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Student Number 89323085
Author Chia-Ju Kuan(官佳儒)
Author's Email Address s9323085@cc.ncu.edu.tw
Statistics This thesis had been viewed 1861 times. Download 2006 times.
Department Mechanical Engineering
Year 2001
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Air Bubble is Observed and Analyzed in the Pulse Electrochemical Machining
Date of Defense 2002-06-27
Page Count 67
Keyword
  • PECM
  • pulse frequency
  • Void Fraction
  • Abstract In the pulse electrochemical machining (PECM) a regular intermittent power is used to machine the product intermittently. However, the void fraction is the key factor for the product’s quality. In this experiment, a clear acrylic module is used to simulate the fluid field where the sodium chloride solution is chosen as the electrolyte. The pulse frequency, the electric field related parameters and thermal flow field related parameters are controlled to analyze the influence of parameters the void fraction.
    Results show that the thickness of the boubble which effects the void fraction would decreases as the pulse frequency decreases. On the other hands, the thickness of the bubble increases as the voltage increases, the electrolyte concentration increases or the electrolyte flow speed decreases. Therefore, by fixing the voltage and concentration and well controlling the electrolyte flow speed, a optimal condition between the pulse frequency and the electrolyte flow velocity can be achieved. In turn, the void fraction decreases and the product quality is thus improved effectively.
    Table of Content 摘要……………………………………………………………………Ⅰ
    英文摘要………………………………………………………………Ⅱ
    目錄……………………………………………………………………Ⅲ
    表目錄…………………………………………………………………Ⅵ
    圖目錄…………………………………………………………………Ⅶ
    符號說明………………………………………………………………Ⅸ
    第一章、緒論…………………………………………………………1
        1-1 前言……………………………………………………1
        1-2 文獻回顧………………………………………………2
        1-3 研究目的………………………………………………8
    第二章、實驗原理……………………………………………………10
        2-1法拉第定律、化學反應式及空隙分數………………10
          2-1-1法拉第定律10
          2-1-2化學反應式10
          2-1-3 空隙分數11
        2-2歐姆定律、電流密度、導電度與電流效率…………12
          2-2-1 歐姆定律12
          2-2-2 電流密度12
          2-2-3 導電度13
          2-2-4 電流效率13
        2-3狀態方程式……………………………………………14
        2-4電位之關係式…………………………………………14
        2-5電流之關係式…………………………………………15
        2-6導電度與濃度之關係…………………………………16
        2-7柏努力定律……………………………………………17
    第三章、實驗裝置及實驗步驟19
        3-1實驗設備………………………………………………19
          3-1-1模具……………………………………………19
          3-1-2流量計與流量積算指示器……………………19
          3-1-3電源供應器……………………………………20
          3-1-4 CCD、高倍率鏡頭……………………………20
          3-1-5 沉水馬達與攪拌器……………………………21
        3-2實驗材料………………………………………………21
          3-2-1 實驗試片………………………………………21
          3-2-2 電解液…………………………………………22
        3-3攝影與影像擷取處理系統……………………………23
          3-3-1影像拍攝器材與技巧…………………………23
          3-3-2 影像處理系統…………………………………23
        3-4實驗步驟與注意事項…………………………………24
          3-4-1 實驗步驟………………………………………24
          3-4-2 注意事項………………………………………25
    第四章、結果與討論…………………………………………………26
        4-1不同脈衝頻率下,氣泡層厚度之分析………………27
        4-2相同脈衝頻率下,氣泡層的厚度分析………………29
        4-3變更刀具形狀,氣泡層的厚度分析…………………31
        4-4 結果……………………………………………………32
    第五章、結論…………………………………………………………33
    第六章、參考文獻……………………………………………………35
    表………………………………………………………………………42
    圖………………………………………………………………………48
    附錄
      A 次損失之係數〈K〉…………………………………………….66
      B Similarity Theory……………………………………………67
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    Advisor
  • Lih-Wu Hourng(洪勵吾)
  • Files
  • 89323085.pdf
  • approve immediately
    Date of Submission 2002-07-14

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