本研究利用AGMD(Air gap membrane distillation)加上攪拌式葉片應用於乙醇分離純化系統，使膜面表層附近溫度和濃度邊界厚度降低，增加薄膜表面剪應力，基於此原理上運用CFD軟體配合田口分析，選擇最佳模組條件進行實驗，探討AGMD在不同的攪拌速度、進料溫度、進料流量、進料濃度對於通量及乙醇分離因子的影響，結果顯示滲透通量和分離因子會隨著溫度上升，攪拌的速度愈快分離因子愈高，表示系統受極化現象愈少，另外實驗也顯示此系統薄膜蒸餾，可以有效純化乙醇水溶液，經由連續兩次純化分離後濃度可以由5%濃度提升至48.6%以上。

Applying rotation blade to increase turbulence intensity of flow nearby the membrane can decrease both temperature and concentration polarizations and therefore can enhance the permeating flux and separation factor. The thesis uses numerical simulation to investigate the wall shear field in a hot cavity circulation region of an air gap membrane distillation system for ethanol extraction by computational fluid dynamics (CFD) and Taguchi analysis to find the optimal parameters. The results validate that wall shear near the membrane increases greatly with rotational motion. Different inpouring feed flux, concentration, stirring speed, and feed temperature will influence the permeating flux and separation factor.

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