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Influence of thermal effects on elastohydrodynamic (EHD) lubrication behavior at high speeds

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Abstract

This paper describes a study of point contact elastohydrodynamic (EHD) lubrication behavior at high speeds (up to 20 m s−1). Central film thicknesses were measured by optical interferometry device. The influence of slide-roll ratio and operating temperature on the central film thickness was determined. The influence of thermal effects on the reduction of film thickness was discussed via the analysis of numerical simulation method considering thermal effects. Subsequently, the experimental data was used to amend a set of unified parameters for the thermal corrections for different types of oil at high speeds.

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Abbreviations

L :

Thermal loading parameter

E 1,E 2 :

Elastic modulus of ball and disc (Pa)

E′:

Reduced modulus (Pa)

υ 1, υ 2 :

Poisson ratio of disc and ball

R x :

Radius of ball (m)

t :

Temperature (K)

t 0 :

Operating temperature (K)

ρ, ρ 1, ρ 2 :

Density of oil, glass disc and steel ball (kg m−3)

k, k 1, k 2 :

Thermal conductivity of oil, glass disc and steel-ball (W m−1 K−1)

c, c 1, c 2 :

Specific heat of oil, glass disc and steel ball (W m−1 K−1)

η :

Dynamic viscosity (Pa s)

η 0 :

Ambient viscosity (Pa s)

α :

Barus viscosity-pressure coefficient (Pa−1)

S 0 :

Roelands viscosity-temperature coefficient (K−1)

SRR :

Slide-roll ratio SRR=2((u 1−u 2)/(u 1−u 2)

h :

Film thickness (nm)

p :

Film pressure (Pa)

pH :

Maximum Herzian pressure (Pa)

u :

Lubricant entrainment speed, u=(u 1 +u 2)/2

u 1,u 2 :

Surface velocities of disc and ball, u 1>u 2 (m s−1)

w :

Load (N)

x :

Coordinate along the entrainment speed (m)

y :

Coordinate perpendicular to the entrainment speed (m)

z :

Coordinate along the film thickness (m)

H :

Dimensionless film thickness, H=hR x /B 2

P :

Dimensionless pressure, P=p/p H

G :

Dimensionless material parameter, G=αE′

U :

Dimensionless velocity parameter, U=η 0 u/E′R x

W :

Dimensionless load parameter, W=w/E′R x 2

B :

Radius of Hertzian contact (m)

X :

Dimensionless coordinate along the entrainment speed, X=x/B

Y :

Dimensionless coordinate perpendicular to the entrainment speed, Y=y/B

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Authors and Affiliations

  1. State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China

    He Liang, Dan Guo & JianBin Luo

  2. Tribology Group, Department of Mechanical Engineering, Imperial College London, London, SW7 2AZ, UK

    He Liang, Tom Reddyhoff & Hugh Spikes

Authors
  1. He Liang
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  2. Dan Guo
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  3. Tom Reddyhoff
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  4. Hugh Spikes
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  5. JianBin Luo
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Correspondence to Dan Guo.

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Liang, H., Guo, D., Reddyhoff, T. et al. Influence of thermal effects on elastohydrodynamic (EHD) lubrication behavior at high speeds. Sci. China Technol. Sci. 58, 551–558 (2015). https://doi.org/10.1007/s11431-014-5564-7

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  • DOI: https://doi.org/10.1007/s11431-014-5564-7

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