Use of the magnetic test-filter for magnetic control of ferroimpurities of fuels, oils, and other liquids (phenomenological and physical models)

It is noted that in most cases, mechanical impurities of technological liquides are ferroimpurities, possessing ferromagnetic properties; therefore for their control (as well as for the decision taking on the possible use of magnetophoresis devices for their removal) the preference should be given to magnetic methods. In the development of the existing options of magnetic control, used in metrology of ferroimpurities control (including ferrography), the main provisions of the relatively new, tested on a number of process liquids (including fuels and lubricants) poly-operational experimental calculation method is set out. Unlike already practiced experimental methods, it allows the implementation of more objective control. Operational data of magnetic control of ferroimpurities in motor oils, gasoline, diesel fuel and others are given. Based on the phenomenological approach (using the method of functional legalization of mass-operational charachteristics in semi-logarithmic coordinates) the expressions for calculating the operating masses (including the forecasted ones outside of the experiment), and, most importantly, for the calculation of the total mass for unlimited and limited number of operations are obtained. Along that expressions (with the relevant data) for determination of the error control during the limitation of the number of operations and inverse expression for the required number of operations subject to the margin of error are receieved. Based on the physical approach (assuming concepts of absorption screen of exponential type) the design formulas correlated with the phenomenological ones for calculating operating mass and the total mass of ferroimpurities (including the residual) in the analyzed sample probe are obtained. The physical meaning of the number of parameters, which were previously considered exclusively empirical, is figured out. - Highlights: • The method of magnetic sedimentation of wear particle has been examined • The main errors of a basic method of single sedimentation by ferrography are shown • The new analytical method of magnetic control for the specified ferrography is offered