or complicated measurements. So far, a comprehensive verification of the lubrication states in a real line-contact tribo-pair, however, is rarely reported. Focusing on the roller/ring tribo-pair of a wet-lubricated rolling bearing under pure rolling conditions, this study investigates the lubrication states by integrating multiple theories. Five regions including isoviscous hydrodynamic, piezoviscous hydrodynamic, elastohydrodynamic lubrication, mixture lubrication, and boundary lubrication regions can be identified using the framework. Then, validation experiments are carried out on a line contact tribo-pair test rig under the same operating conditions applied in the theoretical analysis. The oil film thickness is measured by the ultrasonic method. The analysis results demonstrate that only two regions, the elastohydrodynamic lubrication and mixture lubrication regions, can be identified using the experimental data. The identified elastohydrodynamic lubrication and mixture lubrication regions are consistent with theoretical analysis; and the Blok equation and elastohydrodynamic lubrication theory are suggested to calculate the oil film thickness in the elastohydrodynamic lubrication and mixture lubrication regions, respectively. Moreover, the oil film thickness calculated by the Dowson equation is larger than that based on the elastohydrodynamic lubrication theory due to a different viscous pressure equation.

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Influence of MHD Lubrication and Textured Surface in EHL Line Contact

Cited by 4 publications

References 37 publications

Lubrication subjected to effects of electric and magnetic fields: recent research progress and a generalized MEMT-field Reynolds equation

Lubrication subjected to effects of electric and magnetic fields: recent research progress and a generalized MEMT-field Reynolds equation

Prediction of Contact and Lubrication Characteristics of Micro-textured Surface Under Thermal Line Contact EHL

Lubrication state identification of the line contact tribo-pair under a pure rolling condition with ultrasonic method

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