水中微粒於聲波作用下之運動分析

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葉泰邑(Tai-Yi Yeh) 查詢紙本館藏

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機械工程學系

論文名稱

水中微粒於聲波作用下之運動分析

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摘要(中)

本論文主要針對在聲波的作用下，微粒在水中被捕獲在節點區域之討論。藉由施加頻率為2.51MHz及電壓為6Vpp之訊號於壓電元件使其振動並產生聲波，將微粒捕獲在聲束軸上之節點區域內，並透過移動平台移動使微粒脫離節點區域。藉此分析實驗結果中微粒受到聲輻射力作用下，在不同移動速度下掉落時之阻力，進而搭配理論公式分析出作用在微粒上的聲輻射力大小並對其進行比較。

摘要(英)

The discussion is focused on how the particles in the water are captured in the pressure node under the influence of sound waves. By applying a signal with 2.51 MHz and 6 Vpp to the piezoelectric element to vibrate and generate ultrasound in the water, the particle is captured in the pressure node on the sound beam axis, and it moved away from the pressure node through the mobile platform. Based on the experimental results, the particle dropped due to the drag force at different moving speeds. Finally, according to this measurement, the estimated acoustic radiation force on the particle is calculated.

關鍵字(中)

★ 超聲波
★ 聲輻射力
★ 微粒操控

關鍵字(英)

論文目次

摘要 i
Abstract ii
致謝 iii
圖目錄 vii
表目錄 x
一、緒論 1
1-1前言 1
1-2研究動機 1
1-3微粒操縱技術背景回顧 2
1-4聲波技術背景回顧 4
1-5聲學鑷子應用 11
1-6本文架構 11
二、基礎理論 12
2-1駐波理論 12
2-2聲場控制方程式 13
2-2-1狀態方程式 13
2-2-2連續性方程式 14
2-2-3動量方程式 14
2-2-4線性波動方程式 15
2-2-5聲輻射壓力 16
2-3聲場駐波理論 17
2-3-1聲輻射力 18
2-3-2側向輻射力 21
2-4斯托克斯黏滯阻力 21
2-5超聲波場中微粒運動的理論模型 22
三、實驗架構 25
3-1實驗流程 25
3-2聲阻抗匹配理論 27
3-3移動參數設計 28
3-4微粒及材料參數 30
四、實驗結果與討論 31
4-1實驗結果 31
4-1-1白色微粒 31
4-1-2粉色微粒 37
4-1-3兩種微粒結果比較 42
4-2微粒模型討論 44
4-2-1重力與浮力分析 46
4-2-2整個系統往下移動 47
4-2-3阻力分析 48
4-2-4實驗結果討論 49
五、結論與未來展望 51
5-1結論 51
5-2未來展望 51
參考文獻 52

參考文獻

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指導教授

陳世叡

審核日期

2020-7-16

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