Thermohydrodynamic Analysis of Surface Roughness in the Flow Field

[+] Author and Article Information
Joon Hyun Kim, Joo-Hyun Kim

School of Mechanical and Automotive Engineering, Kookmin University, 861-1 Chongnung-dong, Songbuk-gu, Seoul 136-702 Korea

J. Tribol 127(2), 293-301 (Apr 07, 2005) (9 pages) doi:10.1115/1.1828072 History: Received December 18, 2003; Revised August 30, 2004; Online April 07, 2005
Copyright © 2005 by ASME
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Surface profile and probability density function of a surface to show the number of points in the idealized model
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Linear transformation of any normal variable into the standard normal variable
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Computational domain of multilayered films in the finite bearing and simplified velocity profile in the lubrication film considering two core zones and one shear zone
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Probability density surfaces for contact or adjacent contact surfaces
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Bearing pressure and temperature history given varying speed (R=36×10−3 m,C=100×10−6 m,ε=0.9, and T0=40°C)
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Effect of roughness on the maximum pressure for different L/D ratio factor. Curves for R=36×10−3 m,C=100×10−6 m,ε=0.9,T0=40°C, and N=1000 rpm are obtained from the multilayer analysis for an isotropic-oriented surface.
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Effect of surface roughness on the maximum temperature given varying L/D ratios (R=36×10−3 m,C=100×10−6 m,ε=0.9,T0=40°C, and N=1000 rpm)
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(a) Journal bearing pressure speed characteristics; (b) Pressure distribution for various surface roughness parameters along the centerline of the journal bearing in the direction of sliding motion
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Dimensionless temperature distribution at the midplane in the sliding direction (R=36×10−3 m,L=21×10−3 m,C=100×10−6 m,ε=0.9, and T0=40°C). (a) N=1000 rpm; (b) N=2000 rpm.
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Journal system temperature-speed characteristics with varying roughness parameters, ( Cases 1, 2: N=500–2000 rpm,R=36,50×10−3 m,L=21,80×10−3 m,C=0.1,0.145×10−3 m,ε=0.9, 0.72 and T0=40°C; Case 3 [Ferron]: N=2000 rpm,R=50×10−3 m,L=80×10−3 m,C=0.145×10−3 m,ε=0.72; Cases 4, 5 [Fillon]: N=1000, 2000 rpm, R=49.986×10−3 m,L=70×10−3 m,C=0.50,0.79×10−3 m; and Case 6 [Ramesh]: N=2000 rpm,C/σ=2,ε=0.8).
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Average contact pressure given various surface roughness parameters along the centerline in the narrow zone of the journal bearing (R=36×10−3 m,L=21×10−3 m,C=100×10−6 m,ε=0.9,T0=40°C, and N=1000 rpm). Average contact pressure: pc=f(d,σ,F3/2).




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