2-domain Tait PVT model

The modified 2-domain Tait PVT model is used to determine the density of the material as a function of the temperature and pressure. This variation impacts on many aspects of the flow simulation.

The 2-domain Tait PVT model is given by the following equations:

where:

• is the specific volume at temperature and pressure
• is the specific volume at zero gauge pressure
• is the temperature, in K
• is the pressure, in Pa
• is a constant, 0.0894
• accounts for the pressure sensitivity of the material and is defined below.

The upper temperature region is described by the equations:

where:

• ,,, and (which represents the volumetric transition temperature, , at zero gauge pressure) are data-fitted coefficients.

The lower temperature region is described by the equations:

where:

• , , , , , , , and are data-fitted coefficients

Note: The value for crystalline resins only applies to temperatures below the transition temperature.

The dependence of on pressure can be described by the equation:

where:

• and are data-fitted coefficients