ABSTRACT
The present work discusses the effect of magnetic field on the performance of vegetables oils dispersed by polymeric particles. Experiments were carried out using castor, olive, corn, almonds, jasmine and camomile. Fine particles of polyethylene (PE) and polyamide (PA) were dispersed into the oils. Magnetic field was applied by a coil assembled above the pin holder of 0.2 flux intensity.
It was observed that,for sliding of steel pin against oil lubricated brass disc, magnetic field decreased friction coefficient for all the tested oils. Castor and almonds oils displayed the lowest friction coefficient followed by corn, jasmine, olive and camomile oils. Dispersing oil by polyethylene (PE) particles significantly increased friction coefficient. Camomile oil showed the highest friction coefficient in the presence of magnetic filed. A drastic reduction of friction coefficient was observed for olive, castor and almonds oils, when dispersing the tested oils by polyamide (PA) particles. Corn, jasmine and camomile oils displayed relatively higher friction coefficient. Sliding of steel pin on oil lubricated aluminium disc caused significant friction increase for all the tested oils. The friction increase could be attributed to the nature of the friction of aluminium against steel surface. Drastic friction reduction was observed for castor, almonds, jasmine and camomile oils when dispersed by PE particles. Dispersing vegetables oils by PA particles showed relatively lower friction coefficient for olive and castor oils, while corn almonds, camomile and jasmine oils showed relatively higher friction values. Sliding of steel pin on oil lubricated steel disc showed the highest values of friction coefficient. Dispersing the tested oils by PE particles did not decrease friction coefficient. Jasmine oil displayed relatively lower friction than the other tested oils. No enhancement was observed for dispersing the tested oil by PA particles. Generally, olive oil displayed the lowest friction coefficient. Besides, magnetic field showed relatively lower friction in spite of the extra normal force exerted by the magnetic field.