scholarly journals Lubricated textured plan parallel sliding contacts the effect of boundary slip and cavitation

2021 ◽  
Author(s):  
M. Muchammad
Keyword(s):  
Boundary Slip ◽  
Sliding Contacts

A study of surface texturing and boundary slip on improving the load support of lubricated parallel sliding contacts

2012 ◽  
Vol 224 (2) ◽  
pp. 365-381 ◽  
Author(s):  
M. Tauviqirrahman ◽  
R. Ismail ◽  
J. Jamari ◽  
D. J. Schipper
Keyword(s):  
Surface Texturing ◽  
Boundary Slip ◽  
Sliding Contacts

scholarly journals Sliding Contacts in Planetary Magnetospheres

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 283
Author(s):  
Elena Belenkaya ◽  
Igor Alexeev
Keyword(s):  
Large Scale ◽  
Strong Field ◽  
Magnetized Plasma ◽  
Sliding Contacts ◽  
Radio Emissions ◽  
Planetary Magnetospheres ◽  
Current Task ◽  
Surrounding Space ◽  
Non Local ◽  
A Current

In the planetary magnetospheres there are specific places connected with velocity breakdown, reconnection, and dynamo processes. Here we pay attention to sliding layers. Sliding layers are formed in the ionosphere, on separatrix surfaces, at the magnetopauses and boundaries of stellar astrospheres, and at the Alfvén radius in the equatorial magnetosphere of rapidly rotating strongly magnetized giant planets. Although sliding contacts usually occur in thin local layers, their influence on the global structure of the surrounding space is very great. Therefore, they are associated with non-local processes that play a key role on a large scale. There can be an exchange between different forms of energy, a generation of strong field-aligned currents and emissions, and an amplification of magnetic fields. Depending on the conditions in the magnetosphere of the planet/exoplanet and in the flow of magnetized plasma passing it, different numbers of sliding layers with different configurations appear. Some are associated with regions of auroras and possible radio emissions. The search for planetary radio emissions is a current task in the detection of exoplanets.

scholarly journals Numerical Investigation for the Resin Filling Behavior during Ultraviolet Nanoimprint Lithography of Subwavelength Moth-Eye Nanostructure

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 799
Author(s):  
Yuanchi Cui ◽  
Xuewen Wang ◽  
Chengpeng Zhang ◽  
Jilai Wang ◽  
Zhenyu Shi
Keyword(s):  
Simulation Model ◽  
Nanoimprint Lithography ◽  
Cfd Simulation ◽  
Boundary Slip ◽  
Accurate Analysis ◽  
Inlet Velocity ◽  
Filling Height ◽  
Proposed Model ◽  
Good Consistency ◽  
Computational Fluid Dynamics Cfd

Accurate analysis of the resin filling process into the mold cavity is necessary for the high-precision fabrication of moth-eye nanostructure using the ultraviolet nanoimprint lithography (UV-NIL) technique. In this research, a computational fluid dynamics (CFD) simulation model was proposed to reveal resin filling behavior, in which the effect of boundary slip was considered. By comparison with the experimental results, a good consistency was found, indicating that the simulation model could be used to analyze the resin filling behavior. Based on the proposed model, the effects of process parameters on resin filling behavior were analyzed, including resin viscosity, inlet velocity and resin thickness. It was found that the inlet velocity showed a more significant effect on filling height than the resin viscosity and thickness. Besides, the effects of boundary conditions on resin filling behavior were investigated, and it was found the boundary slip had a significant influence on resin filling behavior, and excellent filling results were obtained with a larger slip velocity on the mold side. This research could provide guidance for a more comprehensive understanding of the resin filling behavior during UV-NIL of subwavelength moth-eye nanostructure.

scholarly journals Boundary slip measurement and mechanism analysis in ultraviolet nanoimprint lithography of subwavelength moth-eye nanostructure

Procedia CIRP ◽  
2020 ◽  
Vol 95 ◽  
pp. 155-160
Author(s):  
Chengpeng Zhang ◽  
Shuai Chen ◽  
Zhaoliang Jiang ◽  
Cheng Zhang ◽  
Li Zhao
Keyword(s):  
Nanoimprint Lithography ◽  
Mechanism Analysis ◽  
Boundary Slip

Multiscale Analysis on Friction-Reducing Characteristics of Textured Surface in Nanoscale Sliding Contacts

2011 ◽  
Vol 86 ◽  
pp. 649-652
Author(s):  
Rui Ting Tong ◽  
Geng Liu ◽  
Lan Liu ◽  
Shang Jun Ma
Keyword(s):  
Copper Substrate ◽  
Dynamics Simulation ◽  
Textured Surface ◽  
Face Centered Cubic ◽  
Textured Surfaces ◽  
Sliding Contacts ◽  
Friction Forces ◽  
Surface Textures ◽  
Force Reduction ◽  
Face Centered

A multiscale method coupled molecular dynamics simulation and finite element method is used to investigate two dimensional nanoscale sliding contacts between a rigid cylindrical tip and an elastic face centered cubic copper substrate with textured surface, in which adhesive effects are considered. Two series of nanoscale surface textures with different asperity shape, different asperity heights and different spacing between asperities are designed. Through the friction forces comparisons between smooth surface and textured surfaces, a better shape is advised to indicate that asperity shape plays an important role in friction force reduction. With proper asperity height and proper spacing between asperities, surface textures can reduce friction forces effectively.

An analytical approach on the tribological behaviour of pocketed slider bearings with boundary slip including cavitation

2016 ◽  
Vol 29 (3) ◽  
pp. 133-152 ◽  
Author(s):  
M. Muchammad ◽  
Mohammad Tauviqirrahman ◽  
J. Jamari ◽  
Dirk Jan Schipper
Keyword(s):  
Analytical Approach ◽  
Boundary Slip ◽  
Tribological Behaviour ◽  
Slider Bearings
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