The Relationship of Thermal Energy and Viscosity of Used Vegetable Oil and Diesel Oil Mixture

Abstract

Used vegetable oil has been taken into accounted to use as raw material for producing of bio-diesel. The research is to investigate the thermal energy content and coefficient of viscosity of used vegetable oil mixed with diesel oil at mixed ratio of 02:98, 05:95, 10:90, 15:85, 18:82, 20:80 and 50:50 % by volume. The results have shown that the oil blended ratio at 18:82% by volume have maximum of net heating value (NHV) is 5.14×104 kJ/kg. The NHV is increasing with oil blended ratio increased to the oil blended ratio of 18:82% by volume, after that is decreased with increasing the mixed ratio. Whilst, the coefficient of viscosity of blended oil at mixed ratio of 18:82 % by volume is minimum, is 2.39×10-1 N.s/m2. The coefficient of viscosity is increasing with the mixed oil ratio increased. Finally, to consider the relationship between the NHV and coefficient of viscosity of mixed oil, shown that the NHV is polynomial function with the coefficient of viscosity. The coefficient of viscosity is increasing, NHV are decreased.