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Keywords: convection
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Journal Articles
Article Type: Research Papers
J. Tribol. July 2011, 133(3): 031802.
Published Online: July 25, 2011
...Guy Bayada; Laurent Chupin; Sébastien Martin In this paper, an asymptotic expansion is used to derive a description of Phan–Tien– Tanner (PTT)/Oldroyd-B flows in the thin film situation without the classical “upper convective maxwell”(UCM) assumption. We begin with a short presentation of the Phan...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2011, 133(2): 021703.
Published Online: March 22, 2011
..., uneven oxidation, etc. Most foil bearings with even commercial coatings undergo initial break-in when they are first used. Mild rubbing marks on the bearing and rotor surface are the typical signature marks of the break-in. A bh heat convection area of bearing housing element...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2011, 133(1): 011703.
Published Online: December 21, 2010
... for modeling the thermal aspects of the engagement process in a wet clutch. The thermal model includes full consideration of the viscous heat dissipation in the fluid as well as heat transfer into the separator, the friction material, and the core disk. The convective terms in the energy equations for the oil...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2010, 132(2): 021704.
Published Online: April 14, 2010
.... 28 07 2009 11 01 2010 14 04 2010 14 04 2010 convection foils machine bearings rotors turbomachinery air foil bearing microturbomachinery THD analysis Environment-friendly microturbomachinery, with power ranges less than 1 MW (from definition of the Gas...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2010, 132(1): 011704.
Published Online: December 10, 2009
... ) | z = 0 5 On the outer part of the housing. The free convection and radiation hypothesis give 19 | ( ∂ T b ∂ r ) | r = R 3 = − h a b k b ⋅ ( T b ∣ r = R 3 − T a ) where T mix is the mixing...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2010, 132(1): 011702.
Published Online: November 11, 2009
... thermohydrodynamic model that appropriately takes into account the film rupture and reformation. An extensive set of numerical solutions are presented to closely examine the effects of misalignment in journal bearings. 07 06 2009 14 09 2009 11 11 2009 11 11 2009 cavitation convection...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2010, 132(1): 011701.
Published Online: November 11, 2009
... by conduction and convection to assist in the design and troubleshooting of rotor-GFB systems operating hot. Bearing temperatures and shaft motions measurements are obtained in a test rotor electrically heated to 132 ° C . In speed-up tests to 26 krpm, the rotor motion amplitude drops suddenly just above...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2009, 131(2): 021601.
Published Online: March 6, 2009
..., convective heat transfer, and variable load direction condition in the thermally induced seizure is discussed in light of the numerical results. In this part, the influence of the key parameters such as applied load, contact clearance, friction coefficient, oscillation parameters, convective heat...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2009, 131(2): 021702.
Published Online: March 5, 2009
... convection finite element analysis lubricants machine bearings turbomachinery gas foil bearing thermohydrodynamics Lobatto point quadrature The foil air bearings can be simply described as a kind of compliant self-acting hydrodynamic fluid film bearings by functioning ambient air...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2008, 130(4): 041503.
Published Online: August 5, 2008
... equation used considers the effects of heat conduction and convection, viscous heating, and the heat of evaporation. The developed method has been applied to a series of cases of lubricated metal-on-metal line contact with an entrainment velocity of u ent = 2.5 m ∕ s , viscosities η 0 = [ 0.01 , 1 ] Pa s...
Journal Articles
Article Type: Technical Papers
J. Tribol. October 2007, 129(4): 895–903.
Published Online: June 19, 2007
... bath and the groove between pads are determined through analyses of thermal equilibrium for the bearing and for the groove. 14 06 2006 19 06 2007 convection high-pressure effects liquid films lubricating oils lubrication machine bearings tilting-pad thrust bearing...
Journal Articles
Article Type: Technical Briefs
J. Tribol. July 2007, 129(3): 695–699.
Published Online: January 19, 2007
... convection numerical analysis non-Newtonian lubricants thermohydrodynamic lubrication slider bearing flow channel flow Several theoretical and computational studies have been performed to evaluate the effect of non-Newtonian behavior (modeled as generalized Newtonian fluids (GNF...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2006, 128(3): 534–541.
Published Online: February 16, 2006
... in the present analysis by estimating the Nusselt numbers of the cooling air and deriving the corresponding forced convection heat transfer coefficients, h conv , at the outer surface of the top foil. The following relation was used to evaluate the Nusselt number for this application ( 20 ): 22 Nu...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2006, 128(2): 312–318.
Published Online: September 27, 2005
... the pad is taken into account by solving the Laplace equation with convective boundary conditions that are realistic. The runner’s temperature, assumed constant, is determined by imposing a zero value for the global heat flux balance. The constructed model gives the pressure distribution and velocity...
Journal Articles
Article Type: Technical Papers
J. Tribol. January 2005, 127(1): 70–81.
Published Online: February 7, 2005
... the temperature-viscosity wedge. non-Newtonian flow non-Newtonian fluids numerical analysis lubrication elastodynamics viscosity rheology sliding friction convection stress-strain relations mechanical contact thermal analysis 21 March 2003 05 October 2004 07 02 2005...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2005, 127(4): 750–755.
Published Online: January 27, 2005
... of contacting surfaces. The change in temperature at a contact area may be attributed to the combined effects of frictional heating and convective cooling. This paper presents a transient, three-dimensional solution for the normal surface displacement of an elastic half-space due to an arbitrarily distributed...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2004, 126(4): 719–727.
Published Online: November 9, 2004
... pressures in the squeeze film are obtained from the equation of motion, which includes both local and convective inertia terms, and the continuity equation, using the perturbation method. Experimental data on the squeeze-film pressures and forces are also obtained under the sinusoidal squeezing motion...
Journal Articles
Article Type: Technical Notes
J. Tribol. October 2004, 126(4): 819–822.
Published Online: November 9, 2004
.... Wang (Assoc. Ed.). 19 November 2003 29 April 2004 09 11 2004 machine bearings deformation elastodynamics numerical analysis convection thermal expansion Nowadays, most hydrodynamic journal bearings are required to operate with increasing temperatures...