O. N. Fedyaeva, A. P. Grebennikov, A. A. Vostrikov
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引用次数: 0
摘要
摘要本文介绍了在一个加热到 873 K 的反应器中，氧气、水蒸气和水氧流体以 1 K/min 的速度和高密度试剂（\(\rrho_{/\rm O_{2}}}\le0.62\) and\(\rho_{/\rm H_{2}O}}\le5.24\) mol/dm3）对块状铋样品进行氧化的研究结果。结果包括反应混合物压力的温度依赖性。通过 Redlich-Kwong 状态方程，可以根据这些依赖关系求出氧气消耗率。结果表明，铋在氧气环境中氧化时会形成致密的氧化膜。用水蒸气处理铋时没有检测到氧化物的形成。O2 和 H2O 分子的共同作用增强了铋的氧化，并导致形成不同成分和形态的氧化物。在 \(T>720\) K 条件下，由于饱和铋蒸汽的压力较高，铋的氧化速率被观察到有所增加。
Features of Oxidation of Bismuth by High-Density Water-Oxygen Fluid
The paper presents the results of a study of oxidation of bulk bismuth samples by oxygen, water vapor, and water-oxygen fluid in a reactor heated to 873 K at a rate of 1 K/min with high-density reagents (\(\rho_{{\rm O_{2}}}\le0.62\) and \(\rho_{{\rm H_{2}O}}\le5.24\) mol/dm3). The results include temperature dependences of the pressure of the reaction mixtures. The rate of oxygen consumption is found from these dependences through the Redlich–Kwong equation of state. Formation of dense oxide film during the oxidation of bismuth in the O2 environment was shown. No oxide formation was detected during treatment of bismuth with water vapor. The combined action of O2 and H2O molecules enhances the oxidation of bismuth and leads to formation of oxides of different compositions and morphologies. At \(T>720\) K, the bismuth oxidation rate was observed to increase due to the higher pressure of saturated bismuth vapor.
期刊介绍：
Journal of Engineering Thermophysics is an international peer reviewed journal that publishes original articles. The journal welcomes original articles on thermophysics from all countries in the English language. The journal focuses on experimental work, theory, analysis, and computational studies for better understanding of engineering and environmental aspects of thermophysics. The editorial board encourages the authors to submit papers with emphasis on new scientific aspects in experimental and visualization techniques, mathematical models of thermophysical process, energy, and environmental applications. Journal of Engineering Thermophysics covers all subject matter related to thermophysics, including heat and mass transfer, multiphase flow, conduction, radiation, combustion, thermo-gas dynamics, rarefied gas flow, environmental protection in power engineering, and many others.
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