Use the Pyroelectricity multiphysics node (
) to simulate pyroelectric and electrocaloric effects coupling the variations of temperature and electric polarization in solid dielectrics.
The Label is the default multiphysics coupling feature name.
The Name is used primarily as a scope prefix for variables defined by the coupling node. Refer to such variables in expressions using the pattern
<name>.<variable_name>. In order to distinguish between variables belonging to different coupling nodes or physics interfaces, the
name string must be unique. Only letters, numbers, and underscores (_) are permitted in the
Name field. The first character must be a letter.
The default Name (for the first multiphysics coupling feature in the model) is
pye1.
This section defines the physics involved in the Pyroelectricity multiphysics coupling. The Electrostatics and
Heat Transfer drop-down menu lists include all applicable physics interfaces.
You can also select None from either list to uncouple the
Pyroelectricity node from a physics interface. If the physics interface is removed from the
Model Builder, for example
Electrostatics is deleted, then the list defaults to
None as there is nothing to couple to.
In Electrostatics interface, the following two domains are applicable:
In Heat Transfer in Solids interface, the applicable domains are:
You enter the Total pyroelectric coefficient pET which is a vector (SI unit: C/m
2/K) specified in the selected coordinate system. The default is to take the values
From material.
You also can enter the Reference temperature Tref with the default value of 293.15 K.
The total pyroelectric coefficient pET is a coupling coefficient measure at constant stress (unclamped) conditions. When this coupling feature is used as part of
The Piezoelectricity and Pyroelectricity Interface, the following relation between different pyroelectric coefficients holds:
where pES is the primary pyroelectric coefficient measured at constant strain (clamped), and the second term is usually called the secondary pyroelectric coefficient with
α being the thermal expansion vector and
eES being the piezoelectric coupling matrix. The software does all needed conversions automatically.