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1
Content available Inertia effects in a multilobe conical bearing lubricated with a couple stress fluid
Walicka A., Walicki E., Jurczak P.
International Journal of Applied Mechanics and Engineering
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2019
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Vol. 24, no. 2
439--451
EN
In this paper, a multilobe conical bearing is analyzed. A lubricant modelled by a couple stress fluid flows In the bearing clearance . The Galerkin method is used to determine the mechanical parameters of multilobe journal bearings. An example of a two-lobe conical bearing is discussed in detail. The inertia of the flowing lubricant is taken into account in the analysis. It has been found that the increase of the couple stress generates an increase the pressure in the clearance.
2
Content available Reynolds number effects in the flow of a Vočadlo electrorheological fluid in a curved gap
Walicka A., Falicki J.
International Journal of Applied Mechanics and Engineering
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2017
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Vol. 22, no. 3
675--695
EN
Many electrorheological fluids (ERFs) as fluids with micro-structure demonstrate a non-Newtonian behaviour. Rheometric measurements indicate that some flows of these fluids may by modelled as the flows of a Vočadlo ER fluid. In this paper, the flow of a Vočadlo fluid – with a fractional index of non-linearity – in a narrow gap between two fixed surfaces of revolution with a common axis of symmetry is considered. The flow is externally pressurized and it is considered with inertia effect. In order to solve this problem the boundary layer equations are used. The Reynolds number effects (the effects of inertia forces) on the pressure distribution are examined by using the method of averaged inertia terms of the momentum equation. Numerical examples of externally pressurized flows in the gap between parallel disks and concentric spherical surfaces are presented.
3
Content available Inertia and couple-stress effects in a curvilinear thrust hydrostatic bearing
Walicka A., Jurczak P., Falicki J.
International Journal of Applied Mechanics and Engineering
|
2017
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Vol. 22, no. 3
759--767
EN
The flow of a couple-stress lubricant in a clearance of a curvilinear thrust hydrostatic bearing with impermeable walls is considered. The flow in the bearing clearance is considered with inertia forces. The equations of motion are solved by an averaged inertia method. As a result, the formulae for pressure distributions without and with inertia effects were obtained. Radial thrust bearings and spherical bearings are discussed as numerical examples. It is shown that inertia effects influence the bearing performance considerably.
4
Content available remote Reynolds number effects in the flow of a Bingham electrorheological fluid between fixed surfaces of revolution
Walicka A., Falicki J.
International Journal of Applied Mechanics and Engineering
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2011
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Vol. 16, no 1
195-210
EN
Many electrorheological fluids (ERFs) as fluids with micro-structure demonstrate viscoplastic behaviours. Rheological measurements indicate that the flows of these fluids may be modelled as the flows of a Bingham fluid. Our concern in the paper is to examine the pressurized laminar flow of an ERF of a Bingham type in a narrow clearance between to fixed surfaces of revolution. In order to solve this problem the boundary layer equations are used. The Reynolds number effects (the effects of inertia forces) on pressure distribution are examined by using the averaged inertia method. Numerical examples of externally pressurized flows in the clearance between parallel disks and concentric spherical surfaces are presented.
5
Content available remote Performance of the curvilinear thrust bearing lubricated by a pseudo-plastic fluid of Rotem-Shinnar
Walicka A., Walicki E.
International Journal of Applied Mechanics and Engineering
|
2010
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Vol. 15, no 3
895-907
EN
In the paper the influence of inertia forces on the pressure distribution and load-carrying capacity of a thrust bearing with curvilinear working surfaces is discussed. The equations of motion of a pseudo-plastic fluid of Rotem-Shinnar, including inertia term of a circumferential flow, are used to derive the modified Reynolds equation. As a result of an analytical solution of the modified Reynolds equation the formulae for the bearing performance are obtained. Step and spherical bearings are considered as examples.
6
Content available remote Inertia effects in a curvilinear thrust hydrostatic bearing with a porous pad
Walicka A., Jurczak P., Walicki E.
International Journal of Applied Mechanics and Engineering
|
2010
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Vol. 15, no 4
1227-1238
EN
The flow of a Newtonian lubricant in a clearance of a curvilinear thrust hydrostatic bearing with one porous wall is considered. The bearing is modelled by two curvilinear smooth surfaces and the porous wall is adhered to the curve non-porous surface. The flow in the bearing clearance is considered with inertia forces and the Navier-Stokes and Poisson equations are uncoupled by using the Morgan-Cameron approximation. The equations of motion are solved by an averaged inertia method. Step and spherical bearings are discussed as examples. It shown that the inertia effects influence the bearing performance considerably.
