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研究生:林昉瑆
研究生(外文):Fang-Hsing Lin
論文名稱:液滴撞擊平板之行為探討-高速攝影
論文名稱(外文):A Study on the Droplet Impact Behavior–High Speed Image Acquisition
指導教授:林析右
指導教授(外文):Shi-Yow Lin
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:2008
畢業學年度:96
語文別:中文
論文頁數:50
中文關鍵詞:高速攝影
外文關鍵詞:High Speed Image Acquisition
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液滴撞擊固體平板上之研究已逾一世紀,許多文章已討論不同物理條件對液滴擴
張的影響結果。例如:增加撞擊速度或液滴直徑會使撞擊後擴張速度加快;增加表面
能或液體黏度將會使擴張速度減緩等。
本研究探討兩個議題:(1)平板效應−−使用五種不同材質的平板,其純水液體在
不同平板上之平衡接觸角之大小依序為paraffin>Teflon>rough glass>quartz>clean
glass。使純水液滴撞擊平板,再從中分別探討較親水與較疏水材質間的差異。;(2)
界劑效應−−使用不同界劑水溶液液滴撞擊於乾淨玻璃平板上,液滴撞擊平板後,擴張
的過程表面積為原來滴落液滴的6~10 倍,分別比較不同表面張力液滴於撞擊固體平
板後,液滴擴張的的情況。
利用高速攝影取像、並從液滴影像所取得之液滴邊界,分別計算出D0(液滴直
徑)、u0(撞擊速度)、t0(接觸影像時間),再以θ(接觸角)、d(擴張直徑)、H(振
蕩高度)對t (時間)與spreading factor (d/D0)、apex factor (H/D0)對dimensionless time
(tu0/D0)作圖。實驗結果可分成kinetic phase, spreading phase, relaxation phase,
asymptotic state 四部份來探討之。本研究並利用45 度俯角所得之液滴影像,比對液
滴影像側視圖,來觀察液滴頂端與內測凹陷行為。
The investigation on the droplet impact behavior has been proceeded for more than
several decades. Several different factors affecting the spreading behavior of the impinging
droplet have been reported, such as the initial impact velocity, droplet size, liquid viscosity,
and the surface property of solid.
Two major issues were studied in this work: surface effect and surfactant effect. In
the first part, water droplet impinges five different solid surfaces at a fix initial impact
velocity. The spreading behaviors were then investigated for these five solid surfaces with
different hydrophobicity. The equilibrium contacts of these five surfaces were
paraffin>Teflon>rough glass>quartz>clean glass. In the second part of this work, aqueous
droplets consisting of different surfactants with surface tension impinge the clean glass
surface. The spreading behaviors were then studied to check the effect of tension and
surfactant.
The experiments were performed by using a high speed CCD. 2905 images per
second were captured sequentially. The drop profiles were then obtained from the drop
images. Information D0 (initial diameter), u0 (impact velocity), t0 (impact image), θ
(contact angle), d (spreading diameter), H (apex height) were further resulted from the
drop profiles. The relationship between the dimensionless groups (spreading factor, d/D0;
apex factor, H/D0; time, tu0/D0) was investigated. The images captured from 45 degree top
view were also compared with the silhouette to detail the concavity of impinging droplet.
中文摘要..................................................................................... I
英文摘要..................................................................................... II
目錄目錄..................................................................................... III
表 目 錄..................................................................................... V
圖 目 錄..................................................................................... VI
第一章簡介.................................................................................. 1
1.1 高速攝影基本運用............................................................. 1
1.2 界面活性劑基本特性.......................................................... 2
1.3 質傳行為之描述................................................................. 3
1.4 潤濕現象(wetting)................................................................. 5
1.4.1 接觸角(contact angle)....................................................... 6
1.4.2 Young`s Equation ............................................................. 6
1.4.3 附著潤濕(adhesional Wetting) ............................................ 6
1.4.4 擴張潤濕(spreading Wetting) ............................................. 7
第二章文獻回顧........................................................................... 9
第三章實驗設備........................................................................... 12
3.1 主要儀器設備.................................................................... 12
3.2 其它儀器設備.................................................................... 15
3.3 儀器校正........................................................................... 16
3.4 實驗藥品........................................................................... 17
第四章研究方法........................................................................... 19
4.1 溶液之選定與配製............................................................. 19
4.1.1 實驗條件與溶液之選定................................................ 19
4.1.2 溶液之配製.................................................................. 22
4.2 實驗前置校正.................................................................... 23
4.2.1 平板校正..................................................................... 23
4.2.2 Needle 校正................................................................... 24
4.3 實驗操作............................................................................ 26
4.3.1 懸掛時間之決定........................................................... 27
4.3.2 如何決定D0 , t0 和V0 .................................................... 27
4.3.3 如何決定θ, h 和d ......................................................... 28
第五章實驗結果討論與建議事項................................................... 30
5.1 實驗結果............................................................................ 30
5.1.1 純水液滴撞擊於不同材質平板之結果........................... 33
5.1.2 界劑液滴撞擊於乾淨玻璃平板之結果........................... 37
5.1.3 無因次分析.................................................................. 43
5.1.4 液滴oscillation 之情況................................................... 45
5.2 討論................................................................................... 46
5.3 建議事項........................................................................... 46
參考文獻..................................................................................... 47
附錄(光碟) ................................................................................... 49
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