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Student Number 973203054
Author Chun-Hui Wu(吳俊輝)
Author's Email Address 973203054@cc.ncu.edu.tw
Statistics This thesis had been viewed 581 times. Download 201 times.
Department Mechanical Engineering
Year 2009
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title An investgation of the flow behaviour of non-spherical particles in vibrating beds.
Date of Defense 2010-07-26
Page Count 111
Keyword
  • Improved PTV
  • Non-spherical particulate system
  • Transport property
  • Vibrated bed
  • Vibration conditions
  • Abstract  This thesis investigates the flow behaviour of non-spherical particles in vibrating beds, studies the influence of vibration conditions on the flow behaviours and compares the flow behaviour between spherical and non-spherical particles. At the preliminary tests, paired POM particles (one of the non-spherical particles), made by gluing two single POM beads, were studied. The improved Particle Tracking Velocimetry (PTV) was employed to measure the translational and rotational velocities of these non-spherical particles in a vibrating bed. The transport properties of the paired POM particles in a vibrated bed, such as local average velocities, local fluctuation velocities, granular temperatures, fluctuation velocity distributions, self-diffusion coefficients and dimensionless convection flow rates, were evaluated from the experimental results and discussed. The study has shown that the improved PTV technique has the ability to measure more accurately the velocity field of non-spherical particulate systems and that the particle rotation can play a significant role in a vibrated granular bed.
     The dimensionless convection flow rates and global granular temperatures in the non-spherical granular vibrated bed increase with the increase of the vibration acceleration and velocity. The dimensionless convection flow rates also increase with increasing the global granular temperatures. The dimensionless convection flow rates and global granular temperatures in a spherical granular system are larger than those in a non-spherical granular system since the POM paired particles studied here induce a particle inter-locking than spherical particles.
    Table of Content 摘要i
    Abstractiii
    目錄v
    附表目錄vii
    附圖目錄viii
    符號說明xv
    第一章緒論1
      1.1 顆粒流1
      1.2 顆粒體在振動床中之流動行為2
       1.2.1 垂直振動床內的迴流現象3
       1.2.2 振動床內運動現象之轉變6
      1.3 研究動機與目的7
    第二章 實驗設備、量測技術與實驗步驟9
      2.1 實驗設備9
      2.2 量測技術14
       2.2.1 改良式粒子追蹤影像處理技術14
       2.2.2 影像分析流程17
      2.3 實驗步驟18
    第三章 振動顆粒床之輸送性質21
      3.1 局部平均速度及局部擾動速度21
      3.2 局部粒子溫度22
      3.3 擾動速度分佈22
      3.4 擴散係數23
      3.5 無因次質量流率24
      3.6 整體粒子溫度與整體平均動能25
    第四章 實驗結果與討論27
      4.1 非球形顆粒體在振動床中之迴流行為27
      4.2 振動條件對非球形顆粒體輸送性質的影響31
      4.3 球形與雙球形顆粒體在振動床中流動行為之比較42
    第五章 結論46
    參考文獻48
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    Advisor
  • Shu-San Hsiau(蕭述三)
  • Files
  • 973203054.pdf
  • approve immediately
    Date of Submission 2010-08-17

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