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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 呂維明(Wei-Ming Lu) | |
| dc.contributor.author | Yu-Chang Lu | en |
| dc.contributor.author | 盧昱彰 | zh_TW |
| dc.date.accessioned | 2021-06-12T18:07:36Z | - |
| dc.date.available | 2011-01-02 | |
| dc.date.copyright | 2008-01-02 | |
| dc.date.issued | 2007 | |
| dc.date.submitted | 2007-12-24 | |
| dc.identifier.citation | Abarbanel, H.D.J. , 'Analysis of observed chaotic data', Springer (1995).
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27506 | - |
| dc.description.abstract | 本研究主要以固氣兩相流為對象，一方面採用實驗方法分別針對懸浮床與旋迴流管中兩系統之氣固兩相之流動現象與特性進行探討；另一方面，透過數值解析方法與實驗之結果做比較，確認數值解析之可行性與應用性。於單段懸浮床系統中，選用單粒徑2 mm之D族固體粒子（PS, millet, glass bead, zeolite）研究多孔板式懸浮床之形成機制與穩定操作範圍。經由實驗觀察，若達到一穩定氣泡懸浮床，其形成過程將歷經誘發期(induced stage)、第一成長期(first growing stage)、振盪淺床暫態期(oscillating shallow stage)、第二成長期(second growing stage)及穩定期(stable stage)等五個階段。此外，改變操作變數(氣體流速、固體粒子進料速率、開孔比、銳孔徑/粒徑比、粒子密度、孔板設計等)探討針對單段懸浮床穩定操作之影響並歸納出D族粒子之實際操作範圍。同時，對於操作變數進行無因次分析，且利用線性迴歸方式可求得操作條件與操作範圍之間的關係式。於數值解析中，以有限容積法求得氣相之速度分布，結合固體粒子之運動方程式計算兩相流之流動，所得結果與實驗數值相符，也確認此數值方法之可行性。
於旋迴流管系統中，以實驗與模擬方法針對單相氣體之流動進行研究，由實驗結果得知氣體切線速度隨著軸向方向而逐漸衰減，而其速度之高峰值則由靠壁端往軸心移動。此外，由於進口具有切線速度之故，於操作範圍內進口處有迴流區之產生，於模擬計算結果中也可確認此現象之存在。而在固氣兩相流方面，固體粒子在旋迴流管之流動，經由滯留時間分佈，可確定流態近似於栓流。而旋迴流管內固體粒子的平均滯留時間隨氣體流速與固體粒子濃度增加而降低。此外，氣固兩相在旋迴流管中的壓力損失僅為氣相在旋迴流管的45%左右，且含固體粒子時，壓力降並不受固體粒子大小或濃度的影響。最後，以熱傳實驗作為旋迴流管之應用，實驗之結果迴歸可得Nup=0.126Rep0.46(Fs/Fg)-0.53之關係式。 | zh_TW |
| dc.description.abstract | This thesis is mainly focused on the solid-gas two-phase flow and experimentally discussed with flow characteristics and flow phenomena in two systems (suspension bed & swirling flow tube), and proved the validation of the simulation results with experimental data. For the system of single-stage suspension bed, Geldart D group particles(PS,millet,glass bead,zeolite)with mono size (dp=2 mm) were used to study the mechanism of formation, stable operation range and characteristics of suspension beds. Given the typical formation of a stable bubbling bed in the experiments, total five stages will be observed here and defined here: the induced, the first growing, the oscillating shallow bed, the second growing and the final stable stage. The influences of the operation variables on the formation of single stage suspension beds were discussed separately in the study including of the air velocity through the hole (Uo/Ut), the particle feeding rate (Fv’), the opening ratio of the plate (m), the ratio of the diameter of the hole to the diameter of the particle (do/dp) , the density of particles and design of perforated plate. In addition, the correlation between operation variables and operating range was also investigated using dimensionless analysis and regression equation. Compared with experiments, the numerical analysis is calculated by finite volume method (FVM) for velocity distribution of gas combined with the motion equation of particles. Sequentially the results of simulation are well agreed with experimental results and prove its application.
