A Thermo-Elasto-Hydrodynamic Study of Journal Bearing With Controlled Deflection

1993 ◽  
Vol 115 (3) ◽  
pp. 550-556 ◽  
Author(s):  
N. O. Freund ◽  
A. K. Tieu
Keyword(s):  
Thermal Effects ◽  
Journal Bearing ◽  
Load Capacity ◽  
Three Dimensions ◽  
The Finite Element Method ◽  
Temperature Dependent ◽  
Temperature Dependent Viscosity ◽  
Lubricating Film ◽  
Hydrodynamic Study ◽  
Dependent Viscosity

A thermo-elasto-hydrodynamic study of a specially modified journal bearing is included. A numerical simulation is carried out by the finite element method, coupling the deflection of the bearing housing and the pressure derived from the Reynolds equation. In turn, this is coupled through its temperature dependent viscosity terms to the energy equation. Elastic effects are treated in three dimensions. Thermal effects are considered in three dimensions in both the lubricating film and bearing housing with convection specified on the housing boundaries. The bearing is specially modified with an undercut on the bearing housing. It will be demonstrated that by design an appropriate deflection of the undercut can be achieved to improve the load capacity.

A Thermohydrodynamic Analysis of Journal Bearings Lubricated by a Non-Newtonian Fluid

1988 ◽  
Vol 110 (3) ◽  
pp. 414-420 ◽  
Author(s):  
A. Kacou ◽  
K. R. Rajagopal ◽  
A. Z. Szeri
Keyword(s):  
Newtonian Fluid ◽  
Journal Bearing ◽  
Load Capacity ◽  
Journal Bearings ◽  
Temperature Dependent ◽  
Temperature Dependent Viscosity ◽  
Material Parameters ◽  
Differential Type ◽  
Dependent Viscosity ◽  
Newtonian Behavior

Our earlier work on the flow of a non-Newtonian fluid of the differential type in a journal bearing is extended here to include nonisothermal operations and temperature dependent viscosity. We show that for the type of lubricant investigated, even a slight departure from Newtonian behavior renders the bearing performance relatively insensitive to changes in lubricant temperature. But whether this change in lubricant behavior actually results in improved load capacity depends on the value and the sign of the material parameters.

Thermal Effects in Rolling/Sliding Contacts: Part 2—Analysis of Thermal Effects in Fluid Film

1987 ◽  
Vol 109 (3) ◽  
pp. 512-517 ◽  
Author(s):  
Farshid Sadeghi ◽  
Thomas A. Dow
Keyword(s):  
Thermal Effects ◽  
Elastohydrodynamic Lubrication ◽  
Two Dimensional ◽  
Temperature Dependent ◽  
Sliding Contacts ◽  
Temperature Dependent Viscosity ◽  
Pure Rolling ◽  
Dependent Viscosity ◽  
Energy Equations ◽  
Experimental Pressure

A two dimensional numerical solution to the problem of thermal elastohydrodynamic lubrication of rolling/sliding contacts was obtained using a finite difference formulation. The technique involves the simultaneous solution of the thermal Reynolds’ equation, the elasticity equation, and the two dimensional energy equation. A pressure and temperature dependent viscosity for a synthetic paraffinic hydrocarbon lubricant (XRM-109F) was considered in the solution of the Reynolds’ and energy equations. The experimental pressure and surface temperature measurements obtained by Dow and Kannel [1] were used in evaluating the results of the numerical analysis for the cases of pure rolling and slip conditions.

Thermal Effects in Slider Bearings With Limited Corrugation and Power-Law Lubricant

2012 ◽  
Author(s):  
B. P. Huynh
Keyword(s):  
Power Law ◽  
Thermal Effects ◽  
Shear Thickening ◽  
Temperature Dependent ◽  
Temperature Dependent Viscosity ◽  
Slider Bearings ◽  
Influence Of Temperature On ◽  
Computational Fluid Dynamics Cfd ◽  
Dependent Viscosity ◽  
Power Law Index

Influence of temperature on the performance of slider bearings of infinite width but having corrugation of limited extent is investigated numerically, using a commercial Computational Fluid Dynamics (CFD) software package. Lubricant is assumed to be a fluid of power-law type with temperature-dependent viscosity. Over a range of the power-law index, combined effects of temperature and the corrugated section’s location on load-supporting capacity Fy of the bearing’s fluid film are considered. Influence of the bearing-gap surfaces’ thermal boundary condition is also examined. Compared with isothermal situation, thermal effects result in significant reduction in Fy, especially with shear-thickening lubricants. This reduction in Fy is also affected significantly by the corrugated section’s location.

scholarly journals Non-Isothermal Creeping Flows in a Pipeline Network: Existence Results

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1300
Author(s):  
Evgenii S. Baranovskii ◽  
Vyacheslav V. Provotorov ◽  
Mikhail A. Artemov ◽  
Alexey P. Zhabko
Keyword(s):  
Nonlinear Boundary ◽  
Galerkin Approximation ◽  
Large Data ◽  
Temperature Dependent ◽  
Weak Formulation ◽  
Temperature Dependent Viscosity ◽  
Pipeline Network ◽  
Flux Boundary Conditions ◽  
Creeping Flows ◽  
Dependent Viscosity

This paper deals with a 3D mathematical model for the non-isothermal steady-state flow of an incompressible fluid with temperature-dependent viscosity in a pipeline network. Using the pressure and heat flux boundary conditions, as well as the conjugation conditions to satisfy the mass balance in interior junctions of the network, we propose the weak formulation of the nonlinear boundary value problem that arises in the framework of this model. The main result of our work is an existence theorem (in the class of weak solutions) for large data. The proof of this theorem is based on a combination of the Galerkin approximation scheme with one result from the field of topological degrees for odd mappings defined on symmetric domains.

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