Diffusion coefficients of diesel fuel and surrogate compounds in supercritical carbon dioxide

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Facilitating a new concept of clean diesel combustion using supercritical fluids requires a better understanding of thermophysical properties of the diesel fuel/diluent system. Mass diffusivity is one such property that is important to understand diesel fuel/diluent mixing and spray and combustion of supercritical fuel mixtures. In this work, diffusion coefficients of diesel fuel and surrogate compounds in supercritical carbon dioxide were experimentally determined by the Taylor dispersion method at temperatures from 313.15 to 373.15 K and pressures up to 30 MPa. Difficulties were encountered to measure diffusion coefficients using the Taylor dispersion method near the critical region of CO2 which resulted in curve-fitting errors greater than 5%. Predictive correlations including Wilke-Chang, Scheibel, and He-Yu were examined. Diffusivity data were also fitted by D12/T - η and D12 / sqrt(T) - ρ correlations. Results showed that the He-Yu correlation has the best prediction performance while the D12/T - η correlation best fits the data with AAD% < 8%.

Original languageEnglish (US)
Pages (from-to)47-55
Number of pages9
JournalJournal of Supercritical Fluids
Volume52
Issue number1
DOIs
StatePublished - Feb 1 2010

Keywords

  • Carbon dioxide
  • Diesel fuel surrogates
  • Diffusion coefficients
  • Supercritical
  • Taylor dispersion

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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