An Overview on Theoretical Analysis of Hydrodynamic Journal Bearing Considering Thermal Effects

Shubham Rajendra Suryawanshi, Jayant T. Pattiwar

Abstract


Hydrodynamic journal bearings are generally used to support the rotating shafts with the application of sliding motion. It sustains the radial as well as axial load in their respective directions. Whenever it runs at high operating conditions, temperature, which effects on lubricant viscosity plays a vital role as it varies due to the bearing surface. The main objective of this paper is to analyse the performance of the plain circular and non-circular journal bearings by using design parameters. An alternative approach to thermo-hydrodynamic analysis is presented assuming that all the heat that is generated by viscous shear in the fluid film is dissipated only in the fluid (no heat conduction through the boundaries). The effect of lubricant viscosity on the parameters such as eccentricity, Sommerfeld number, load carrying capacity, pressure distribution, frictional force, coefficient of friction, power loss and temperature distribution is presented. The analysis is done for a wide range of load, speed, lubricant viscosity. The results obtained theoretically can be validated by experimental methodology as mentioned in this paper. The setup prepared can be used for all types of bearings with different geometries. The analysis is carried out for various grades of a lubricant in which an effect of lubricant viscosity on the bearing temperature is identified. Comparative study is done by taking these lubricants. The study of geometry is also presented as it plays a vital role to overcome the thermal effects as well as instability.

Keywords: hydrodynamic journal bearing, thermal effect, whirl instability, lubricant temperature

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References


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