The name is absent



(b)


SAFT


Chainsmadeof
mSEGMENTS


σ

REFERENCE FLUID
Ofhardspheres


SAFT - D


σ

REFERENCE FLUID DIMER FLUID     CHAINS MADE OF

Ofhardspheres                       m segments

Figure 2.3: Schematic illustration of the differences between the SAFT and SAFT-D
approaches.

2.2.2 Dispersion term

Now that the equation of state for hard chains is defined, the contribution that
will account for the dispersive interactions between molecules is to be added. The
model potential used to describe the attraction is given by the square-well potential.

(2.19)

where A is the width of the potential well, A = 1.5σ. An accurate expression for this
attraction∕dispersion contribution to the free energy was developed by Gross and
Sadowski [48] based on the extension of the perturbation theory of Barker and Hen-

44



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