Title : Rheological behavior of olive oil used as biodegradable lubricant
Abstract:
The main objective of a lubricant is to reduce frection an wear. But also, it is responsible for heat evacuation. Taking into account their nature, there are mineral, synthetical, vegetal or animal lubricants. Untill the XIX-th century, the manufacturing process of lubricants has been based on vegetal and animal recources. In southern country, the olive and corn poppyoils were used meanwhile in northern country the rapeseed oil was used. These oils have a high degree of biodegradability even today. But when the mankind has discovered that oil could be processed for having lubricants and fuels at acceptable costs, the importance of vegetal resources had been reduced, but these petroleum-based lubricants has a strogly negative impact on the environment.
This proposes three relationships of dynamic viscosity temperature dependence for olive oil. The purpose of this study was to find a polynomial or exponential dependence between temperature and dynamic viscosity of olive oil, using the Andrade equation changes. Equation constants A, B, C and D were determined by fitting polynomial or exponential. Thousands of years, this oil was used for cooking, cosmetics and soap, but also as fuel for lamps.
This proposes the relationship to describe the dependence of the dynamic viscosity of a olive oil, on the temperature. Experimental data for one type of olive oil were used to calculate the accuracy the proposed models. Equation constants were determined by exponential or polynomial beast curves obtained at different shear rates using the program Origin 6.0. The correlation coefficients thus obtained varied between 0.8754 and 0.9999.
