Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Snapshot of a MD system featuring a hybrid interface. In this reference configuration, n-octane is confined between ferrite and silicon nitride walls under typical EHD operating conditions (u2 = −u1 = 1 m/s, P = 1 GPa).

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Dependence of the dimensionless slip parameter s (a) and slip length Ls/Ls,ref, and (b) with the inverse of the film thickness 1/h. α-Fe [110] and Si3N4 [001] surfaces, n-octane, Δu = 2 m/s, P = 1 GPa, and Twall = 303 K.

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Dependence of the dimensionless slip parameter s (a) and slip length Ls/Ls,ref, and (b) with pressure P. α-Fe [110] and Si3N4 [001] surfaces, n-octane, Δu = 2 m/s, h = 5 nm, and Twall = 303 K.

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Combined dependence of the dimensionless slip length Ls/Ls,ref with the operating conditions. (a) Wall velocity difference Δu and inverse of film thickness (1/h). (b) Wall velocity difference Δu and pressure P. (c) Inverse of film thickness (1/h) and pressure P.

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Schematic representation of the EHD contact geometry. (a) Line contact between a plane and a cylinder. (b) Equivalent formulation for the numerical resolution.

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Viscosity increase with the film thickness for confined n-octane in comparison with the bulk viscosity value. α-Fe [110] and Si3N4 [001] surfaces, Δu = 2 m/s, P = 1 GPa, and Twall = 303 K.

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Flow chart of the multiscale approach for the coupling of nanoscale and macroscopic models

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Velocity profiles at the contact inlet (a) and center (b) for the steel–ceramic hybrid contact at SRR = 0: nano-to-EHL model with slip on the lower wall (solid curves) compared to the classical no-slip solution (dashed curves)

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Film thickness dependence on the SRR for the hybrid contact. Variations in h are observed for the nano-to-EHL model with slip, in contrast with the standard no-slip Reynolds solution where the film thickness is independent on SRR.

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Film thickness (a) and pressure (b) distributions from the nano-to-EHL approach compared to the classical no-slip solution, for the hybrid contact in a pure rolling configuration

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Velocity profiles at the inlet and center of the hybrid contact for the nano-to-EHL model with slip compared to the classical no-slip solution. (a) and (b) SRR = 2: the lower (slipping) wall is stationary. (c) and (d) SRR = −2: the upper (nonslipping) wall is immobile.

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Mass flow of the lubricant as a function of the SRR in an hybrid contact. Comparison between the nano-to-EHL model with slip on the lower wall with the standard no-slip Reynolds solution.

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Friction coefficient as a function of the SRR in an hybrid contact. Comparison between the nano-to-EHL model with slip on the lower wall and standard no-slip Reynolds solution.

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Dependence of the dimensionless slip length Ls/Ls,ref with the wall speeds difference Δu. α-Fe [110] and Si3N4 [001] surfaces, n-octane, P = 1 GPa, h = 5 nm, and Twall = 303 K.

Date of download: 10/16/2017 Copyright © ASME. All rights reserved. From: A Multiscale Study on the Wall Slip Effect in a Ceramic–Steel Contact With Nanometer-Thick Lubricant Film by a Nano-to-Elastohydrodynamic Lubrication Approach J. Tribol. 2015;137(3):031502-031502-13. doi:10.1115/1.4029937 Figure Legend: Velocity profile across a n-octane film confined between an upper Si3N4 and a lower Fe surfaces under typical EHD operating conditions. The imposed wall speeds u1 = −1 m/s and u2 = 1 m/s along the x-direction are represented by the blue arrows, whereas the fluid velocity is shown by the gray dots. P = 1 GPa, h = 5 nm, and Twall = 303 K.