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A method of measuring thermal diffusivities of rocks at elevated temperatures
Author(s) -
Somerton W. H.,
Boozer G. D.
Publication year - 1961
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690070121
Subject(s) - thermal diffusivity , thermodynamics , thermal , atmospheric temperature range , materials science , constant (computer programming) , mechanics , chemistry , mineralogy , physics , computer science , programming language
A method is presented for the measurement of thermal diffusivity of synthetic and natural rock materials at elevated temperatures. The method involves heating of cylindrical test specimens at a constant rate of rise of the edge temperature and measuring the temperature differential between a point just inside the sample edge and the center of the sample. It is shown that for a fixed geometry and a constant heating rate thermal diffusivity is inversely proportional to the temperature differential. A record of the variation of diffusivity with temperature may be obtained through the temperature range of 150 to 1000°C. (except where thermal reactions occur) within a period of less than 2 hr. Measurements are reproducible within ± 10% for a given material. Accuracy of the values obtained is believed to be good; however there are no data available for direct comparison with the materials tested. Use of an approximate equation for calculation of diffusivity from experimental data leads to errors of the order of only 0.5%. Fairly good agreement was obtained between steady state measurements and measurements by the present method.