Functions
np.ndarray	cp_butland_maddison (np.ndarray T)

Variables
float	CAL = 4184.0
dict	SPECIFIC_HEAT_MODELS

Detailed Description

Temperature-dependent properties of the graphite throat insert, as named models.

The specific heat of graphite nearly triples between room temperature and the throat's running
temperature (0.71 kJ/(kg K) at 300 K, 2.0 at 2000 K). A constant room-temperature value heats the
surface too fast and so runs the surface chemistry early. Unlike conductivity, density or ash
content, the specific heat is a property of the carbon lattice and is the same for every
polygranular grade to within a few percent, so a published correlation stands for any insert.

Conductivity has no such model here: it depends on the grade (grain, porosity, graphitisation),
and a datasheet gives it at room temperature only.

Function Documentation

◆ cp_butland_maddison()

np.ndarray engine.pipeline.thermal.graphite_properties.cp_butland_maddison ( np.ndarray T )

Specific heat of graphite [J/(kg K)], Butland & Maddison, J. Nucl. Mater. 49 (1973) 45-56.

cp = 0.54212 - 2.42667e-6 T - 90.2725/T - 43449.3/T^2 + 1.59309e7/T^3 - 1.43688e9/T^4
in cal/(g K), T in K, fitted 200-3500 K. Outside that range it is held at the ends.

Definition at line 22 of file graphite_properties.py.

Variable Documentation

◆ CAL

float engine.pipeline.thermal.graphite_properties.CAL = 4184.0

Definition at line 19 of file graphite_properties.py.

◆ SPECIFIC_HEAT_MODELS

dict engine.pipeline.thermal.graphite_properties.SPECIFIC_HEAT_MODELS

Initial value:

=  {
    "constant": None,
    "butland_maddison_1973": cp_butland_maddison,
}

Definition at line 34 of file graphite_properties.py.