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Keywords: viscosity
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Journal Articles
Article Type: Research Papers
J. Tribol. November 2021, 143(11): 111805.
Paper No: TRIB-21-1086
Published Online: June 18, 2021
... by the Tribology Division of ASME for publication in the J ournal of T ribology . 11 02 2021 28 05 2021 28 05 2021 18 06 2021 planetary gears splash lubrication power losses lubricants viscosity Since planetary gearboxes are compact, they are widely used in different...
Journal Articles
Article Type: Research Papers
J. Tribol. December 2021, 143(12): 121806.
Paper No: TRIB-21-1059
Published Online: May 18, 2021
... 2021 18 05 2021 abrasion clutches hydrodynamic lubrication interface rheology surface properties and characterization surface treatments viscosity wear It is interesting to mix any additive in colloidal suspension because of its complexity over its properties...
Journal Articles
Article Type: Research Papers
J. Tribol. May 2021, 143(5): 051103.
Paper No: TRIB-20-1540
Published Online: February 26, 2021
... = coefficients of the empirical curve describing relationship between C f and Re P, Δ P = air pressure and pressure difference, respectively (Pa) Ra = the average deviation of the roughness irregularities from the mean line Re = Reynolds number μ = viscosity coefficient (Pa · s...
Journal Articles
Article Type: Research Papers
J. Tribol. September 2021, 143(9): 091801.
Paper No: TRIB-20-1377
Published Online: December 22, 2020
... agreement of torque transmission for different groove profiles with experiments. Finally, temperature distribution patterns in different three MR clutches and an optimization of the radial groove profile have been analyzed numerically. After computing the CFD module, simulated dynamic viscosity...
Journal Articles
Article Type: Research Papers
J. Tribol. June 2021, 143(6): 061901.
Paper No: TRIB-20-1312
Published Online: October 27, 2020
...Thomas J. Zolper; Scott Bair; Kyle Horne The ASME Pressure-Viscosity Report was a seminal publication on high pressure-viscosity and density supervised by the ASME Research Committee on Lubrication, sponsored by dozens of industries, and undertaken by Harvard University using high-pressure...
Journal Articles
Article Type: Research Papers
J. Tribol. March 2021, 143(3): 031803.
Paper No: TRIB-19-1508
Published Online: September 21, 2020
...Dongil Shin; Jongin Yang; Xiaomeng Tong; Junho Suh; Alan Palazzolo Traditional analysis of journal bearings assumed a constant viscosity which simplified the solutions for static and dynamic characteristics and responses. Today's high-performance machinery requires more accurate models wherein...
Journal Articles
Article Type: Technical Briefs
J. Tribol. March 2020, 142(3): 034501.
Paper No: TRIB-19-1217
Published Online: November 19, 2019
... Shared first authorship. Contributed by the Tribology Division of ASME for publication in the J ournal of T ribology . 21 05 2019 09 09 2019 09 09 2019 10 10 2019 grease lubrication lubricants rheology viscosity Greases play an important role...
Journal Articles
Article Type: Research-Article
J. Tribol. February 2019, 141(2): 021802.
Paper No: TRIB-18-1154
Published Online: October 11, 2018
...Scott Bair; Samuel Flores-Torres Understanding the pressure and shear dependence of viscosity is essential to an understanding of the mechanisms of film forming and friction in concentrated contacts. The blending of different molecular mass polyalphaolefins (PAOs) may permit the formulator...
Journal Articles
Article Type: Research-Article
J. Tribol. November 2018, 140(6): 061801.
Paper No: TRIB-17-1439
Published Online: May 28, 2018
... of polyvinylpyrrolidone caused the improvement in dynamic viscosity at lower shear rates and a significant change of viscosity in low temperatures. An increased value of the yield point of the tested lubricating compositions after introduction of the additive was also observed. The measure for antiscuffing properties...
Journal Articles
Article Type: Technical Briefs
J. Tribol. May 2018, 140(3): 034501.
Paper No: TRIB-17-1253
Published Online: January 16, 2018
...Peter Christiansen; Niels Schmidt Hansen; Martin Thomas Overdahl Lund; Jon Spangenberg; Niels Bay This paper describes the construction and testing of a simple, experimental tool setup that enables determination of the pressure–viscosity relationship for high viscosity oils. Comparing...