7
Content available remote Inertia effects in a curvilinear thrust hydrostatic bearing lubricated by a power-law lubricant
Walicka A., Jurczak P., Walicki E.
International Journal of Applied Mechanics and Engineering
|
2010
|
Vol. 15, no 4
1239-1251
EN
The flow of a power-law lubricant in a clearance of a curvilinear thrust hydrostatic bearing with impermeable walls is considered. The bearing is modelled by two curvilinear smooth surfaces. The lubricant flow in the bearing clearance is considered with inertia forces. The equations of motion for power-law fluid (similar to the boundary layer equations) are solved by an averaged inertia method. Step and spherical bearing are discussed as examples. It is shown that the inertia effects influence the bearing performance considerably.
8
Content available remote Inertia effects in a curvilinear thrust hydrostatic bearing
Walicka A., Wojnarowski J.
International Journal of Applied Mechanics and Engineering
|
2010
|
Vol. 15, no 3
909-920
EN
The flow of a Newtonian lubricant in a clearance of a curvilinear thrust hydrostatic bearing with impermeable walls is considered. The flow in the bearing clearance is considered with inertia forces. The equations of motion are solved by an averaged inertia method. A step bearing and a spherical bearing are discussed as examples. It is shown that inertia effects influence the bearing performance considerably.
9
Content available remote Inertia effects in thrust curvilinear hydrostatic bearing lubricated by a Casson fluid
Walicka A., Falicki J.
International Journal of Applied Mechanics and Engineering
|
2008
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Vol. 13, no 2
553-562
EN
Many lubricants demonstrate non-Newtonian behaviours. Rheological measurements indicate that the flows of these lubricants may by modeled as the flows of a Casson fluid. In this paper theoretical aspects of hydrodynamic lubricantion of a curvilinear thrust bearing lubricated by a Casson fluid are considered. The effects of inertia forces on the pressure distribution are examined by using the method of averaged inertia. As examples step and spherical bearings are discussed.
10
Content available remote Inertia effects in a thrust curvilinear hydrostatic bearing lubricated by a Vočadlo fluid
Walicka A., Falicki J.
International Journal of Applied Mechanics and Engineering
|
2008
|
Vol. 13, no 3
817-828
EN
Many lubricants demonstrate non-Newtonian behaviours. Rheological measurements indicate that some flows of these lubricants may by modelled as the flows of a Vočadlo fluid. In this paper theoretical aspects of hydrostatic lubrication of a curvilinear thrust bearing lubricated by a Vočadlo fluid are considered. The bearing is modeled by two surfaces of revolution having a common axis of symmetry.The effects of inertia of a longitudinal flow of the Vočadlo lubricant on the pressure distribution in a bearing clearance are examined by using the method of averaged inertia. As examples step and spherical bearings are discussed.
11
Content available remote Theoretical investigation of gas inertia effects on parameters of a bearing with curvilinear surfaces
Walicka A., Walicki E.
International Journal of Applied Mechanics and Engineering
|
2002
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Vol. 7, no 3
1033-1043
EN
Based on a first-order perturbation solution in a modified Reynolds number an analysis is presented to determine the effect of the inertial forces of an isothermal gas lubricant film on pressure distribution and other parameters of a bearing with curvilinear surfaces. The corrections to the pressure distribution are found to be small, but noticeable. It is also found that these corrections in the case of only rotational inertia forces are significant. Numerical results for thrust bearings with a constant film thickness are given in graphical form.
12
Content available remote Rotational inertia effect in a curvilinear bearing lubricated by generalized second grade fluids of power-law type
Walicki E., Walicka A.
International Journal of Applied Mechanics and Engineering
|
2002
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Vol. 7, no 3
1045-4056
EN
The effects of centrifugal inertia forces on the pressure distribution in a curvilinear thrust bearing lubricated by a generalized second grade fluid of power-law type are examined. The examples of flows in the bearings modelled by two disks and two concentric spheres are considered. The results obtained show that fluid inertia forces have significant effects on the pressure distributions.
13
Content available remote Inertia effect on the pressure distribution in a thrust bearing lubricated by conducting and magnetic viscoelastic fluids
Walicka A.
International Journal of Applied Mechanics and Engineering
|
2002
|
Vol. 7, Spec. is
99-108
EN
A theoretical aspect of lubrication of a curvilinear thrust bearing by conducting and magnetic viscoelastic fluids is considered. The effects of centrifugal (rotational) inertia forces on the pressure distribution in the presence of a magnetic field, normal to the bearing surfaces, are examined. The examples of flows in the bearings modelled by two disks and two concentric spheres are discussed. The obtained results show that the fluid inertia forces and magnetic field have significant effects on the pressure distribution.
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