- 作者: 王茂齡; 陳淑瑩
- 作者服務機構: 清華大學化學工程學系
- 中文摘要: 本文乃由理論觀點分析研究一個活化試劑由核心球體經由一塗覆薄膜至萃取相之質量傳送。傳送系統則由一具有可變邊界條件之非穩定擴散方程式來加以描述,此種可變邊界條件乃與活化試劑在中央核心球體之濃度和在萃取相之濃度有關。系統方程式則利用Duhamel理論加以解析,以獲得其解,在解析步驟中,在中央核心球體之活化試劑濃度保持固定不變及變動之兩種情形被考慮為邊界條件,當然萃取相之活化試劑之濃度也會影響在塗覆薄膜內濃度,由解析理論所獲之結果可應用於一般球體釋放控制程序之系統。
- 英文摘要: The mass transfer of an active reagent through a coated film from a core ball to the extraction phasewas studied theoretically. An unsteady diffusion equation with varying boundary conditions, which relatedto the concentration of the active reagent in the center core and the extraction phase, was used to describethe transport of the active reagent within the coated film. The well known Duhamel's theory was employedto obtain the solution. The cases for a constant concentration of the active reagent and a varying concen-tration of the active reagent within the coated ball, which affected the concentration of the active reagentwithin the coated film, were both considered as the boundary conditions in solving the diffusion equation.The concentration of the active reagent at the extraction phase (water phase) also influenced the concen-tration of the active reagent within the coated film. The results obtained are, in general, applicable torelease controlled balls of similar type.
- 中文關鍵字: mass tranfer; coated film; controlled release
- 英文關鍵字: --