The flow behavior of raw Jojoba oil in comparison with some traditional lube oils

To evaluate the possibility of utilizing the raw Jojoba oils for lubricating purposes in internal combustion engines, the flow behavior of raw Jojoba oil was investigated experimentally. Three customary lube oils of Diesel-, Petrol-, and Motorcycle-engines were employed in comparison with the raw Jojoba oil. Rheometer type of Fann Model of 50SL with coaxial cylinders device was used for this investigation. This investigation reveals that the shear stress of the raw Jojoba oil increases gradually with shear rate in the range of 10–500 s⁻¹ in a linear relationship. At constant shear rate, the shear stresses of the raw Jojoba oil decrease steadily with temperature range of 30−90 C°. The well-known Herschel-Bulkley model can be used to describe sufficiently the flow behavior of the raw Jojoba oil measurement data. The raw Jojoba oil shows flow behavior index equals almost one with slight apparent yield stress. The apparent flow viscosity of the raw Jojoba oil can be analyzed by Arrhenius relationship to show the effect of the applied temperature. At higher operating temperature of 90 °C the raw Jojoba oil exhibits better performance and show higher viscosity values than all the examined lube oils within the range of 10–100 s⁻¹ with viscosity index of 233 which is much higher than the commercial examined oils (range 130–140).