• 作者： Huang, Ting-Chia; Chen, Huey-Ing
• 中文摘要： 本文係有關於He、N/sub 2/及CO/sub 2/在支式氧化鋁薄膜中之透過行為的研究。操作溫度在299.4至372.7K,壓力在約220KPa範圍內作氣體透過係數之測定,結果顯示氣體在膜中之傳送機構可以Knudsen擴散、Poiseuille層流及表面擴散模式來描述,但其中以Knudsen擴散佔最重要角色; 由各純成分氣體之透過係數與溫度及壓力之關係可獲得一半經驗公式來表示。假設氣體遵循理想氣體行為,且透過器為完全混合型模式,由He、N/sub 2/及CO/sub 2/純成分氣體之透過係數可相當準確的估算He-N/sub 2/、 He-CO/sub 2/及N/sub 2/-CO/sub 2/三混合系統之透過速率,但對N/sub 2/-CO/ sub 2/系統則有較大之偏差。若修正組成對黏度之影響,則可使N/sub 2/- CO/sub 2/系統之估計值與實驗值相當吻合。
• 英文摘要： The permeations of He, N/sub 2/, and CO/sub 2/ through the supported alumina membrane were studied in this work. The permeabilities of gases were measured under temperature ranges of 299.4-372.7K and pressure up to 220kPa. Experimental results showed that the gas transported through the alumina membrane can be described by the combination of Knudsen diffusion, Poiseuille flow, and surface diffusion. However, Knudsen diffusion played the most important role on the permeabilities of gases. A semi-empirical expression of permeability was obtained as a function of temperature and pressure for each pure gas. The permeate fluxes of He-N/sub 2/, He-CO/sub 2/, and N/sub 2/- CO/sub 2/ mixtures were calculated from permeabilities of pure gases with assumptions of perfect gas behavior and complete mixing permeator. The predicted data were coincidence with the experimental results except for N/sub 2/-CO/sub 2/ mixture. The deviation of permeability between the predicted and the experimental data for N/sub 2/-CO/sub 2/ system can be reduced by taking into account of viscosity effect.
• 中文關鍵字： 氧化鋁膜; 滲過; 滲透率; 擴散; 傳輸機構
• 英文關鍵字： Alumina Membrane; Permeation; Permeability; Diffusion; Transport Mechanism