颗粒状混合物 Zr + 0.5C 在惰性气体流中燃烧时形成的指状物

IF 0.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2024-09-06 DOI:10.3103/S1061386224700134
B. S. Seplyarskii, R. A. Kochetkov, T. G. Lisina, D. S. Vasilyev
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摘要

摘要 发现了颗粒状混合物 Zr + 0.5C 在同流氩气流中燃烧的新模式,并形成了指状不稳定前沿。观察到的现象可以用以下假设来解释:由于样品在纵向上的显著收缩,合成产物的渗透性降低,从而阻碍了氩气通过产物的过滤。气流重新定向进入颗粒与圆柱形反应器侧表面之间的间隙,促成了 "手指 "的形成。研究表明,氩气的压降导致样品尺寸在纵向减小,横向温度梯度导致表面张力作用下横截面减小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Finger Formation during Combustion of Granular Mixture Zr + 0.5C in Inert Gas Flow

A new mode of combustion of granular mixtures Zr + 0.5C in a co-current argon flow with the formation of a finger-like front instability was discovered. The observed phenomena were explained under the assumption of a decrease in the permeability of synthesis products due to significant shrinkage of the sample in the longitudinal direction, which prevented the filtration of argon through the products. Redirection of the gas flow into the gap between the granules and the side surface of the cylindrical reactor contributed to the formation of a finger. It was shown that a decrease in the sample size in the longitudinal direction is provided by the pressure drop of argon, and a decrease in the cross-section occurs under the action of surface tension forces due to a transverse temperature gradient.

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来源期刊
CiteScore
1.00
自引率
33.30%
发文量
27
期刊介绍: International Journal of Self-Propagating High-Temperature Synthesis  is an international journal covering a wide range of topics concerned with self-propagating high-temperature synthesis (SHS), the process for the production of advanced materials based on solid-state combustion utilizing internally generated chemical energy. Subjects range from the fundamentals of SHS processes, chemistry and technology of SHS products and advanced materials to problems concerned with related fields, such as the kinetics and thermodynamics of high-temperature chemical reactions, combustion theory, macroscopic kinetics of nonisothermic processes, etc. The journal is intended to provide a wide-ranging exchange of research results and a better understanding of developmental and innovative trends in SHS science and applications.
期刊最新文献
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