vcon¶

Variable thermal conductivity information.

1. Thermal conductivity for intact salt: \(\lambda_{IS} = \lambda_{IS,300}(300/T)^{\gamma_1}\)
2. Thermal conductivity for crushed salt: \(\lambda_{CS} = \lambda_{CS,300}(300/T)^{\gamma_1}\)

where:

\(\lambda_{CS,300} = 1.08 \left( \alpha_4 \phi^4 + \alpha_3 \phi^3 + \alpha_2 \phi^2 + \alpha_1 \phi + \alpha_0 \right)\)

Parameters related to thermal conductivity are \(\lambda_{IS,300},\gamma_1,\gamma_2,\alpha_4,\alpha_3,\alpha_2,\alpha_1,\alpha_0\) and \(\phi\). An additional parameter is the specific heat of salt.

• Group 1 - IVCON(I), VC1F(I), VC2F(I), VC3F(I)
• Group 2 - JA, JB, JC, IVCND

The parameter (I) is incremented each time Group 1 is read. Group 2 lines will refer to this parameter. Group 1 is ended with a blank line.

The following are examples of vcon. In the first example, a linear conductivity model is defined and applied at each node. The reference temperature is \(20^o C\), the reference conductivity is \(1\frac{W}{m \cdot K}\), and the change in conductivity with temperature is 0.01.

For the second example, three models are defined for the entire domain. Model 1 defines the constant thermal conductivity of 16.26 W/m K at 26.85 °C (=300 °K) for a stainless steel canister (zone 1).

Model 2 defines all parameters for a crushed salt (zone 2).

Model 3 defines reference thermal conductivity of 5.4 W/m K at 26.85 °C (=300 °K) and exponent 1.14 for the intact salt in the rest of the domain.