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

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