Quantitative thermal analysis V. Role of the flowing gas phase in the analysis of disperse materials |
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Authors: | V P Egunov A D Kiyaev A N Izmalkov |
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Institution: | (1) Kuybyshev Polytechnical Institute, Kuybyshev, U.S.S.R. |
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Abstract: | In the analysis of disperse materials, the thermophysical characteristics (rate, thermal conductivity, thermal capacity) of the gas flowing through the pores of the sample are of great importance in determinations of the heats of phase transformations. We have found that the peak areas corresponding to the phase transformations may either decrease or increase with increasing flow rate of the gas. The largest errors (as high as 15%) caused by gas flow in the pores of the disperse material occur when the thermal conductivities of both the solid material and the gas in which the analysis is performed are low. The experimentally derived relationship between the peak area, the flow rate and thermal conductivity of the gas, and the dispersity and thermal conductivity of the solid phase permits calculation of the possible error, and hence application of measures for its reduction.
Zusammenfassung Bei der Analyse disperser Materialien sind die thermophysikalischen Kenndaten (Geschwindigkeit, Wärmeleitfähigkeit, Wärmekapazität) des durch die Poren der Probe strömenden Gases für die Bestimmung der Phasenübergangswärmen von großer Wichtigkeit. Wir haben festgestellt, daß die den Phasenübergängen zuzuschreibenden Peakflächen mit steigender Strömungsgeschwindigkeit des Gases entweder kleiner oder größer werden. Die größten durch die Gasströmung in den Poren verursachten Fehler (bis zu 15%) treten dann auf, wenn sowohl die Wärmeleitfähigkeit des Festkörpers als auch die des Gases, in dem die Analyse ausgeführt wird, niedrig sind. Die experimentell abgeleitete Beziehung zwischen der Bergfläche, der Strömungsgeschwindigkeit und Wärmeleitfähigkeit des Gases und der Dispersität und Wärmeleitfähigkeit der festen Phase erlaubt die Berechnung des möglichen Fehlers und damit das Ergreifen von Maßnahmen zu dessen Verringerung.
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