重粒子於泰勒庫頁提流場之偏好濃度與下沈速度實驗研究

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研究生：	陳賢圖 Xan-Tu Cheng
論文名稱：	重粒子於泰勒庫頁提流場之偏好濃度與下沈速度實驗研究
指導教授：	施聖洋 Shenqyang Shy
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 機械工程學系 Department of Mechanical Engineering
畢業學年度：	89
語文別：	中文
論文頁數：	83
中文關鍵詞：	泰勒庫頁提流場、偏好濃度、下沈速度
外文關鍵詞：	Taylor-Couette flow, preferential concentration
相關次數：	點閱：2 下載：0
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在重粒子下沈速度研究方面，使用兩組高速攝影系統，透過由內外兩圓柱反向旋轉下所產生的無特徵結構紊流場，採用玻璃粒子以質點影像速度量測技術(PIV)來量測重粒子於此流場之下沈速度(Vs)，初步結果發現，粒子平均下沈速度受紊流影響都會比其終端速度(Vt)來得大，且在St等於1附近時，下沈率有最大增加量，本實驗可能是第一個驗證紊流可增加粒子下沉速度之實驗。

Concerning the settling velocity of heavy particles in featureless turbulence which is generated by counter-rotating both cylinders, we employ glass particles and use the particle image velocimetry to measure mean particle settling velocities(Vs). Preliminary results show that values of Vs are greater than their corresponding terminal velocity (Vt) in still fluid.The increase of the settling rate reaches its maximum as .This experiment may be the first experiment to show that turbulence can increase the settling velocity of heavy particles.

摘要 ……………………………………………………………………………I
英文摘要………………………………………………………………………II
誌謝 …………………………………………………………………………III
目錄……………………………………………………………………………IV
圖表目錄………………………………………………………………………VI
符號說明………………………………………………………………………IX
第一章 前言……………………………………………………………………1
1 動機 …………………………………………………………………1
2 問題所在 ……………………………………………………………2
3 解決提案 ……………………………………………………………3
4 論文概要 ……………………………………………………………4
第二章 文獻回顧………………………………………………………………6
1 二相紊流之基本特性 ………………………………………………6
2 重粒子濃度場偏好性集聚與下沈速度之探討 ……………………8
3 泰勒-庫頁提流場之流場結構分析 ………………………………12
4 流體中運動顆粒的受力分析………………………………………13
5 質點終端速度與史托克斯數之評估………………………………16
6 質點影像測速儀之基本原理………………………………………18
第三章 實驗裝置與量測分析方法 …………………………………………23
1 泰勒-庫頁提流場之實驗裝置 ……………………………………23
2 流場流速的量測……………………………………………………24
2.1 微粒植入系統與流場量測粒子……………………………24
2.2 LDV之量測 …………………………………………………25
3 重粒子與實驗參數範圍的選擇……………………………………27
3.1 內圓柱旋轉部份……………………………………………28
3.2 內外圓柱反向旋轉部份……………………………………29
4 內圓柱旋轉流場(粒子偏好集聚觀測)……………………………29
4.1 雷射光頁位置與粒子植入系統……………………………30
4.2 影像擷取……………………………………………………31
5 內外圓柱反向旋轉流場(粒子下沈速度量測)……………………32
5.1 雷射光頁位置與粒子植入系統……………………………32
5.2 影像擷取……………………………………………………33
5.3 影像處理和分析……………………………………………34
6 誤差分析……………………………………………………………36
第四章 結果與討論 …………………………………………………………52
1 紊流強度之估算量測………………………………………………52
2 內圓柱旋轉…………………………………………………………53
2.1 粒子運動情形………………………………………………53
2.2 粒子偏好集聚現象…………………………………………55
3 內外圓柱反向旋轉…………………………………………………58
第五章 結論與未來工作 ……………………………………………………79
1 粒子偏好集聚之觀測………………………………………………79
2 粒子下沈速度之量測………………………………………………80
3 未來工作……………………………………………………………81
參考文獻………………………………………………………………………83

                                

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