Quantitative thermal analysis V. Role of the flowing gas phase in the analysis of disperse materials

Autor:	V. P. Egunov, A. D. Kiyaev, A. N. Izmalkov
Rok vydání:	1985
Předmět:	Thermal conductivity Chemistry Differential thermal analysis Phase (matter) Thermal transpiration Thermodynamics chemistry.chemical_element Thermal analysis Thermal conduction Helium Volumetric flow rate
Zdroj:	Journal of Thermal Analysis. 30:849-859
ISSN:	1572-8943 0368-4466
DOI:	10.1007/bf01913312
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::eee767384158b5b085380a808b220d89 https://doi.org/10.1007/bf01913312 Zobrazit plný text záznamu Full text from SpringerLink