Failure-free operation belongs to basic requirements of machineries. Particle occurrence in hydraulic systems belongs to negative effects at operation of hydraulic systems. It is necessary to eliminate the occurrence of these particles into fair level (e. g. by application of filter equipments). Hence it is necessary to set these particles in motion at liquid flow. The aim of the paper is a mathematical simulation of motion of metal particles at oil flow in pipe. The simulation was performed by the computer program ANSYS Fluent12.1.4 at different edge conditions.
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