On the other hand, for investigating the solid-gas two-phase in a swirling flow tube, the single gas phase was studied at first to understand the flow pattern and flow characteristics. From the experiments, the results are shown that the decay of tangential velocity along axial distance and the maximum of velocity was moved from the wall to the center of tube. It is caused recirculation zone near the inlet zone due to the swirling velocity, and the results of simulation also show the phenomena. Meanwhile, in the case of PS particle, the flow pattern in the swirling flow system can be seen as a plug flow according the residence time distribution and the residence time distribution of particles decreases as the gas velocity and loading of particles increase. Pressure drop of solid-gas two phase mixtures was found approximately 55% less than that of only air flows through the system. At last, the heat transfer between gas and particles was taking as a application of swirling flow tube, and the relationship between Nup and Rep was obtained as Nup=0.126Rep0.46(Fs/Fg)-0.53. | en |
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| dc.description.tableofcontents | 誌 謝 …………………………………………………………………… I
中文摘要 …………………………………………………………………… Ⅲ 英文摘要 …………………………………………………………………… V 目 錄 …………………………………………………………………… VII 圖 目 錄 …………………………………………………………………… XI 表 目 錄 …………………………………………………………………… XV 第一章 緒論…………………………………………………………………. 1 第二章 文獻回顧…………………………………………………………... 5 2-1 懸浮床系統-多段式流體化………………………............... 6 2-1-1 多段流體化床之操作特性….…………………........... 6 2-1-2 懸浮床粒子於多孔板上之掉落機制……………… 8 2-1-3 懸浮床粒子的排放速率………..................................... 11 2-1-4 多孔板式懸浮床的形成過程與機制………. ……… 13 2-1-5 流體化床之壓降預測…………………………………. 15 2-1-6 多段式流體化床的操作範圍………………………... 18 2-1-7 流體化床中的壓力擾動……………………………… 21 2-2 粒子運動模擬之方法……………………………………….. 22 2-3 旋迴流管系統………………………………………………… 26 2-3-1 氣相旋迴流系統……………………………………….. 26 2-3-1-1 Ranque-Hilsch旋迴流管…………………… 26 2-3-1-2 旋迴流管之速度與壓力分布…………...... 28 2-3-1-3旋迴流速度衰退分析………………………. 29 2-3-1-4 理論分析與數值模擬………………………. 29 2-3-2 氣固兩相旋迴流之實驗與理論分析………………. 31 2-3-3 旋風分離器之流場分布與效率…………………….. 32 第三章 多孔板式懸浮床之形成機制、穩定操作範圍及數學模擬……………………………………………………………. 35 3-1 實驗裝置與方法……..…………………………………… 35 3-2 多孔板式懸浮床之形成過程與穩定操作………… 42 3-2-1 多孔板式懸浮床之形成過程………………….. 42 3-2-2 多孔板式懸浮床的粒子掉落機制…………… 47 3-2-3 多孔板式懸浮床的型態與特性………………. 49 3-2-4 操作變數對單段多孔板式懸浮床形成及操作範圍之影響……………………………………. 62 3-2-4-1 固體粒子進料速率對系統操作之影響…………………………………………. 62 3-2-4-2 氣體流速對系統操作之影響……… 66 3-2-4-3 開孔比對系統操作之影響…………. 72 3-2-4-4 銳孔徑�粒徑比(do/dp)對系統操作之影響…………………………………... 76 3-2-4-5 粒子密度對系統操作之影響……… 79 3-2-4-6 孔板設計對系統操作之影響……… 79 3-2-4-7 粒徑混合效應對系統操作之影響 92 3-2-5 D類粒子的穩定操作範圍及條件……………. 94 3-2-6 結論……………………………………………………… 98 3-3 單段多孔板式懸浮床之模擬與實驗比較............. 98 3-3-1 單段多孔板式懸浮床粒子運動之模擬……. 98 3-2-1-1 流體流過多孔板式懸浮床之流態解析--有限容積……………………… 99 3-2-1-2 多孔板式懸浮床內粒子之運動模擬---離散元素法……………………. 103 3-3-2 電腦模擬計算程序……………………………… 109 3-3-3 模擬與實驗結果之比較…………………………. 111 3-2-3-1 流體流過多孔板之流態分析………… 111 3-2-3-2 懸浮床之形成過程與壓降變化……… 116 3-2-3-3 單段多孔板式懸浮床的粒子滯留量 116 3-3-4 結論………………………………………………….. 117 第四章 氣固兩相流體於旋迴流管中之流動特性………………… 121 4-1 簡介………………………………………………………... 121 4-2 實驗裝置與方法…………………………………………. 121 4-3 數值模擬理論與解析方法……………………………… 133 4-3-1 紊流閉合模式………………………………………. 133 4-3-2 二相流紊流閉合模式………………………………. 137 4-3-3 壁函數……………………………………………….. 139 4-3-4 網格設計…………………………………………….. 143 4-3-5 邊界條件與初始條件設定………………………… 144 4-4 單相實驗結果與數值計算之比較……………………… 145 4-5 固體粒子在旋迴流管中的流態………………………… 153 4-6 壓力降……………………………………………………... 156 4-7 固體粒子的平均滯留時間……………………………… 160 4-8 結論………………………………………………………... 163 第五章 旋迴流管之熱傳研究……………………………………….. 167 5-1 簡介………………………………………………………... 167 5-2 實驗裝置與實驗方法……………………………………. 167 5-3 旋迴流管中氣-固間的熱傳……………………………... 168 5-4 結論………………………………………………………... 173 第六章 總結…………………………………………………………… 175 符號說明 ...…………………………………………………………………. 177 參考文獻 ...…………………………………………………………………. 181 中英對照 …………………………………………………………………… 189 附錄 附錄A：數位式壓力紀錄器校正曲線圖 附錄B：粒子終端速度之計算 附錄C：實驗粒子的最小流體化速度 附錄D：銳孔流量計之校正曲線(do/D=0.45) 193 195 197 199 | |
| dc.language.iso | zh-TW | |
| dc.subject | 數值模擬 | zh_TW |
| dc.subject | 固氣兩相流 | zh_TW |
| dc.subject | 旋迴流管 | zh_TW |
| dc.subject | 懸浮床 | zh_TW |
| dc.subject | numerical simulation | en |
| dc.subject | solid-gas two phase flow | en |
| dc.subject | swirling flow | en |
| dc.subject | suspension bed | en |
| dc.title | 固氣兩相流在懸浮床與旋迴流管之研究 | zh_TW |
| dc.title | A Study on Solid-Gas Two-Phase Flow in Suspension Bed
and Swirling Flow Tube | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 96-1 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 戴怡德(Clifford Yi-Der Tai),王大銘(Da-Ming Wang),童國倫(Kuo-lun Tung),黃國楨(Kuo-Jen Hwang) | |
| dc.subject.keyword | 懸浮床,旋迴流管,固氣兩相流,數值模擬, | zh_TW |
| dc.subject.keyword | suspension bed,swirling flow,solid-gas two phase flow,numerical simulation, | en |
| dc.relation.page | 188 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2007-12-24 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 化學工程學研究所 | zh_TW |
| 顯示於系所單位： | 化學工程學系 | |
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