Simplified Transient Hot-Wire Method for Effective Thermal Conductivity Measurement in Geo Materials: Microstructure and Saturation Effect

Figure 10

Evolution of 𝜆₁ (black lozenges) and 𝜆₂ (white squares) thermal conductivities with time. The 𝜆₁ and 𝜆₂ are calculated from the curve slope measured in the [−2−1]ln(𝑡) and [+1+2]ln(𝑡) intervals (Figure 9). According to the drastic 𝑎₁ increase the 𝜆₁ values decrease from 0.9 to 0.2 W/mK during the 20 first days. The 𝜆₂ shows dispersive values around 0.97 W/mK.