Thermal properties of Avery Island salt to 573/sup 0/K and 50-MPa confining pressure

Technical Report · Tue Mar 24 04:00:00 EST 1981

DOI:https://doi.org/10.2172/6420528· OSTI ID:6420528

Durham, W B; Abey, A E

Thermal conductivity, thermal diffusivity, and thermal linear expansion were measured on two samples of Avery Island rock salt up to simultaneous temperatures and pressures of 573/sup 0/K and 50 MPa. Thermal conductivity at room temperature measured 6.3 +- 0.6 W/mK and decreased monotonically to 3.3 +- 0.4 W/mK at 573/sup 0/K. Thermal diffusivity decreased from 3.0 +- 0.8 x 10/sup -6/ m/sup 2//s at room temperature to 1.4 +- 0.5 x 10/sup -6/ m/sup 2//s at 573/sup 0/K. Thermal linear expansivity increased from 4.8 +- 0.3 x 10/sup -5/ K/sup -1/ at room temperature to 5.6 +- 0.3 x 10/sup -5/ K/sup -1/ at 573/sup 0/K. The thermal properties showed no measurable (+-5%) dependence on confining pressure from 0 to 50 MPa for any temperature tested. The thermal conductivity values were not distinguishable (+-5%) from intrinsic (single crystal) values measured by others. Diffusivity fell about 20% below intrinsic values, and linear expansivity about 20% above intrinsic values. Thermal conductivity values for Avery Island salt measured recently by Morgan are as much as 50% lower than values measured here and were probably strongly affected by sample handling prior to measurement. The pressure independence of the thermal properties measured in our study suggests that thermally-induced microfracturing is nearly nonexistent. This lack of thermal cracking is consistent with the high (cubic) symmetry of halite.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6420528
• Report Number(s): UCRL-53128; ON: DE81024072
• Country of Publication: United States
• Language: English

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