Behavior of Viscosity Index Improver-Containing Oils in Non-Steady State Contacts

1998 ◽  
Author(s):  
Selda Gunsel ◽  
Matthew Smeeth ◽  
Hugh Spikes
Keyword(s):  
Steady State ◽  
Viscosity Index ◽  
Viscosity Index Improver ◽  
Index Improver

scholarly journals Application of Rabinowitsch Fluid Model to Pivoted Curved Slider Bearings

2013 ◽  
Vol 60 (2) ◽  
pp. 247-267 ◽  
Author(s):  
Udaya Pratap Singh
Keyword(s):  
Steady State ◽  
Carrying Capacity ◽  
Fluid Model ◽  
Dynamic Stiffness ◽  
Viscosity Index ◽  
Load Carrying Capacity ◽  
Viscosity Index Improver ◽  
Dynamic Damping ◽  
Load Carrying ◽  
Index Improver

In the present theoretical analysis, the combined effects of slider curvature and non-Newtonian pseudoplastic and dilatant lubricants (lubricant blended with viscosity index improver) on the steady and dynamic characteristics of pivoted curved slider bearings have been investigated for Rabinowitsch fluid model. The modified Reynolds equations have been obtained for steady and damping states of bearing. To solve the modified Reynolds equations, perturbation theory has been adopted. The results for the steady state characteristics (steady state film pressure, load carrying capacity and centre of pressure) and dynamic characteristics (dynamic damping and dynamic stiffness) have been calculated numerically for various values of viscosity index improver using Mathematica. In comparison with the Newtonian lubricants, higher values of film pressure, load carrying capacity, dynamic damping and dynamic stiffness have been obtained for dilatant lubricants, while the case was reversed for pseudoplastic lubricants. Significant variations in the bearing characteristics have been observed for even small values of pseudoplastic parameter, that is, with the non-Newtonian dilatant and pseudoplastic behaviour of the fluid.

Evaluation of a Butadiene-Styrene Viscosity Index Improver

1976 ◽  
Author(s):  
W. L. Streets ◽  
K. H. Yochum ◽  
Bill Mitacek
Keyword(s):  
Viscosity Index ◽  
Viscosity Index Improver ◽  
Index Improver ◽  
Butadiene Styrene

scholarly journals Dual functional star polymers for lubricants

RSC Advances ◽  
2016 ◽  
Vol 6 (89) ◽  
pp. 86259-86268 ◽  
Author(s):  
Lelia Cosimbescu ◽  
Joshua W. Robinson ◽  
Yan Zhou ◽  
Jun Qu
Keyword(s):  
Viscosity Index ◽  
Star Polymers ◽  
Friction Modifier ◽  
Alkyl Methacrylate ◽  
Viscosity Index Improver ◽  
Engine Oils ◽  
Dual Functional ◽  
Index Improver

Star-shaped poly(alkyl methacrylate)s (PAMAs) with a 3-arm architecture were designed, prepared and their performance as a dual additive (viscosity index improver and friction modifier) for engine oils was evaluated.

scholarly journals Contribution of Viscosity Index Improver to Fuel Economy

2019 ◽  
Vol 14 (5) ◽  
pp. 404-410
Author(s):  
Yasuaki Inoue ◽  
Kien-Wee Tan ◽  
Philip A. Hutchinson ◽  
Boris Eisenberg ◽  
Frank Lauterwasser
Keyword(s):  
Fuel Economy ◽  
Viscosity Index ◽  
Viscosity Index Improver ◽  
Index Improver

scholarly journals Polyacrylate-magnetite nanocomposite as a potential multifunctional additive for lube oil

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Koushik Dey ◽  
Gobinda Karmakar ◽  
Mahua Upadhyay ◽  
Pranab Ghosh
Keyword(s):  
Viscosity Index ◽  
Analytical Techniques ◽  
Base Stock ◽  
Multifunctional Additive ◽  
Viscosity Index Improver ◽  
Point Depressant ◽  
Index Improver ◽  
Overall Performance ◽  
Mineral Base

Abstract The application of polymer nanocomposites (PNCs) in lubricant industry has attracted considerable interest due to their much enhanced properties compared to neat polymers. In this study, magnetite (Fe3O4) nanoparticles (NPs) were synthesized. Then PNCs were prepared by reinforcing these NPs in the homopolymer of dodecyl acrylate in different percentages. The characterization of the prepared NPs and PNCs was done by different analytical techniques. Thermal stability is determined through thermogravimetric analysis (TGA). Performance evaluation of the PNCs as viscosity index improver, pour point depressant and antiwear additive was carried out by blending them with a mineral base stock at different percentage ratios. Standard ASTM methods are followed to carry out the evaluations. It is found that with increasing the percentage of nanocomposites in the base stock, the overall performance of the furnished lubricant is enhanced.

Consideration about dynamic conduct of viscosity index improver in the share field

2020 ◽  
Vol 2020 (0) ◽  
pp. S11333
Author(s):  
Gentaro SAWAI ◽  
Hiroki KAWATE ◽  
Soma USUI ◽  
Hitoshi WASHIZU
Keyword(s):  
Viscosity Index ◽  
Viscosity Index Improver ◽  
Index Improver
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