海水取之不盡，為未來解決淡水資源不足的重要途徑之一，因此海水淡化的技術日漸受到重視。直接接觸薄膜蒸餾法(DCMD)應用於海水淡化系統，由於設備簡易且可使用較低階能源做為加熱熱源，這些皆顯示其開發價值之處。
本研究主要目的有三，分別為理論值模擬、特殊流道之測試以及低濃度食鹽水(3.5wt%)之試做。模擬部分顯示預測效果良好，平均誤差在10%左右。特殊流道部分包含了兩種形式流道之測試，分別為加裝渦流產生裝置之流道以及非直線型之流道，共六種特殊流道被實驗測試。實驗結果顯示，裝置渦流產生器的最大蒸餾增益比值(特殊流道與直線流道之蒸餾量比值)皆比非直線流道好，而若再考量到增益效率（蒸餾增益比值除上流道壓差比值），則以突縮突擴流道表現效果最佳，渦流裝置流道效果次之。若以泵功耗(pumping power)為主要考量，則渦流裝置之流道皆能有好的效益。最後，為達海水淡化之終極目標，嘗試以食鹽水為進料工作流體進行實驗，除了食鹽水溶液本身對蒸餾量的影響外，還必須考量到溶液與系統內部管件所發生的化學反應，於測試端內部產生的化學沉澱物之因素，整體而言，食鹽水溶液的蒸餾量比純水少了約5~8%。

關鍵字:薄膜蒸餾、渦流產生器、海水淡化

中文摘要 I
英文摘要 III
致謝 IV
目錄 VI
圖目錄 VIII
表目錄 X
符號說明 XI
第一章 序論 1
1-1前言 1
1-2薄膜蒸餾法(MD)之簡介 3
1-3 直接接觸薄膜蒸餾法之簡介 3
1-4 文獻回顧 5
1-4-1直接接觸薄膜蒸餾理論 5
1-4-2 濃度極化 8
1-4-3 各種擾流裝置介紹 11
第二章 理論模式 18
2-1質量傳輸 18
2-2熱量傳輸 26
2-3 溫度極化(TEMPERATURE POLARIZATION) 28
2-4 濃度極化現象(CONCENTRATION POLARIZATION) 29
第三章 實驗方法 32
3-1實驗設備簡介 32
3-2流道設計 40
3-3實驗步驟 45
第四章、結果與討論 48
4-1直線流道實驗與理論分析 48
4-1-1直線流道實驗 48
4-1-2直線流道模擬 51
4-2 特殊流道測試比較 56
4-3 食鹽水試做 74
第五章 結論 76
參考文獻 78
附錄 A 83
空氣間隙薄膜蒸餾法(AIR GAP MEMBRANE DISTILLATION，AGMD) 83
空氣掃掠薄膜蒸餾法 (SWEEPING GAP MEMBRANEDISTILLATION ,SGMD) 83
真空薄膜蒸餾法 (VACUUM MEMBRANE DISTILLATION，VMD) 84

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