the Thermal stream in danii. Use of two probes

you are: the Thermal stream in danii

Two probes, And and were used, both had diameter of 1,5 mm and length of 82 mm. Probes were tested in paraffin and polycarbonate (leksan) prior to the beginning of work, and sometimes and in the course of measurements. Following experimental results have been received: in paraffin the probe And gives average value and a standard deviation 0,254 yo 0,007 Vt / (м*К) (12 measurements), a probe Would give 0,256 yo 0,003 Vt / (м*К) (6 measurements). Measurements were spent at temperature 20-25 °s. At Technical university of Copenhagen measurements with the same paraffin material have been executed and at the same temperatures a method of the divided core. Value 0,260 Vt / (м*К) has been received. Measurements with a probe And in leksane give 0,2193 yo 0,0003 (3 measurements), and with a probe - 0,2197 yo 0,0006 (4 measurements). Heat conductivity factor leksana, specified by the manufacturer, - 0,20 Vt / (м*К). As these substances had factors of heat conductivity 10 times less, than factors of heat conductivity of rocks to which the measurements should be spent, some comparative measurements have been executed by a method of the divided core, and as the standard were used fire-resistant glass and plavlenyj quartz. It has been established, that on dry limestone and marble the results received by methods of a needle probe and the divided core, the results reached by a method of the divided core will be co-ordinated among themselves with accuracy of 5-10%, but, are less exact, than at use of needle probes. In the substances investigated in given experiment, considerable thermal anisotropy it was not observed.