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1
Content available remote Inertia and surface roughness effects in a curvilinear squeeze film bearing lubricated by a power-law fluid
100%
Walicka A.
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tom Vol. 14, no 4
1139-1161
EN
The flow of a power-law lubricant in a squeeze film bearing is considered. The bearing is modelled by two curvilinear rough surfaces. The flow in the bearing clearance is considered with inertia effects. Using the Christensen stochastic model of a surface roughness a closed-form solution is obtained. A step bearing and a spherical bearing are discussed as examples. It is shown that the power-law exponent and the roughness considerably influence the bearing performance.
2
Content available remote Inertia effects in a curvilinear thrust hydrostatic bearing with a porous pad
100%
Walicka A. , Jurczak P. , Walicki E.
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tom 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.
3
Content available remote Inertia effects in a curvilinear thrust hydrostatic bearing lubricated by a power-law lubricant
100%
Walicka A. , Jurczak P. , Walicki E.
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tom 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.
4
Content available remote Pressure distribution in a squeeze film biobearing lubricated by a synovial fluid
100%
Jurczak P.
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tom Vol. 11, no 4
857-864
EN
The flow of a synovial fluid in a squeeze film biological bearing is considered. The biobearing is modelled by two rotational surfaces and the porous layer is adheres to the curved non-porous surface. The flow in the biobearing clearance is considered with inertia and the Navier-Stokes and Poisson equations are uncoupled by using the Morgan-Cameron approximation. As an example the biobearing modelled by two disks and two spherical surfaces is discussed.
5
Content available remote Influence of rheological parameters on the mechanical parameters of curvilinear thrust bearing with one porous wall lubricated by a couple stress fluid
100%
Jurczak P. , Walicka A. , Walicki E. , Michalski D.
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tom Vol. 11, no 2
221-233
EN
The flow of a couple stress fluid in the clearance of a curvilinear thrust bearing with a porous pad is considered. The porous pad is connected with an upper impermeable rotating surface which approaches the lower fixed bearing surface. The Reynolds and Poisson equations are uncoupled by using the Morgan-Cameron approximation and a closed-form solution is obtained. Expressions for the pressure and capacity load of the bearing are given. As an example the bearing modelled by two disks and two spherical surfaces is discussed.
6
Content available remote Theoretical investigation of gas inertia effects on parameters of a bearing with curvilinear surfaces
100%
Walicka A. , Walicki E.
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tom 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.
7
Content available remote Rotational inertia effect in a curvilinear bearing lubricated by generalized second grade fluids of power-law type
100%
Walicki E. , Walicka A.
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tom 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.
8
Content available remote Flow of a couple-stress fluid in a curvilinear thrust bearing with one porous pad
84%
Jurczak P. , Walicka A. , Walicki E. , Michalski D.
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tom nr 3
63-75
EN
The flow of a couple stress fluid in the clearance of a curvilinear bearing with a porous pad is considered. The porous pad is connected with the upper impermeable rotating surface which approaches the lower fixed bearing surface. The Reynolds and Poisson equations are uncoupled by using the Morgan-Cameron approximation and a closed-form solution is obtained. As an example the bearing formed by two disks is discussed.
PL
W pracy rozważono przepływ płynu z naprężeniami momentowymi w krzywoliniowej szczelinie łożyska z porowatą wkładką. Porowata wkładka powiązana jest z górną nieprzepuszczalną wirującą powierzchnią, która zbliża się do dolnej nieruchomej powierzchni łożyska. Do rozwiązania równań Poissona oraz Reynoldsa wykorzystano przybliżenie Morgana-Camerona. Jako przykład rozpatrzono łożysko utworzone przez dwie kołowe tarcze.
9
Content available remote Inertia effects in a curvilinear squeeze film bearing with one porous wall lubricated by a power-law fluid
84%
Walicka A. , Walicki E. , Jurczak P. , Michalski D.
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2003
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tom Vol. 8, no 1
107-116
EN
The flow of a power-law lubricant in a squeeze film bearing with one porous wall is considered. The bearing is modelled by two curvilinear surfaces and the porous wall is adhered to the curved non-porous surface. The flow in the bearing clearance is considered with inertia and the Navier-Stokes and Poisson equations are uncoupled by using the Morgan-Cameron approximation. Using the averaged inertia method the closed-form solution is obtained. A step bearing is discussed as an example.
10
Content available remote Effect of fluid inertia and wall porosity on parameters of a biobearing with squeeze film.
84%
Walicka A. , Walicki E. , Jurczak P.
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tom Vol. 37, nr 3
145-155
EN
The flow of a Newtonian fluid in squeeze film of a biological bearing with one porous wall is considered. The bearing is modelled by two curvilinear surfaces and the porous wall is adhered to the curved non-porous surface. The flow in the bearing clearance is considered with inertia and the Navier-Stokes and Poisson equations are uncoupled by using the Morgan-Cameron approximation. Using the averaged inertia method the closed-form solution is obtained. Step and spherical bearings are discussed as examples.
PL
Rozważano przepływ cieczy newtonowskiej w ściskanym filmie biologicznego łożyska z jedną porowatą ścianką. Łożysko jest modelowane przez dwie krzywoliniowe powierzchnie. Porowata ścianka przylega do krzywoliniowej nieporowatej powierzchni. Rozważony jest przepływ cieczy w przestrzeni łożyska z uwzględnieniem bezwładności. Równania Naviera-Stokesa i Poissona są rozwiązane z zastosowaniem przybliżenia Morgana-Camerona. Z wykorzystaniem metody uśredniania bezwładności zostało uzyskane rozwiązanie w formie zamkniętej. Przykładowo zostały rozpatrzone łożyska stopowe i sferyczne.
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