Premium
Fully Coupled Thermo‐Hydrodynamic Simulation Model for Journal Bearings
Author(s) -
Esmaeili L.,
Schweizer B.
Publication year - 2010
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201010175
Subject(s) - reynolds equation , mechanics , bearing (navigation) , isothermal process , fluid dynamics , heat transfer , partial differential equation , discretization , finite element method , flow (mathematics) , reynolds number , viscosity , thermodynamics , nonlinear system , materials science , physics , mathematics , mathematical analysis , turbulence , quantum mechanics , astronomy
The isothermal form of Reynolds fluid film equation is used to predict the pressure generation in hydrodynamic journal bearings if temperature effects are neglected. Often, however, temperature effects may be important and cannot be neglected, because oil viscosity significantly varies with temperature. Also, thermal expansion of journal shaft and bearing housing must be taken into account since the bearing clearance changes with increasing temperature. Hence, the Reynolds pressure field equation, the energy equation for the fluid film and the heat transfer equations for journal and bearing housing have to be solved simultaneously. The coupled thermo‐hydrodynamic fluid flow problem is mathematically defined by a system of nonlinear integro‐differential equations. The governing equations are discretized and solved by a finite element approach. (© 2010 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)