Abstract
Friction occurs in the processes of transport and storage of granular plant materials used in the energy (RES—Renewable Energy Sources) and food sectors. This paper presents the results of a study on the impact of the moisture content of the material and the number of its contact points with a smooth surface (a steel sheet) on the process of friction in grains of wheat and buckwheat. The friction process was studied for four different levels of moisture (9.5%, 13.5%, 17.5% and 21.5%) and three different average numbers of contact points. To measure the force of friction, an universal testing machine with appropriate instrumentation was used. To determine the number of contact points, computer imaging analysis was conducted. An increase in static and kinetic friction was observed along with the increase in moisture level and the increase in the number of contact points. Correlation and regression analysis was performed for the data obtained.
Highlights
Friction is a complex of physical phenomena which occurs in cases of contact between two bodies
An analysis of the literature conducted by ducted by the of did this not paper did information not reveal information on studies which take into the authors of authors this paper reveal on studies which take into account the number the of contact points of thepoints granular material withmaterial the construction as a factor account number of contact of the granular with the surface construction surinfluencing theinfluencing value of thethe force of friction
Two plant while in friction concontact with a steel plate. Based on both statistical analysis and the surface analysis tact with a steel plate
Summary
Friction is a complex of physical phenomena which occurs in cases of contact between two bodies. It causes grinding of surface asperities, and in order to overcome it, energy must be exerted [1]. For a more precise understanding of this process it is necessary to analyze additional factors For this reason, over the years there have been numerous theories of friction, which can be in the most general terms divided into three groups: mechanical theories, molecular theories, and mechanical-molecular theories. The mechanical theories assume that friction results from the mechanical action of surfaces rubbing against one another This group of theories includes the Amonton-Coulomb theory and Euler’s theory
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