0
TECHNICAL PAPERS

Flow and Stress Induced Cavitation in a Journal Bearing With Axial Throughput

[+] Author and Article Information
A. Pereira, D. D. Joseph

University of Minnesota, Minneapolis, MN 55454

G. McGrath

PDVSA Intevep S. A., Venezuela

J. Tribol 123(4), 742-754 (Jan 22, 2001) (13 pages) doi:10.1115/1.1387026 History: Received February 24, 2000; Revised January 22, 2001
Copyright © 2001 by ASME
Your Session has timed out. Please sign back in to continue.

References

Joseph, D. D., McGrath, G., Nuñez, G., and Ortega, P., 1999, “Apparatus and Method for Determining Dynamic Stability of Emulsions,” US patent 5, 987, 969, Nov 23; 1999.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, Hemisphere, New York, pp. 26, 30, 35, 118, 120, 147.
Joseph,  D. D., 1998, “Cavitation and the State of Stress in a Flowing Liquid,” J. Fluid Mech., 366, pp. 367–378.
Wannier,  G., 1950, “A Contribution to the Hydrodynamics of Lubrication,” Q. Appl. Math., 8, pp. 1–32.
Szeri,  A. Z., Al-Sharif,  A., 1995, “Flow Between Finite, Steadily Rotating Eccentric Cylinders,” Theor. Comput. Fluid Dyn., 7, pp. 12.

Figures

Grahic Jump Location
Diagram of the emulsion quality meter (EQM, patent 5,987,969 Nov 23, 1999 Joseph et al. 2). A highly concentrated oil in water emulsion is forced under pressure from the inlet to the outlet as the rotor turns at a rapid rate. The residence time is controlled by the pressure between the ports and the emulsion is milled as it passes through the minimum gap many times. The milling is controlled by the fluid flow. The pressure between the ports is idealized with a constant pressure.
Grahic Jump Location
Grid array. In this figure (L,M)=(14,5). In the computation (L,M)=(128,60).
Grahic Jump Location
Streamlines for Re=160 (A) ẽ=0 (B) ẽ=0.178 (C) ẽ=0.452 (D) ẽ=0.726
Grahic Jump Location
Streamlines at low Reynolds numbers Re=1.8 and different eccentricities (Table 1)
Grahic Jump Location
Streamlines for ẽ=0.452: (A) Re=1.8, (B) Re=18.2, (C) Re=146, (D) Re=292. The points of separation are designated as S.P.; points of re-attachment are designated as R.P.
Grahic Jump Location
Effect of eccentricity on the axial velocity profile at ΩR=1600 cm/s and ΔP:41.4 kPa
Grahic Jump Location
Average pressure distribution in function of angular position: (A) 10 cm/s and (B) 100 cm/s. The average is taken over radial nodes; (C) 800 cm/s, and (D) 1600 cm/s. (See Table 1 and 2 for dimensionless values.)
Grahic Jump Location
Largest/lowest average pressure and its difference vs. rotor speed (eccentricity: 0.265 cm). (See Tables 1 and 2 for dimensionless values.)
Grahic Jump Location
Pressure gradient at different speeds, using an eccentricity of 0.265 cm.
Grahic Jump Location
Effect of eccentricity on stress A: shear stress (τ), B: extensional stress (τθθ),ΩR=1600 cm/s.
Grahic Jump Location
Tangential velocity distribution vs. radial distance in the minimum gap for three different eccentricities, ΩR=1600 cm/s.
Grahic Jump Location
Tangential velocity distribution vs. angular distance (0–90 deg.), at a radial distance of 0.06 cm measured from the rotor’s surface.
Grahic Jump Location
Dynamic pressure average (DP), shear stress average (SS) and extensional stress (ES) average vs. angle for three eccentricities, ΩR=1600 cm/s.
Grahic Jump Location
(A) Torque versus rotor speed for Ωa=10, 100, 800, and 1600 cm/s and eccentricities: 0.265, 0.165, 0.065 and 0cm (concentric); (B) mechanical power as a function of angular velocity and eccentricity.
Grahic Jump Location
Comparison of the pressure distribution by simulation with the lubrication pressure (28) for different speeds when e=0.165 cm
Grahic Jump Location
p and −T11 versus r in the converging flow θ=−35.7deg. and the diverging flow θ=35.7
Grahic Jump Location
Comparison of tensile stresses −p and T11=−p+S11 for Ωa=10 cm/s. Positive values are in the diverging zone with low pressures and high tensile stresses favorable to cavitation.
Grahic Jump Location
Comparison of tensile stresses −p and T11=−p+S11 for Ωa=800 cm/s. Positive values are in the diverging zone with low pressures and high tensile stresses favorable to cavitation.
Grahic Jump Location
Comparison of tensile stresses −p and T11=−p+S11 for Ωa=1600 cm/s. Positive values are in the diverging zone with low pressure and high tensile stresses favorable to cavitation.
Grahic Jump Location
Comparison of −p and T11 for different axial pressure gradients R̃ corresponding to pressure drop Δp:  _pressure,   _T11 for Δp=0, ⋯⋄⋯ T11 for Δp=41.4 kPa, —▴— T11 for Δp=310.2 kPa, and –○– T11 for Δp=655 kPa.
Grahic Jump Location
Shear stress plane defined by ϕ on r=a

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In