Thermal properties of Climax stock quartz monzonite to 523 K and 50-MPa confining pressure
Thermal conductivity and thermal diffusivity were measured on three samples of Climax stock quartz monzonite at temperatures to 523 K and hydrostatic confining pressures to 50 MPa. Thermal conductivity at room temperature increases slightly with pressure from 2.75 W/mK at 0.1 MPa to 2.90 W/mK at 50 MPa within a precision of 0.07 W/mK. Cycling the rock to temperatures as high as 473 K at pressures as low as 3 MPa does not alter the room temperature conductivity within a precision. Consistent with the conductivity independence of pressure and temperature cycling, scanning electron microscopy reveals no changes in crack structure of the rock with conditioning treatments as severe as 573 K at 0.1 MPa. Thermal conductivity falls with temperature approximately as 1/T above 373 K and slightly less rapidly below 373 K. Sample-to-sample variation in thermal conductivity at 313 K is at least 0.2 W/mK. Thermal diffusivity of the rock measures 1.25 +- 0.4 x 10{sup -6} m{sup 2}/s and has approximately the same temperature dependence as does conductivity.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 59266
- Report Number(s):
- UCRL--53349; ON: DE83003831
- Country of Publication:
- United States
- Language:
- English
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