The purpose of this article is to determine the effect of the concentration of magnetic particles in ferro-oil on the
value of its magnetic susceptibility coefficient χ.
Determination of the flow and operating parameters of slide journal bearings lubricated with ferro-oils requires,
inter alia, designation the first magnetization N and the magnetic induction B vector components, dependent on the
magnetic propertis of the lubricant. The fundamental problem lies in the inability to make direct accurate measurement of magnetic induction in
the lubricating gap of slide bearing and its solution is to determine it on the analytical and numerical way. A key issue
for the accuracy of such solutions is to obtain reasonably accurate values of magnetic susceptibility χ. This article
attempts to determine these values and estimate their relationship with the concentration of magnetic particles
concentration in ferro-oil being potential lubricant above-mentioned bearings.
In this paper, the authors present the characteristic of experimental test benches to determine the coefficients of
the magnetic susceptibility. They present method of determining this value from obtained measurement data and
analyse the impact of the magnetic particles concentration in ferro-oil on its magnetic susceptibility values.
Tests were performed for selected concentrations of magnetic particles in ferro-oil ranging: 2%, 4%, 6% and 8%
and the tested ferro-oil was product from Unterensingen FerroTec Company (Germany) which is a mixture of
colloidal mineral engine oil LongLife Gold Penzzoil class SAE 15W-40 with addition of Fe3O4 magnetic particles and
a surfactant.
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