Abstract
AbstractThis paper investigates the effect of surface texturing in a partial pad journal bearing through a series of controlled experiments at operating conditions, promoting mixed or boundary regimes of lubrication. Improvements to load carrying capacity are observed under certain operating conditions. A comprehensive computational finite volume multiphase fluid dynamics analysis, including vapour transport equation and modified finite‐size cavity Rayleigh‐Plesset model, is used to study the effect of indented surface textures in the microscale contact domain and within the individual textures themselves. The results show improved conditions with a textured journal through promotion of micro‐hydrodynamic effect, delaying the effect of lubricant rupture, thus extending the effective load bearing region. A very good agreement is obtained between measurements and predictions.
Highlights
Dimples or other shallow cavities have been used to act as reservoirs of lubricant in instances that lead to adverse operating conditions
Some degree of success has been reported in various studies in palliation of friction and improvements to the output power[2,3,4,5] the underlying micro‐ hydrodynamic mechanism, causing pressure perturbations and enhanced lubricant film thickness, has been demonstrated by a number of detailed analytical and numerical analyses.[6,7,8]
The same effects have been noted for other tribological applications, in the case of seals and thrust bearings, where the initial surface texturing work was conceived.[9,10,11]
Summary
Surface texturing is progressively used as an approach to improve load carrying capacity of various tribological conjunctions, as well as mitigating frictional losses.[1,2] Dimples or other shallow cavities have been used to act as reservoirs of lubricant in instances that lead to adverse operating conditions (eg, high load, low sliding speed, or poor lubricant availability). Such conditions inhibit the formation of a coherent film of lubricant, for example, during piston reversals. Some degree of success has been reported in various studies in palliation of friction and improvements to the output power[2,3,4,5] the underlying micro‐ hydrodynamic mechanism, causing pressure perturbations and enhanced lubricant film thickness, has been demonstrated by a number of detailed analytical and numerical analyses.[6,7,8] The same effects have been noted for other tribological applications, in the case of seals and thrust bearings, where the initial surface texturing work was conceived.[9,10,11]
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