Free volume vacancy behaviour and dynamic viscosity of diesel fuels with additives at elevated temperature and pressure: thermo-occupancy function

Fatma Sahin-Dinc*, Carl Schaschke, Ugur Yahsi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The reported pressure-volume-temperature (PVT) data of five different diesel fuels at T = 297.95-373.06 K and P = 0.1-457.2 MPa were described by the Simha-Somcynsky (SS) equation of state (eos). From the equilibrium condition imposed on the eos, the hole fraction, h = h(P, T), a form of free volume measure, was computed. Furthermore, our physically-based correlation implicating the thermo-occupancy function, Yh = Yh(h, T), in terms of a function of h = h(P, T) and T has been extended in this study to estimate the dynamic viscosity, η, for the mixtures of commercially available fuels. The model bridges a direct relation from an equilibrium property, h, to the transport process, η, of the system and predicts the viscosity with the range from 0.15% to 0.31%. Newly designates 'viscoholibility' function defined as the derivative of logarithm of viscosity with respect to hole fraction has been discussed. It has an exponential decaying behaviour with respect to h.

Original languageEnglish
Pages (from-to)209-228
Number of pages20
JournalInternational Journal of Oil, Gas and Coal Technology
Volume30
Issue number2
DOIs
Publication statusE-pub ahead of print - 18 Apr 2022

Keywords

  • additives
  • diesel fuels
  • dynamic viscosity
  • Simha-Somcynsky
  • free volume
  • thermo-occupancy function

ASJC Scopus subject areas

  • Energy(all)

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