... . In Sec. 3 , the solution of the tangential problem is used to update the rolling profiles and enables to follow the wear evolution versus time. The method used to solve the normal problem is called semi-Hertzian approach with diffusion. It allows fast determination of the contact area for non-Hertzian...

... of a Couette flow. Using this description, two time scales are identified that govern the journal bearing dynamic behavior: the viscous diffusion time and the axial flow-through time. Based on this, a reduced frequency parameter is introduced that determines the development of the flow field in the journal...

...-ellipsometer. The apparent diffusion coefficients of novel lubricants were also studied in order to evaluate the spreading speed and they were compared with the conventional Zdol. It was found that the mobility of cyclotriphosphazine-terminated PFPE films is lower than that of Zdol. This characteristics...

... pressure almost to the ultimate pressure of a vacuum pump, providing there is no leak or outgassing from materials. vacuum pumps diffusion 1 The first experiment measured the vacuum chamber pressure when the rotational shaft was not installed in the vacuum chamber. A flat plate with an O-ring...

...Sinan Mu¨ftu¨; M. Cengiz Altan A model for analyzing the interfacial conditions of a porous web moving over a cylindrical rigid guide is presented. This problem is different from the classical foil bearing problem due to the fact that the air can diffuse through the porous web itself...