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題名 | A Mathematical Model for Carbothermic Nitridation of Carbon/Aluminium Oxide Pellet-Kundsen Diffusion Region=碳/金屬氧化物碳熱還原氮化反應之數學模式--諾森控制效應 |
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作者 | 陳錫圭; 林俊一; Chen, Hsi-kuei; Lin, Chun-i; |
期刊 | Journal of the Chinese Institute of Chemical Engineers |
出版日期 | 19990300 |
卷期 | 30:2 1999.03[民88.03] |
頁次 | 頁161-166 |
分類號 | 341.393 |
語文 | eng |
關鍵詞 | 碳/金屬氧化物; 碳熱還原; 氮化反應; 諾森控制效應; Mathematical model; Carbothermic nitridation; Aluminium oxide; Knudsen diffusion; |
中文摘要 | 本研究報告碳熱還原三氧化二鋁製備氮化鋁之數學模式。我們以區域模式模擬諾 森擴散反應系統。在模擬過程中考慮了化學反應速率、氣體擴散速率及氣體薄膜阻力對反應 速率所造成的影響。 我們將數學模式進一步無因次化後得到σ�插Bβ�窗Bβ�砥Bγ和 N □ 五個無因次常數。 我們發現反應速率會隨著降低σ�援峉]�筏�或增加β�砥Bγ或 N □值而 加快。此外我們還發現當系統位於分子擴散範圍內其反應速率較位於諾森擴散範圍內者快。 |
英文摘要 | A mathematical model has been proposed for describing the nitridation of carbon/aluminium oxide pellet in a stream of nitrogen. Based on the model, dimensionless governing equations were derived to represent the system in Knudsen diffusion region. Effects of the following five parameters on the conversion of solid C and yield of solid E have been examined: the reaction/diffusion ratio σ��, the reactivity ratios β�� and β��, the reactant amount raio γ and the Sherwood number N □. The reaction was found to be enhanced when the values of σ�� or β�� were decreased, or the values of β��, γ or N □ were increased. The reaction rate was also found to be increased by preparing the solid sample in a powder form instead of pellet form. |
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