Theoretical and experimental research on the micro interface lubrication regime of water lubricated bearing

Xie, Zhongliang; Zhang, Yun; Zhou, Jinzhu; Zhu, Weidong

doi:10.1016/j.ymssp.2020.107422

Cited by 85 publications

(36 citation statements)

References 46 publications

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“…At least three different experiments were conducted for each electrochemical run to guarantee that the results were repeatable. Although the corrosion resistance of the coatings usually evaluated by electrochemical techniques without and with lubricated conditions [28][29][30][31], the present work focused on corrosion tests without lubricating conditions. The information gathered was judged to be statistically significant.…”

Section: Electrochemical Setupmentioning

confidence: 99%

Interfacial Microstructure and Corrosion Behaviour of Mild Steel Coated with Alumina Nanoparticles Doped Tin Composite via Direct Tinning Route

et al. 2021

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The improvement of the surface properties of ferrous metallic materials has become a crucial criterion for advanced engineering applications. The interfacial microstructure and corrosion behaviour of mild steel coated with alumina nanoparticles doped in tin composite using the direct tinning technique were investigated. A coating layer of tin composite containing different loads of Al2O3 nanoparticles (0.25 wt.%, 0.50 wt.%, 1.00 wt.% and 1.5 wt.%) was prepared and directly deposited on a mild steel substrate. This type of a direct tinning process is considered to be a simple and low-cost route for protecting metallic materials from corrosion. It was found that the thickness of both the composite layer and Fe-Sn intermetallic layer at the coated interfaces was highly affected by the presence of alumina nanoparticles that effectively inhibit the diffusion of Sn atoms into the Fe substrate. For the samples coated with lower content of alumina nanoparticles (0.25 wt.% and 0.50 wt.%), the thickness of the Fe-Sn intermetallic coating (IMC) layer is decreased due to Fe-Sn IMC suppression. Otherwise, for the addition of more alumina nanoparticles (1.00 wt.% and 1.50 wt.%), the thickness of the Fe-Sn IMC layer is slightly increased because of nanoparticle’s agglomeration and flotation. It can be reported that the presence of alumina nanoparticles in the coating layer improves, to a great extent, the corrosion resistance of Sn-composites surface on mild steel substrates. Although the tin composite coating layer with a high quantity of alumina nanoparticles (1.0 wt.%) exhibited better corrosion resistance than the other tested samples, such nanoparticle additions have become increasingly difficult to obtain. It was observed that the Al2O3 nanoparticles agglomeration and flotation that were detected in the coating surface may be related to high fraction nanoparticles loading and to the difference in the gravity for Sn and Al2O3 nanoparticles. However, based on our investigation, a coating layer that contains 0.50 wt.% alumina nanoparticles is highly recommended for achieving long lasting and high-performance corrosion resistance for coated mild steel with minimal coating layer defects.

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Section: Electrochemical Setupmentioning

confidence: 99%

Interfacial Microstructure and Corrosion Behaviour of Mild Steel Coated with Alumina Nanoparticles Doped Tin Composite via Direct Tinning Route

et al. 2021

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“…Nikolakopoulos et al [28] indicated that even the aging of engine lubricant results in a different piston ring tribological performance due to the change in lubricant viscosity. To minimize wear and avoid the breakdown of mechanical components, numerous researches [29][30][31][32][33] have suggested changing the surface morphology by artificially creating microscopic features on the surface of sliding pairs. Thus, using an appropriate surface roughness will advance the lubrication performance and minimize the friction and wear in the system [30].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Lubrication Mechanism of Micro-Spherical Solid Particles between Flat Surfaces

Alazemi

2021

Lubricants

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In this study, a novel apparatus was designed and constructed to perform micro-sliding friction experiments while simultaneously observing the motion of micro-sized spheres using a visual inspection technique. The apparatus comprises a precision elevation stage that is used to elevate a flat mica disk, with the microspheres on top of it, to bring it into contact with a stationary surface and apply low loads on the contact. During micro-sliding experiments, it was found that the velocity of the center of the microsphere was half the velocity of the mica disk; in addition, friction force measurements revealed a very low coefficient of friction (about 0.03), indicating the rolling motion of the microspheres. The main outcome of our study was the verification of the hypothesis that spherical particles can be used to avoid direct contact among flat surfaces and can also introduce rolling motion within the system. The pure rolling motion of the microspheres sandwiched between a stationary and a moving flat surface supports the idea of adding rigid spherical particles to oil lubricants to further reduce friction and wear in the system by performing as micro and nanoscale ball bearings.

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“…However, such models assume that a continuous film flows through the packed layer and, thus, the effective liquid behavior, which may also arrange as a collection of rivulets, seriously affecting the efficiency, is not considered. Furthermore, thin liquid layers are also involved in: fluid dynamics inside a lubricated bearing [5][6][7], where the fluid is confined between two solid moving walls and different challenges arise, such as complex regimes map function of velocity and surface topology and roughness, which do not appear in free surface film problems; non-Newtonian fluid motion inside micro-systems [8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Bifurcation Analysis of a Film Flowing over a Patterned Surface through Enhanced Lubrication Theory

Suzzi

Croce

2021

Fluids

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The bifurcation analysis of a film falling down an hybrid surface is conducted via the numerical solution of the governing lubrication equation. Instability phenomena, that lead to film breakage and growth of fingers, are induced by multiple contamination spots. Contact angles up to 75∘ are investigated due to the full implementation of the free surface curvature, which replaces the small slope approximation, accurate for film slope lower than 30∘. The dynamic contact angle is first verified with the Hoffman–Voinov–Tanner law in case of a stable film down an inclined plate with uniform surface wettability. Then, contamination spots, characterized by an increased value of the static contact angle, are considered in order to induce film instability and several parametric computations are run, with different film patterns observed. The effects of the flow characteristics and of the hybrid pattern geometry are investigated and the corresponding bifurcation diagram with the number of observed rivulets is built. The long term evolution of induced film instabilities shows a complex behavior: different flow regimes can be observed at the same flow characteristics under slightly different hybrid configurations. This suggest the possibility of controlling the rivulet/film transition via a proper design of the surfaces, thus opening the way for relevant practical application.

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Theoretical and experimental research on the micro interface lubrication regime of water lubricated bearing

Cited by 85 publications

References 46 publications

Interfacial Microstructure and Corrosion Behaviour of Mild Steel Coated with Alumina Nanoparticles Doped Tin Composite via Direct Tinning Route

Interfacial Microstructure and Corrosion Behaviour of Mild Steel Coated with Alumina Nanoparticles Doped Tin Composite via Direct Tinning Route

Experimental Study of the Lubrication Mechanism of Micro-Spherical Solid Particles between Flat Surfaces

Numerical Bifurcation Analysis of a Film Flowing over a Patterned Surface through Enhanced Lubrication Theory

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