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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/87949
標題: | 在具有瞬間擴張之U型管道中的毛細現象 Imbibition Dynamics in U-groove Microchannel with Sudden Enlargement |
作者: | 陳冠臨 Guan-Lin Chen |
指導教授: | 諶玉真 Yu-Jane Sheng |
關鍵字: | 毛細現象,開放式微流道,矩形U形槽,Concus-Finn filament,瞬間管道擴張, Capillary flow,Open microchannel,Rectangular U-groove,Concus-Finn filament,Sudden enlargement, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 本研究利用多體耗散粒子動力學模擬並探討在具有瞬間擴張且存在Concus-Finn (CF) filamet之矩形U型管道中的毛細現象。對於尾端開放之瞬間擴張管道,依據接觸角θy、與CF filamet有關之臨界角θf以及與主要流動有關之θc能分出四種流動類型。首先,在θy > θf 和 θy > θc 情況下,無邊角流動,且主要流動停止於小U形槽的末端; 其次,在θc > θy > θf 情況下,無邊角流動但主要流動存在;第三,在θf > θy > θc 情況下,邊角流動發生在大U形槽中但主要流動不存在;第四,在θy < θf 和 θy < θc 情況下,邊角流動和主要流動都出現在大U形槽中。此外,流動行為也受大U形槽長度(le)影響,對於尾端封閉之瞬間擴張管道,可以得到類似的分類結果,但是當le足夠小時,第三種情況的結果會改變,且最終可以填滿管道擴大的部分。 Imbibition dynamics in a rectangular U-groove that is connected to a sudden enlargement and complicated by the presence of Concus-Finn (CF) filaments is investigated using many-body dissipative particle dynamics. For open-ended sudden enlargement, four flow types are identified and depend on the contact angle θy, critical angle θf associated with CF filaments, and critical angle θc associated with the main flow. Firstly, for θy > θf and θy > θc, the corner flow is absent, and the main flow stops at the end of the small U-groove. Secondly, for θc > θy > θf, the corner flow vanishes, but the main flow occurs. Thirdly, for θf > θy > θc, the corner flow takes place in the large U-groove, but the main flow is still absent. Fourthly, for θy < θf and θy < θc, both the corner and main flows appear in the large U-groove. Additionally, the flow dynamics is greatly influenced by the length of the large U-groove (le). For closed-ended sudden enlargement, similar findings can be obtained. However, the outcome of the third case is altered for sufficiently small le, and the sudden enlargement can eventually be filled. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/87949 |
DOI: | 10.6342/NTU202301057 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 化學工程學系 |
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