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Abstract: Interferometric experiments are carried out to study the profile of an elastohydrodynamic lubricating film, which is generated by polybutene lubricants of high viscosities under pure sliding at ultra-slow speeds, and an obvious inlet dimple is observed. The experimental results demonstrate that the depth of the dimple increases with increasing loads, and increases with entrainment speeds until a maximum is reached. Moreover, in the experiments it is easier to generate the inlet dimple when lubricants of higher viscosity are used. Under conditions of pure sliding, the dependence of film thickness on loads and speeds deviates largely from the classical theory. The present experiments provides a validation of previous numerical elastohydrodynamic lubrication analysis with inlet dimples.
Key words: Elastohydrodynamic lubrication Limiting shear stress Wall slippage Inlet dimple
CLC No:
TH117
国家自然科学基金(50475165)、山东省自然科学基金(Y2004F19)和青岛市科技发展基金(04-2-JZ-112)资助项目. Received 20061122, received in revised form 20070721
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