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研究生:黃奇鍊
研究生(外文):Chi-LianHuang
論文名稱:二氧化碳氣泡粒徑在水中衰減特性之實驗研究
論文名稱(外文):Experimental study of size reduction of carbon dioxide bubble in water
指導教授:黃清哲黃清哲引用關係
指導教授(外文):Ching-Je Huang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:水利及海洋工程學系碩博士班
學門:工程學門
學類:河海工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:49
中文關鍵詞:氣泡粒徑影像法聲學法衰減
外文關鍵詞:bubble sizephotographic methodacoustic methodreduction
相關次數:
  • 被引用被引用:2
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  • 下載下載:14
  • 收藏至我的研究室書目清單書目收藏:0
本文主旨係以實驗方法探討二氧化碳氣泡衰減特性,藉由影像量測技術,以高速攝影機拍攝水中氣泡變化,進一步影像處理分析,可計算出氣泡之粒徑,同時利用水下麥克風收集氣泡噪音,經由快速傅立葉轉換分析後,由理論推導的氣泡大小。本實驗在成功大學水利及海洋工程學系光纖感測及聲學實驗室玻璃實驗水槽進行兩項實驗:實驗一為用針頭釋出二氧化碳單一氣泡,以影像法計算氣泡粒徑衰減程度;實驗二為用可變孔徑氣幕帶釋出氣泡幕,以影像及水下麥克風同步量測訊號,將結果加以比對探討。實驗結果發現,二氧化碳氣泡之粒徑在水中衰減程度除了從影像法得到明顯的衰減外,在溫度及壓力相近的環境下,氣泡粒徑衰減率會隨著氣泡粒徑越大衰減率則越小,甚至氣泡的衰減率會有負值之結果。另外,聲音訊號與影像資料經比對結果,在氣泡群中由於氣泡會互相撞擊、結合及分裂,所以無法在頻域圖中得到水中實際整體氣泡大小與數量。本研究以影像法及聲學法同時進行觀測,以影像來輔助聲學法判別氣泡大小,使其更具有說服力。本研究除了瞭解二氧化碳衰減特性,未來可以應用於軍事上船艦用氣幕帶之替代氣體等議題。
A series of images of bubbles were taken by a high-speed camera with the image process method to estimate the size reduction of carbon dioxide bubbles in water. An acoustic technique (passive method) with a hydrophone was simultaneously employed to measure the bubble signal spectrum by Fast Fourier Transform (FFT). Experiments were carried out in a glass water tank in the Department of Hydraulic and Ocean Engineering, NCKU. The first experiment is to release a single CO2 bubble with the needle at the bottom of the tank, and the reduction of the bubble size was measured with the photographic method during its rising process. In the second experiment, a bubble screen belt with the same orifice (0.3 mm in diameter) was used to generate the CO2 bubble cloud which was synchronously measured by both photographic and acoustic methods to estimate the bubble population. The result of the first experiment demonstrates that the CO2 bubble became to shrink when it rises to the water surface. This result is not agree with previous investigations to verify the carbon dioxide is soluble in the liquid. In addition, the acoustic method seems difficult to calculate the magnitude of bubble cloud since bubbles will crash coalesce, and divide when they rise to the water surface. However, the bubble signal spectrum measured by the acoustic method indicates the bubble sizes in the tank and they were also confirmed by the photographic method.
中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
圖目錄 vi
表目錄 vii
符號表 viii
第一章 緒論 1
1-1前言 1
1-2前人研究 2
1-2.1氣泡量測方法 2
1-2.2二氧化碳氣泡相關研究 5
1-3本文架構 6
第二章 基本理論 7
2-1影像分析原理 7
2-2氣泡運動方程式 10
2-3單一氣泡振動共振頻率 13
第三章 實驗設備及研究方法 20
3-1實驗設備 20
3-2儀器介紹 22
3-3研究方法 29
3-3.1影像法 30
3-3.2聲學法 32
第四章 實驗分析結果與討論 33
4-1 單一氣泡量測結果 33
4-2氣泡幕聲學與影像探討 39
第五章 結論與建議 45
5-1 結論 45
5-2 建議 46
參考文獻 47

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