The method of calculation for the adsorbed process in the small gaps of a liquid end of high pressure hydraulic actuators

Abstract

In the article it is offered the method of quantitative description of adsorption process on
the surfaces in the small gaps of a liquid end of hydraulic apparatus. It is analyzed the influence
of adsorption on tribological properties of friction couples and the dependence of this process on
high pressure. The authors examined the mechanisms of formation of the adsorption films.
It is showed the ways of measuring by high pressure rotary viscometer of the working fluid parameters which are necessary to calculate the required input values. It is specified the benefits of
using by calculation the linear dimensions of the molecular chains which are solved by the relations of the Van der Waals volumes and the Van der Waals surface areas. It is described the algorithms for the calculation of the impact of highpressure on the values of the Van der Waals volumes, the Van der Waals surface areas and dependent on them parameters. The examples of
the calculation of dependence ofthe surfactant adsorption on working pressure are provided.
It is showed numerical relationship of the thickness of the adsorbed layer on changing of pressure
points. The method of the determination of physical and chemical transformations by values of
the dielectric relaxation time is described. This method allows the pressures points identified by
the rheological effects in the working environments. It is giving the example of the rheological
effect appearing in small gaps by the adsorbed layers. The experiments confirmed the phase and
structural transformations in small gaps of high pressure hydraulic actuators. The experiments
also proved the existence of described rheological effects in the gaps less than 10 micron for hydrocarbon liquids and default of these rheological effects in the volumes of identical hydrocarbon
environments by same pressures points. The obtained results were analyzed.