Journal Articles
Article Type: Research-Article
J. Tribol. May 2018, 140(3): 031701.
Paper No: TRIB-17-1120
Published Online: October 23, 2017
... condition. The traditional opinion that effective viscosity decreases with increasing temperature cannot completely explain this phenomenon. In this study, the air entrainment effect is introduced and evaluated using computational fluid dynamics (CFD). CFD results considering air entrainment, viscous...
Journal Articles
Article Type: Research-Article
J. Tribol. March 2018, 140(2): 021701.
Paper No: TRIB-16-1300
Published Online: September 29, 2017
... responses and their solution manifolds are obtainable and stretch out with selections of pad preload, pivot offset, and lubricant viscosity so that the periodic doubling bifurcations, saddle node bifurcations, and corresponding local stability are reliably determined by searching parameter sets. In case...
Journal Articles
Article Type: Research-Article
J. Tribol. January 2018, 140(1): 011403.
Paper No: TRIB-17-1042
Published Online: August 2, 2017
... other physical quantities, on the small wavelength truncation of roughness, which is hard to define with some physical argument, rather than just as a best fit fitting free parameter. Friction Interface Sliding Surface roughness Viscosity Asperities 01 02 2017 27 04 2017...
Journal Articles
Article Type: Research-Article
J. Tribol. November 2017, 139(6): 061607.
Paper No: TRIB-16-1400
Published Online: July 10, 2017
...Wei Dai; Kyungjun Lee; Alexander M. Sinyukov; Hong Liang In this research, rheological and tribological performance of additive V 2 O 5 nanoparticles in a light mineral oil has been investigated. For rheological performance, the addition of 0.2 wt. % V 2 O 5 could reduce the viscosity of the base...
Journal Articles
Article Type: Research-Article
J. Tribol. November 2017, 139(6): 061701.
Paper No: TRIB-16-1226
Published Online: July 10, 2017
... ∂ T ∂ x + v ∂ T ∂ y + w ∂ T ∂ z } = K ∂ 2 T ∂ y 2 + η { ( ∂ u ∂ y ) 2 + ( ∂ w ∂ y ) 2 } Temperature rise in the lubricant reduces its viscosity, this changes the slip coefficient...
Journal Articles
Article Type: Research-Article
J. Tribol. November 2017, 139(6): 061501.
Paper No: TRIB-16-1303
Published Online: June 7, 2017
... between the reduction in viscosity of the oil and the reduction of refrigerant concentration with increased temperature. For high inlet pressure, the dilution effect is dominant, whereas for low inlet pressure, the temperature dependence of the viscosity of the solution dominates over the range of inlet...
Journal Articles
Article Type: Research-Article
J. Tribol. July 2017, 139(4): 041702.
Paper No: TRIB-16-1238
Published Online: April 4, 2017
... with experimental data [ 24 ] Figure 6 presents Morton's experimental results and this model's calculations, relating relative eccentricity and Sommerfeld number. A close correspondence is observed, with calculations made for two viscosities. Figure 7 compares Morton's experimental measurements...
Journal Articles
Article Type: Research-Article
J. Tribol. January 2017, 139(1): 011707.
Paper No: TRIB-16-1044
Published Online: August 16, 2016
... ( = c / l ) or increase in length ( l ) of micropolar lubricant particles increases h ¯ min . The thermal effects significantly reduce minimum fluid film thickness values due to reduction in viscosity. For a fixed value of C ¯ s 2 and l m , h...
Journal Articles
Article Type: Research-Article
J. Tribol. March 2017, 139(2): 021504.
Paper No: TRIB-16-1030
Published Online: August 11, 2016
... between their additive content and tribological performance. Gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR) spectroscopy were used to characterize the molecular masses and structures, respectively. Density, viscosity, EHD film thickness, and friction were measured at 303 K, 348 K...
Journal Articles
Article Type: Research-Article
J. Tribol. January 2017, 139(1): 011801.
Paper No: TRIB-15-1363
Published Online: July 26, 2016
...Scott Bair; Tsuyoshi Yamaguchi Measurements are reported for dipentaerythritol hexaisononanoate (DiPEiC9) of pressure–volume–temperature (pVT) response to pressures to 400 MPa and temperatures to 100 °C, and of viscosity at pressures to 700 MPa and temperatures to 90 °C and shear stress to 18 MPa...