Liquid viscosity

The absolute viscosity of the liquid is computed with experimental coefficients.

First the experimental coefficient b1 is calculated:

where:

• C1 and C2 are constants determined by experimental measurements.

• K1 and K2 are experimental coefficients which depend on the type of fuel.

Then we compute a “density related to viscosity”:

Where C3 and C4 are experimental constants.

The absolute viscosity of the liquid is given by:

Equation 18: Viscosity of liquid at P and T

K3, K4, K5, K6 are experimental coefficients which depend on the type of fuel.

The {liquid+vapor} viscosity is computed with the air volumetric fraction:

Equation 19: Viscosity of {liquid+vapor}