the Thermal stream in velikobritanii. Heat conductivity

you are: the Thermal stream in velikobritanii

When there was a core, almost all values of factor of heat conductivity on which it was informed, have been received with use of a method of the divided core on the samples sated with water in the conditions of vacuum. Bullard and Niblett and Benfild have given the detailed description of the methods of measurement. Bullard and Niblett as the basic standard used the crystal quartz verified with quartz glass. Accuracy of measurements Benfilda on the average made +4,7% though errors in some of its measurements reached 8,9%. He considers, that nonplanar surfaces of samples of the rocks, creating distinctions in a thickness of a layer of greasing which it used for improvement of thermal contact between breed and brass disks were the reason of it. Bullard and Niblett for contact improvement used autotractor oil or silikonovuju greasing and achieved in the samples of high degree of smoothness; therefore accuracy of their measurements, obviously, was above, than at Benfilda. At checks with reference quartz the error appeared less than 1%, but in measurements of unknown values they did not consider a question on errors of measurements.

Bott, etc., Tammemagi and Uajldon, and also Richardson and Oksburg used the methods of the divided core similar described Berchem, with application polikarbonatnyh auxiliary standards which were periodically calibrated on quartz. In Richardson's measurements and Oksburga the relative error of reproducibility at measurement on one unknown sample has made 4%. Tammemagi and Uajldon have estimated accuracy of the measurements in ±2%. In a chink the Uinterborn-valve it has been executed about 600 measurements of factor of heat conductivity with use of a needle probe. Application of this method on samples not completely litifitsirovannyh deposits immediately after their extraction from a chink allows to spend measurements before drying of breeds. As such deposits possess high porosity, often happens difficultly to reproduce the natural maintenance in them waters by means of laboratory procedures of saturation. Therefore the way of a needle probe possesses advantage in comparison with the divided core and other methods of the established mode in which thorough training of samples is required. One more advantage is speed of measurement as thus it is easy to investigate much is exemplary and by that it is possible to reduce to a minimum of a problem of reception of representative sample.

When there was no core, heat conductivity measurements were spent Oksburgom, etc. and Uajldonom, etc. on shlame, taken of a chisel solution. These researchers used a method ' pill-boxing ', described in work Sassa and dr. Errors in this method arise because of uncertainty of porosity and contaminations shlama a material of several stratigraficheskih the horizons opened with a chink.