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研究生:湯勝評
研究生(外文):Sheng-Ping Tang
論文名稱:十二烷基硫酸鈉水溶液液滴撞擊木板之行為研究
論文名稱(外文):A Study on the Drop Impingement for SDS Solutions on Wood Surface
指導教授:林析右
指導教授(外文):Shi-Yow Lin
口試委員:蔡瑞瑩陳立仁
口試委員(外文):Ruey-Yug TsayLi-Jen Chen
口試日期:2019-07-31
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:化學工程系
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2019
畢業學年度:107
語文別:中文
論文頁數:51
中文關鍵詞:十二烷基硫酸鈉液滴撞擊木板非洲黑檀
外文關鍵詞:SDSDrop ImpingementWood SurfaceDiospyros crassiflora
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近年來,液滴撞擊固體平板後的潤濕行為已成為許多人討論的焦點,在日常生活與工業界中都有其應用實例,例如高分子 3D列印、噴墨印表機的噴墨行為及工業上的噴塗程序等;然而,因液滴撞擊平板的過程極為快速,人眼難以分辨,故需仰賴高速攝影機來觀察其細微變化。木頭廣泛被運用在建築和家具上的材料中,故本研究挑選多種木頭來當我們的撞擊基材。另使用不同的水砂紙研磨出固定粗糙度的木頭平板,並使用高速攝影機 (6770 ~ 90k fps) 來記錄室溫下界劑水溶液液滴撞擊木材平板後的液滴潤濕行為。
本研究的第一部分探討純水液滴 (D0 = 2.39 mm) 於不同撞擊高度下 (H = 1~40 cm),撞擊非洲黑檀平板表面 (Rq = 0.60 m )的潤濕行為。實驗發現在慣性力大 (H = 10 ~ 40 cm)的情況下,液膜的擴張速度快;撞擊液滴之潤濕直徑達到最大之瞬間的時,撞擊液滴展現出如釘栓般的pinning 行為;在慣性力小 (H = 1 ~ 5 cm)時,液膜的擴張速度慢,撞擊液滴在中心位置持續震盪,潤濕直徑呈震盪變化。
第二部分觀察不同濃度的十二烷基硫酸鈉 (SDS)水溶液液滴於同撞擊高度 (H = 40公分)下撞擊非洲黑檀平板 (Rq = 0.60 m) 之飛濺與潤濕現象。於不同濃度 (40 < γ = 72 mNm) 下,SDS(aq) 均在其達到最大潤濕半徑後,產生pinning的行為。此外,SDS(aq)的tmaxi 隨著表面張力的上升而下降,同時,我們也發現當濃度達到臨界微胞濃度後,其tmaxi 是相同的;於純水及SDS溶液中,純水的最大潤濕直徑擴散因子 (Dmax/D0)遠小於SDS水溶液。最後,SDS(aq)之飛濺液滴數目(N) 隨撞擊高度增加而遞增。
第三部分探討純水撞擊五種不同粗糙度之木材平板的臨界撞擊高度 (Hc),並研究木材的親疏水性與pinning行為。首先,我們觀察到Hc會隨著粗糙度的增加而下降;再者,使用固著液滴接觸角量測儀,在恆溫、恆濕 (飽和濕度)與撞擊高度 (H) = 0 cm的情況下,測得非洲黑檀的前進接觸角 (adv = 66.3)與柳桉木 (adv = 143.5)。最後,使用軟體分析純水撞擊柳桉木於 H = 30公分下的潤濕現象,並探討液膜、指狀液柱 (finger)與飛濺液滴的關聯性。
近年來,液滴撞擊固體平板後的潤濕行為已成為許多人討論的焦點,在日常生活與工業界中都有其應用實例,例如高分子 3D列印、噴墨印表機的噴墨行為及工業上的噴塗程序等;然而,因液滴撞擊平板的過程極為快速,人眼難以分辨,故需仰賴高速攝影機來觀察其細微變化。木頭廣泛被運用在建築和家具上的材料中,故本研究挑選多種木頭來當我們的撞擊基材。另使用不同的水砂紙研磨出固定粗糙度的木頭平板,並使用高速攝影機 (6770 ~ 90k fps) 來記錄室溫下界劑水溶液液滴撞擊木材平板後的液滴潤濕行為。
本研究的第一部分探討純水液滴 (D0 = 2.39 mm) 於不同撞擊高度下 (H = 1~40 cm),撞擊非洲黑檀平板表面 (Rq = 0.60 m )的潤濕行為。實驗發現在慣性力大 (H = 10 ~ 40 cm)的情況下,液膜的擴張速度快;撞擊液滴之潤濕直徑達到最大之瞬間的時,撞擊液滴展現出如釘栓般的pinning 行為;在慣性力小 (H = 1 ~ 5 cm)時,液膜的擴張速度慢,撞擊液滴在中心位置持續震盪,潤濕直徑呈震盪變化。
第二部分觀察不同濃度的十二烷基硫酸鈉 (SDS)水溶液液滴於同撞擊高度 (H = 40公分)下撞擊非洲黑檀平板 (Rq = 0.60 m) 之飛濺與潤濕現象。於不同濃度 (40 < γ = 72 mNm) 下,SDS(aq) 均在其達到最大潤濕半徑後,產生pinning的行為。此外,SDS(aq)的tmaxi 隨著表面張力的上升而下降,同時,我們也發現當濃度達到臨界微胞濃度後,其tmaxi 是相同的;於純水及SDS溶液中,純水的最大潤濕直徑擴散因子 (Dmax/D0)遠小於SDS水溶液。最後,SDS(aq)之飛濺液滴數目(N) 隨撞擊高度增加而遞增。
第三部分探討純水撞擊五種不同粗糙度之木材平板的臨界撞擊高度 (Hc),並研究木材的親疏水性與pinning行為。首先,我們觀察到Hc會隨著粗糙度的增加而下降;再者,使用固著液滴接觸角量測儀,在恆溫、恆濕 (飽和濕度)與撞擊高度 (H) = 0 cm的情況下,測得非洲黑檀的前進接觸角 (adv = 66.3)與柳桉木 (adv = 143.5)。最後,使用軟體分析純水撞擊柳桉木於 H = 30公分下的潤濕現象,並探討液膜、指狀液柱 (finger)與飛濺液滴的關聯性。
中文摘要 i
目錄 ii
表目錄 iii
圖目錄 iv
符號表 vi
第一章、簡介 1
1.1 液滴撞擊 1
1.2 界面活性劑 2
第二章、文獻回顧 4
2.1 液滴撞擊的控制參數 4
2.2 液滴撞擊的形態的變化 5
2.3 液滴撞擊後之液滴飛濺行為 7
2.4 飛濺液滴物理量之研究 8
2.5 懸垂液滴法 9
第三章、實驗設備 10
3.1 主要儀器設備 10
3.2其它儀器設備 12
3.3實驗藥品與耗材 12
3.4 儀器校正 13
3.5 液滴大小測量 14
3.6 不同粗糙度之木頭平板製程及量測 14
3.7 液滴撞擊影像拍攝及飛濺液滴計算 15
3.8 實驗條件選定 16
第四章、實驗結果 18
4.1純水液滴撞擊非洲黑檀木頭平板表面後的行為探討 18
4.2不同表張水溶液液滴撞擊非洲黑檀木頭平板表面後的現象探討 22
4.3 純水液滴撞擊不同木材的現象探討 33
第五章、結論與建議 38
第六章、參考文獻 39
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