Investigation of the rheological properties of waste and pure lube oils

Mamdouh T. Ghannam, Mohamed Y.E. Selim, Mona A.M. Khedr, Noor A.G. Bin Taleb, Norah R. Kaalan

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


In this study, the rheological characteristics of the waste and pure lube oils were investigated experimentally. Studying these characteristics are useful for understanding the behavior of lubricants and the recycling of waste lube oils. The Fann Model of 50SL rheometer with coaxial cylinders was employed for this investigation. Four different types of waste and pure lube oils were examined, namely: diesel-, petrol-, motorcycle-, and jet-engine oils. The results from the study show that the viscosities of all types of lube oils decrease gradually with temperature and shear rate due to the reduction of the intermolecular forces, which leads to a decline in the flow resistance. At a specific shear rate of 100 s−1 and heating the oils from 50 °C to 90 °C, the viscosity drops almost 60% for pure & waste diesel lube oils, 60–64% for pure & waste petrol lube oils, 48–50% for pure & waste motor-cycle lube oils, and 50–60% for pure & waste jet lube oils, respectively. The well-known Arrhenius relationship was also utilized in studying the temperature effect of the apparent viscosity.

Original languageEnglish
Article number120774
Publication statusPublished - Aug 15 2021


  • Diesel lube
  • Jet lube
  • Motorcycle lube
  • Petrol lube
  • Pure and WLOs
  • Shear rate
  • Shear stress
  • Viscosity

ASJC Scopus subject areas

  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry


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