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系統識別號 U0026-0812200915364595
論文名稱(中文) 共振式聲化學反應器之 分析與實驗
論文名稱(英文) Analysis and Experiment of Resonant Sonochemical Cell
校院名稱 成功大學
系所名稱(中) 機械工程學系碩博士班
系所名稱(英) Department of Mechanical Engineering
學年度 97
學期 2
出版年 98
研究生(中文) 姚明宗
研究生(英文) Ming-Tzung Yao
學號 N1696113
學位類別 碩士
語文別 中文
論文頁數 88頁
口試委員 口試委員-李永春
口試委員-楊天祥
指導教授-王逸君
中文關鍵字 聲化學反應器  空蝕汽泡  變幅桿  高強度超音波系統 
英文關鍵字 High intensity ultrasonic system  Horn  Cavitation bubble  Sonochemical system 
學科別分類
中文摘要 聲化學是經由超音波在液體中產生空蝕汽泡,藉由空蝕汽泡在崩裂時所產生的震波、高速噴流及瞬間的高壓、高溫及快速冷卻等條件下所產生的化學反應。一般的高強度超音波聲化學反應器,其空蝕汽泡皆發生在壓電換能器變幅桿的末端,因此造成變幅桿表面的侵蝕,導致樣本污染、系統頻率失調及設備壽命降低等缺失。
  本研究利用COMSOL有限元素分析軟體,對壓電換能器、變幅杆結構及聲化學反應室進行耦合分析,建立完整的超音波聲化學反應器分析設計工具。為了避免變幅桿端面之聲壓振幅過大造成空蝕,本研究採用截面積放大之變幅桿設計,配合改變反應室容器之尺寸及變幅桿浸潤深度,找到聲壓振幅最大值遠離變幅桿端面的系統共振模態。實驗上則依據分析結果製作不同半徑之反應室容器,證實了分析中所見到之各個系統共振模態確實可以空蝕汽泡場的型態存在。換言之,只要設計得當,可利用整體系統之共振,產生遠離變幅桿末端的空蝕汽泡場,達到改進傳統聲化學反應器缺失之目的。
英文摘要 Sonochemical effects of high intensity ultrasound come mainly from acoustic cavitation. Cavitation bubble collapse in liquid is so violent that very high local pressure and temperature, combined with extraordinarily cooling, provide a unique environment for driving chemical reactions under extreme conditions. In general, high power ultrasonic sonochemical systems utilize a metal horn to amplify the intensity of the ultrasound generated from a piezoelectric transducer. As a result, cavitation bubbles form near the horn tip, causing severe erosion of the horn, contamination of the sample, and degeneration of the system resonance.
In the study, the COMSOL finite element software is used first to construct a tool for designing and analyzing the ultrasonic sonochemical system. Different physical modules, namely piezoelectric module, structural module, and acoustic module, are coupled together. In order to eliminate the cavitation erosion, an enlarged horn is designed for reducing the energy density of the ultrasound transmitted to the sonochemical cell. Numerical results show that an ideal resonant mode can be found by adjusting the immersed depth of the horn and the radius of the sonochemical cell so that the greatest amplitude of the acoustic pressure is located away from the horn tip. Experimentally, it is confirmed that the various resonant modes observed in the numerical analysis indeed exist. The most important finding of the present study is that focused cavitation field can be generated away from the horn by careful design of the components of the resonant sonochemical system.
論文目次 目錄
摘要 I
Abstract II
致謝 IV
目錄 V
圖目錄 VIII
表目錄 XIII
符號說明 XIV
第一章 導論 1
1-1前言 1
1-2文獻回顧 3
1-3研究動機與目的 7
1-4本文架構 8
第二章 超音波聲化學系統 9
2-1壓電效應 10
2-2超音波原理 12
2-3空蝕現象與聲化學 16
第三章 超音波系統 21
3-1超音波系統架構 21
3-1-1變幅桿的設計 22
3-1-2藍杰文換能器 25
3-2數值模擬 26
3-2-1變幅桿節點與共振頻率模擬 26
3-2-2壓電換能器結合變幅桿的共振分析 29
3-3超音波系統量測實驗 32
3-3-1高功率下的量測實驗 32
3-3-2 雷射位移感測計之位移量測 36
3-3-3結構阻尼之分析與設定 43
第四章 聲化學反應室之分析與實驗 50
4-1聲化學反應室與超音波系統之耦合分析 50
4-1-1軸對稱反應室之模擬 52
4-2聲化學反應室與超音波系統之耦合實驗 57
4-2-1軸對稱容器之實驗 57
4-2-2容器形狀及對稱性對系統的影響 64
4-3共振聲場之模擬分析與實驗比對 68
4-3-1共振聲場的模擬 68
4-3-2共振聲場的實驗 74
第五章 結論與未來展望 80
5-1結論 80
5-2未來展望 82
參考文獻 83
附錄A  平均功率與聲強的計算 85
參考文獻 參考文獻
[1]. 馬振基主編,”奈米材料科技原理與應用”,全華科技圖書,台北,民國92年。
[2]. K.S.Suslick,”The chemical effects of ultrasound”Scientific American”,Vol.2,pp.80-86,1989
[3]. W.T. Richards and A.L.Loomis,“The chemical effects of high frequency sound waves l.A Preliminary survey.” J. Am. Chem. Soc., Vol. 49, No. 12,pp.3068-3100, 1927
[4]. T.G. Leighton,“Bubble population phenomena in acoustic cavitation.” Ultrasonics Sonochemistry,Vol 2,Oct. 1994.
