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Propagation of acoustic waves in pitch

Propagation of acoustic waves in pitch The speed of ultrasound in coal pitch is investigated as a function of the quantity of α1 fraction and the pitch temperature. It is found that the speed of the ultrasound increases with increase in the quantity of α1 fraction. The type of pitch determines the specifics of the actual dependence. The temperature dependence of the speed of ultrasound in pitch has distinct points of inflection, indicating rheological transitions in the pitch on heating. The effective activation energy of the rheological transitions is calculated. There is a discrepancy between the softening temperature of the pitch and the transition temperature to the fluid state. The transition temperature to the fluid state measured by means of ultrasound may be used as a technological parameter of the pitch. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Coke and Chemistry Springer Journals

Propagation of acoustic waves in pitch

Negutorov, N.; Pykhova, N.; Baranov, A.; Panchu, P.
Coke and Chemistry , Volume 57 (8) – Nov 23, 2014
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References (14)

Publisher
Springer Journals
Copyright
Copyright © 2014 by Allerton Press, Inc.
Subject
Chemistry; Industrial Chemistry/Chemical Engineering
ISSN
1068-364X
eISSN
1934-8398
DOI
10.3103/S1068364X14080092
Publisher site
See Article on Publisher Site

Abstract

The speed of ultrasound in coal pitch is investigated as a function of the quantity of α1 fraction and the pitch temperature. It is found that the speed of the ultrasound increases with increase in the quantity of α1 fraction. The type of pitch determines the specifics of the actual dependence. The temperature dependence of the speed of ultrasound in pitch has distinct points of inflection, indicating rheological transitions in the pitch on heating. The effective activation energy of the rheological transitions is calculated. There is a discrepancy between the softening temperature of the pitch and the transition temperature to the fluid state. The transition temperature to the fluid state measured by means of ultrasound may be used as a technological parameter of the pitch.

Journal

Coke and Chemistry – Springer Journals

Published: Nov 23, 2014

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