EFFECT OF ADDITIVES OF LUBRICATING OILS ON FLOW ACTIVATION ENERGY

           The dynamic viscosity of lubricating oils, are measured over a temperature range of 298-353 K with and without the additives. The four types of additives were used, Paranox 5263, Paranox 2281, olefin copolymer (OCP)and Polyisoprene 1502.The flow activation energy of lubricating oils is calculated by using the viscosity measurement data.This investigation studies the effect of the temperature changes and the concentration (weight percent of additives) on the flow activation energy of different types of mixtures, such as binary mixture and multi – component mixtures.A method is based upon API gravity of oil, weight percent of additives and API gravity at ١٥٫٦0C of additives is developed to predict the flow activation energy of lubricating oils as follows:Ea = A1 + A2 * (WT %) + A3 * (APIoil) A4Where:
A1, A2, A3 and A4 are constant.Ea= activation energy.The proposed correlations have been found to fit all experimental data consisting of 294 measurements, with an overall average absolute deviation error 5.92 %