Viscosity measurement of biodiesel at high pressure with a falling sinker viscometer

J. M. Paton, C. J. Schaschke*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

In this work, we report the measurement of the viscosity of biodiesels derived from waste cooking oil and vegetable oil under high pressure. Using a falling sinker-type viscometer, dynamic viscosity measurements were made at pressures up to 140 MPa which are typically to be found in common-rail automotive diesel engines. Reproducible and reliable viscosity data were obtained from sinker fall times and calibration data. The biodiesel viscosities were compared to that of petrochemical diesel fuels also under high pressure. Both fuel types were found to increase exponentially with pressure with the biodiesels being slightly the more viscous. Above 140 MPa, a marked increase in sinker fall time was observed. This was due to a pressure-freezing effect which is known to also occur with longer chain molecules found in petrochemical diesel, oils, fatty acids and biodiesel.

Original languageEnglish
Pages (from-to)1520-1526
Number of pages7
JournalChemical Engineering Research and Design
Volume87
Issue number11
Early online date26 May 2009
DOIs
Publication statusPublished - Nov 2009

Keywords

  • falling sinker viscometer
  • high-pressure
  • biodiesel
  • viscosity
  • biofuel

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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