Conductivity_Cryogenic
The Cryogenic Conductivity function provides conductivity for several materials as a function of temperature but only at very low temperature (0.05 K < T < 2 K). The curve fits used for this library are from:
J.R. Olson, "Thermal conductivity of some common cryostat materials between 0.05 K and 2 K," Cryogenics, Vol. 33, No. 7 (1993)
The calling protocol is:
k = Conductivity_Cryogenic(M$, T)
where M$ is the material
T is the temperature (in K, C, R, or F)
k is conductivity (in W/m-K or Btu/hr-ft-R)
The materials available include:
M$ = 'Stycast_1266' which corresponds to Stycast 1266 epoxy from Emerson & Cuming, Inc.
M$ = 'Stycast_1266_CaCO3' which corresponds to Stycast 1266 epoxy with CaCO3 powder (grain size 1-5 micron) from Emerson & Cuming, Inc.
M$= 'Stycast_2651MM' which corresponds to Stycast 2651MM epoxy which has crystalline fillers from Emerson & Cuming, Inc.
M$ = 'Stycast_2850FT' which corresponds to Stycast 2850FT epoxy which also has crystalline fillers from Emerson & Cuming, Inc
M$ = 'Vespel_SP22' which corresponds to Vespel SP22 from DuPont
M$ = 'CuNi' which corresponds to CuNi tubing (70% Cu by weight) from Oxford Instruments
M$ = 'Advance_Wire' which corresponds to a CuNi alloy (55% Cu by weight) from Bergquist Co.
M$ = 'NbTi_rod' which corresponds to NbTi alloy rod (45% Nb by weight) from Teledyne and Supercon
M$ = 'NbTi_wire' which corresponds to NbTi alloy wire (45% Nb by weight) which is cold-worked during manufacturing from Teledyne and Supercon
M$ = 'a-SiO2' which corresponds to amorphous SiO2
Example:
$UnitSystem SI Mass J K Pa
$VarInfo k Units = 'W/m-K'
T = 0.8 [K]
M$ = 'Stycast_1266'
k = Conductivity_Cryogenic(M$,T)
{
Solution: k = 0.02552 [W/m-K]
}