Abstract
Alkaline additives incorporated in lubricant formulations are gradually exhausted as a diesel engine operates through neutralization of the acidic products of combustion. This results in a drop in the total base number (TBN) value of the oil. Here a glassware laboratory test rig is proposed with a view to reproduce the kinetics of the neutralization reaction involved in TBN depletion. Mathematical concepts of non-dimensional parameters based on the fractional-life period are applied to establish the similarity of the kinetics of TBN depletion for actual and laboratory test rig data. A simulation model in terms of non-dimensional parameters in TBN (α) and time (γ) is proposed. A high correlation coefficient ( r = −0.9403) and successful chi-square test verify the validity of the model. The use of the laboratory test rig and the simulation model for predicting actual service TBN values is also demonstrated.
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