... 04 10 2011 discs (structures) hydrodynamics laminar flow lubrication non-Newtonian flow Figure 2 shows the gapwidth as a sum of a function of time alone and the other a function of the radial co-ordinate. In this case, h 1 ( t ) denotes the volumetric mean gapwidth between...

... that in the circumferential direction remained. Therefore, the cross-section of the aperture for the leakage flow in the circumferential direction was evaluated from the measured real contact area, and the leakage rates were estimated by assumption of laminar flow. The results agreed well with the measured leakage rates...

... without incurring incoming recirculating flow. The wall profile shape controlling the velocity profile can be optimized for many hydrodynamic contacts. 02 02 2007 19 09 2007 07 04 2008 computational fluid dynamics hydrodynamics laminar flow machine bearings surface texture...

... to a dimensionless tilt value of about 0.6. A second set of curves presents the results obtained for a rotation speed set at 0, corresponding to a laminar flow. In accordance with a previous study ( 16 ), the equilibrium position is reached at a higher seal clearance when the flow is laminar and the faces aligned...

... surface elements into account. Topographic data on representative surface structures are obtained with high spatial resolution with the application of an optical interference technique. The three-dimensional velocity field past these surfaces is computed for laminar flow of Newtonian fluids...

..., Laminar-Flow Annular Seals ,” ASME J. Tribol. 0742-4787 10.1115/1.2164468 , 128 , pp. 378 – 387 . Semanate , J. , and San Andrés , L. , 1993 , “ Analysis of Multi-Land High Pressure Oil Seals ,” STLE Tribol. Trans. 1040-2004 , 36 ( 4 ), pp. 661 – 669 . Patankar , S...

... laminar flow sealing materials mechanical seal flow field CFD K−ε turbulence model fractional approach method The most practical and common method for preventing process fluid (sometimes hazardous) from leaking out of the pump into the surroundings is to isolate the rotating shaft...

...Dara W. Childs; Luis E. Rodriguez; Vito Cullotta; Adnan Al-Ghasem; Matthew Graviss Test results are presented for laminar-flow seals that are representative of buffered-flow oil seals in centrifugal compressors. The seals are short ( L ∕ D ≅ 0.21 ) , with a diameter of 117 mm and a clearance...

... reduction effect of different surface roughnesses is also given. It should be noted that all the calculations are under the condition of laminar flow. The geometry models of the surface with grooves are shown schematically in Fig. 1 . The dimension unit is millimeters. The upper surface is smooth...

.... Associate Editor: L. San Andre´s. 08 January 2002 22 October 2002 19 06 2003 film flow compressible flow flow simulation laminar flow lubrication mechanical contact machine bearings compressibility viscosity In hydrodynamic (or aerodynamic) lubrication theory...

... the slider and disk surfaces, and contaminating the slider surfaces. machine bearings disc drives hard discs confined flow two-phase flow laminar flow surface contamination adhesion impact (mechanical) 26 February 2002 06 August 2006 19 03 2003 Contributed...

.... Associate Editor: M. M. Khonsari. 27 October 2002 20 January 2002 11 July 2002 19 03 2003 channel flow laminar flow shear flow flow simulation rough surfaces surface topography liquid films lubrication The basic lubrication problem is creating a separating force...

... 03 2003 pressure machine bearings Navier-Stokes equations turbulence laminar flow mechanical engineering The problem of the pressure pattern in a hybrid journal bearing recess is not new nor yet completely answered, but every theoretical approach of hybrid journal bearings must...

... 2002 24 09 2002 film flow confined flow laminar flow nonequilibrium flow flow simulation viscosity force lubrication H r , t = film thickness at radius r , at time t H t =  ∂ H / ∂ t H r =  ∂ H...

.... Associate Editor: A. A. Lubrecht. 23 February 2000 26 September 2000 grinding lubrication turbulence laminar flow friction hydrodynamics Proper application of grinding fluid is an important and often critical aspect of many grinding processes. In creep feed grinding...

... contact tribology lubrication Couette flow laminar flow rough surfaces heat transfer thermodynamics 14 Feb 2000 06 July 2000 Contributed by the Tribology Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for presentation at the STLE/ASME Tribology Conference, Seattle...

... December 1999 laminar flow lubrication tribology non-Newtonian fluids viscosity fluid dynamics rheology numerical analysis The pressure generation in the fluid film between two surfaces approaching each other referred to as the squeeze film phenomena plays an important role in many...

... hydrodynamics fluid dynamics Navier-Stokes equations viscosity surface waves (fluid) flow instability boundary layers laminar flow machine bearings The basic assumptions in the classical hydrodynamic theory include negligible fluid inertia forces in comparison to the viscous forces. Pinkus...