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

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 state (eos). From equilibrium condition imposed on eos, hole fraction, h (P, T), a form free volume measure, was computed. Furthermore, our physically-based correlation implicating thermo-occupancy function, Yh Yh(h, in terms function T) has been extended this study to estimate dynamic viscosity, η, for mixtures commercially available fuels. model bridges direct relation from an property, h, transport process, system predicts viscosity with range 0.15% 0.31%. Newly designates 'viscoholibility' defined as derivative logarithm respect fraction discussed. It exponential decaying behaviour h. [Received: February 24, 2021; Accepted: May 14, 2021]