剪力槽中粒子混合機制研究

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姓名

陳俊中(Chun-Chung Chen) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

剪力槽中粒子混合機制研究
(Granular mixing in the shear cell)

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摘要(中)

在剪力槽粒子混合實驗中，本實驗利用影像分析方法量測兩種不同顏色粒子之混合層隨時間的變化，並且計算出粒子擴散係數、粒子溫度以及剪率種種數據相互比較。其中，粒子溫度搭配擴散方程式可計算出混合層中的濃度變化，進而推測理論上混合層隨時間變化之關係，並且與實驗做比較。在本文中，有效擴散係數Deff是一個重要的參數，代表流場混合快慢的指標，而這個參數也與底盤轉速、平均粒子溫度與剪率做比較，觀察其趨勢的變化。本實驗發現底盤轉速，也就是剪力槽系統所供應的能量對粒子的混合有很大的影響，另外，在混合初始時，混合層隨時間變化較明顯。而在參數的比較方面，發現當轉速增加時，有效擴散係數與平均粒子溫度以及剪率都呈現正相關。

摘要(英)

The experiments of particle mixing were performed in a shear cell device with five different bottom wall velocities. The glass spheres with a mean diameter of 2 mm were used as granular materials. The mixing processes of the granular materials were recorded by a high-speed camera. The image processing technology and particle tracking method were employed to analysis the granular mixing and the diffusion of particles. In this paper, the effective diffusion coefficient is an important parameter. The effective diffusion coefficients were increase with the increase of the bottom wall velocities, average granular temperatures, and shear rates near the top wall. The FDM was also used to calculate the concentration profiles that were compared to the experiment data.

關鍵字(中)

★ 粒子流
★ 混合

關鍵字(英)

★ granular
★ mixing

論文目次

摘要…………………………………………………..……..……i
目錄……………………………………………………………ii
附表目錄……………………………………….……………..…v
附圖目錄……………………………………………………..…vi
符號說明……………………………………………………..…ix
第一章簡介...........................................…..............................…1
1.1 粒子流簡介....................................……....................…1
1.2 顆粒體混合現象之介紹....................….................…...2
1.3 剪力流的研究歷史…...............…..........................…...4
1.4 研究方向與架構...........................………..............…...6
第二章實驗方法與原理………………...……………………..8
2.1 實驗設備...................................................................….8
一、剪力槽裝置………………………………………8
二、顆粒體……………...………………………….…10
三、觀測及量測儀器…………………………..……...11
2.2 實驗原理......................................................................13
一、影像處理與混合層厚度之分析方法……………13
二、粒子溫度的概念…………………………………16
三、自我擴散理論…………………………………...17
四、混合層內的擴散方程式…………………...……18
2.3 實驗步驟.........................…………………….……...….21
混合層厚度的量測……….…...……………………….21
二、擴散係數的量測…………………………………23
2.4 誤差校正..........................…………….…………….......25
一、誤差來源……………………………………….25
二、誤差校正(Calibration)…………………………….26
第三章結果與討論................................................……….......28
3.1 混合層隨時間變化關係圖…………………………….27
3.2 混合層內濃度之理論分析與計算……………………....30
3.3 混合層內之有效擴散係數、擴散速率、平均粒子溫度與
剪率………………………………………...……..….….32
3.4 混合層隨時間變化之實驗數據與理論計算之比較....36
第四章結論...................................................……….......38
參考文獻...........................................................................40

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指導教授

蕭述三(Shu-San Hsiau)

審核日期

2003-6-26

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