Investigation of the Thermal Conductivity of Ice.
Measurement of the thermal conductivity of ice I (the normal phase at atmospheric pressure) over the temperature range 4 to 273 K has been attempted. First the linear absolute method was employed in which an adiabatically shielded copper block (1 kg) provided an infinitely variable heat-sink tempera...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
1970
|
| Subjects: | |
| Online Access: | http://www.dtic.mil/docs/citations/AD0727185 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0727185 |
| Summary: | Measurement of the thermal conductivity of ice I (the normal phase at atmospheric pressure) over the temperature range 4 to 273 K has been attempted. First the linear absolute method was employed in which an adiabatically shielded copper block (1 kg) provided an infinitely variable heat-sink temperature with a stability of better than 1 nK/hr. Sublimation precluded adiabatic operation above 175 K; inadequate thermal coupling was apparent below this temperature. Measurements were taken on nylon both to obtain needed data and to confirm the function of the instrument; data is reported over a range of 4 to 360 K with an accuracy of 0.6% or better. The cylindrical method was adopted to overcome sublimation and bonding difficulties with ice. This allows positioning of the heating unit and measuring thermocouples within the sample; thus no shielding or hard vacuum is necessary to overcome heat loss problems. The preliminary investigation showed a random scatter of plus or minus 5%. Temperature fluctuations within the refrigerant bath were responsible for most of this scatter. By using an adjustable form factor the data follows a most probable thermal conductivity curve constructed by Morris and Smith (45) from all previously reported data. (Author) Report on Basic Laboratory Experiments. |
|---|