Card 9 - PHASE Phase Change Elements

KODE

KODE is the code PHASE (or 4)

N1

N1 is the phase change element number, or a group name.

T1

T1 is the phase change temperature.

T2

T2 is the value of the element's latent heat.

T3

T3 is the ratio of the thermal capacitance above the phase change temperature to the thermal capacitance below the phase change temperature. If a temperature-dependent capacitance is specified in a table, this value is automatically updated.

Code example

XCAP 62 0 12
PHASE 62 50 80 2

Element 62 is a phase change element which has a phase change temperature of 50 degrees, latent heat of 80, and thermal capacitances of 12 and 2*12 = 24 below and above the phase change temperature respectively.

Notes

This card provides an alternate method of defining phase change properties for both geometric and non-geometric elements. The preferred method of defining phase change properties for geometric elements is through MAT Cards.

The capacitance of the N1 element(s) must be non-zero, they may be either created by the COND module from geometry or defined on XCAP Cards. The capacitance is interpreted to be the capacitance value below the phase change temperature.

Phase change elements may be used in transient analysis, or in steady-state analysis with MCV elements to model phase change in fluid flow.