[5]. S.W. Dähnke and F.J.Keil,“Modeling of linear pressure fields in sonochemical reactors considering an inhomogeneous density distribution of cavitation bubbles.”,Chemical Engineering Science, Vol. 54, pp. 2865-2872, 1999.
[6]. P.R.Birkin,T.G.Leighton,J.F.Power,and M.D.Simpson,“Experimental and theoretical charecterixation of sonochemical cells. Part 1. Cylindrical Reactors and their use to calculate the speed of sound in aqueous solutions.”,J.Phys.Chem.A,pp.306-320, 2002.
[7]. P.R.Birkin,J.F.Power,M.L.Vincotte,and T.G.Leighton,“A 1kHz resolution frequency study of a variety of sonochemical process .”Phys. Chem. Chem. Phys,Vol.5 pp.4170-4174, 2003.
[8]. Y.Matsumoto, J.S.Allen,S.Yoshizawa,T.Ikeda,and Y.Kaneko,“Medical ultrasound with microbubbles.”, Experimental Thermal and Fluid Science, Vol. 29, pp. 255–263, 2005
[9]. J. Klíma, A.Frias-Ferrer, J.Gonza′lez-Garcı′a, J.Ludvı′k, and J.Iniesta,“Optimisation of 20 kHz conoreactor geometry on the basis of numerical smulation of local ultrasonic intensity and qualitative comparison with experimental results.”,Ultrasonics Sonochemistry , Vol. 14, pp. 19–28, 2006.
[10].謝玉宸,"超音波聲化學反應器之共振模態分析與實驗”,國立成功大學機械工程研究所碩士論文, 民國97年。
[11].黃繼模,”參數型超音波空蝕系統應用於聲化奈米製程”,國立成功大學機械工程研究所博士班資格考論文計畫書,民國97年
[12].T.G.Leighton,“What is ultrasound?”,Progress in Biophysics and Molecular Biology, Vol. 93, pp. 3-83, 2007.
[13].L.E.Kinsler,A.R.Frey,A.B,Coppens,and J,V.Sander,”Fundamentals of Acoustic”,3rd edition,John Wiley&Sons,1982.
[14].T.J.Mason and J.P.Lorimer.”Applied Sonochemistry. The Uses of Power Ultrasound in Chemistry and Processing”,Wiley-VCH,2002.
[15].B.Toukoniitty,J-P.Mikkola,D.Yu.Murzin,and T.Salmi,”Utilization of electromagnetic and acoustic irradiation in enhancing heterogeneous catalytic reactions”,General 279 p1-p22,2005.
[16].覃兆海 陳馥衡,謝毓元“超聲波在有機合成中的應用”化學進展1998年第1期 No.1, March 1998.
[17]. Apfel RE, Holland CK,“Gauging the likelihood of cavitation from    short-pulse, low-duty cycle diagnostic ultrasound,” Ultrasound in Medicine and Biology 17(2), 179-185 ,1991.
[18].賴耿陽,“超音波工學理論實務”,復漢出版社, 民國90年3月.
[19].溫傅亮等人”藍杰文振動子共振腔體設計與動態行為之研究”第十三屆中華民國振動與噪音學術研討會,民國94年
[20].COMSOL“Structural Mechanics Module User’s Guide.”COMSOL.Aug. 2006.
[21].林憲陽,”精密位移量測實習”,德霖技術學院機械工程系。
[22].P.Bourbe,”DFT(Discrete Fourier Transform)FFT(Fast Fourier Transform)”,June 1993
[23].J.L.Pons,H.Rodríguez, E. Rocon, J.F. Fernández, M. Villegas,”Practical consideration of shear strain correction factor and Rayleighdamping in models of piezoelectric transducers”, Sensors and Actuators A 115 (2004) 202–208
[24].COMSOL “Acoustics Module User’s Guide. ” COMSOL.Aug. 2006.
[25].COMSOL “Acoustics Module Model Library . ” COMSOL.Sep. 2006.
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