請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/60170完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 周逸儒(Yi-Ju Chou) | |
| dc.contributor.author | Wei-Hung Lin | en |
| dc.contributor.author | 林韋宏 | zh_TW |
| dc.date.accessioned | 2021-06-16T10:00:44Z | - |
| dc.date.available | 2017-02-08 | |
| dc.date.copyright | 2017-02-08 | |
| dc.date.issued | 2016 | |
| dc.date.submitted | 2016-11-14 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/60170 | - |
| dc.description.abstract | 本研究致力於開發能應用在通道流場之高濃度的固液二相流之三維數值模式，而此模型中，固相以及液相所引用的方程式皆為適用於連續體之廣義納維爾-史托克方程式，因此兩相皆在尤拉網格上做解析。由於在計算靠近底床之流場時，其流場現象非常紊亂，因此在流體的計算上，我們採用了大渦流模式來解紊流流場，並且以混合動力模型來處理次網格尺度的流場。在高濃度的流場中，由於史托克阻力模型以不再適用，因此採用一套可描述在高濃度流場的阻力模型。在顆粒相的碰撞機制則是根據粒子流動力論來處理；而泥沙沉積的部份則是引用了的顆粒摩擦正向應力，來支撐掉落的泥沙。在驗證模型的過程，首先令此組泥沙自由的沉降，並且在沉積一層底床後，開始進行薄層流的驗證。而驗證的結果發現，本研究開發的模型能準確的捕抓到不同希爾參數下薄層流之泥沙濃度的分布。採用這樣的尤拉-尤拉數值模式，對於在高濃度的流場中能比尤拉-拉格朗日數值模式有效的節省計算的資源。 | zh_TW |
| dc.description.abstract | We develop a three-dimensional Eulerian-Eulerian computational tool to model dense solid-liquid two-phase flow in the channel. By treating the solid phase as a continuum, a more computationally efficient simulation compared to the Eulerian-Lagrangian model can be achieved. The Large-eddy simulation (LES) is introduced to solve the turbulent flow, which employs a dynamic mixed model to deal with the sub-grid-scale field. As the Stokes drag is only suitable for the dilute case, the drag model for the dense suspension is employed. The collisional mechanism of particles is modeled based on the kinetic theory of granular flow, and the sediment frictional normal stress model isadopted to simulate the deposition of sediment. The model is validated with the experimental data of sheet flow. The model validation shows that our model is able to precisely replicate the mean sediment concentration profiles under different erosion criteria. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T10:00:44Z (GMT). No. of bitstreams: 1 ntu-105-R03543075-1.pdf: 3718297 bytes, checksum: 470b8ce8063e463caf5744b87bdb7955 (MD5) Previous issue date: 2016 | en |
| dc.description.tableofcontents | 誌謝 i
中文摘要 ii ABSTRACT iii 總目錄 iv 圖目錄 vi 表目錄 viii Chapter 1 緒論 1 1.1 研究動機 1 1.2 文獻回顧 3 1.3 研究方法 9 Chapter 2 理論與數值模式 11 2.1 二流體法 12 2.2 大渦流模式 13 2.3 統御方程式 14 2.3.1 阻力模型 18 2.3.2 顆粒相應力模型 20 2.3.3 方程式耦合 26 2.4 粒子溫度傳輸方程式 29 2.5 數值離散化計算 31 2.5.1 統御方程式離散化 32 2.5.2 粒子溫度傳輸方程式離散化 35 2.6 模式介紹 38 Chapter 3 數值模式之驗證 39 3.1 模擬配置 39 3.2 泥沙自由沉降 41 3.2.1 阻力模型對沉降速度之影響 41 3.2.2 沉降過程 45 3.2.3 堆積作用 47 3.3 薄層流之驗證 48 3.3.1 薄層流實驗驗證 49 3.3.2 不同顆粒碰撞黏滯係數模型之影響 51 3.3.3 阻力模型之影響 55 3.3.4 摩擦黏滯係數之影響 58 3.4 粒子溫度之探討 62 3.5 薄層流產生之原因 64 Chapter 4 結論與未來工作 69 4.1 結果與討論 69 4.2 未來工作 72 參考文獻 73 | |
| dc.language.iso | zh-TW | |
| dc.subject | 大渦流模式 | zh_TW |
| dc.subject | 尤拉-尤拉法 | zh_TW |
| dc.subject | 固液二相流 | zh_TW |
| dc.subject | 粒子流動力論 | zh_TW |
| dc.subject | 薄層流 | zh_TW |
| dc.subject | granular flow | en |
| dc.subject | LES | en |
| dc.subject | Solid-Liquid two-phase flow | en |
| dc.subject | sheet flow | en |
| dc.subject | Euler-Euler method | en |
| dc.title | 剪力下液化床行為的兩相流數值模擬 | zh_TW |
| dc.title | Euler-Euler simulation of fluidized bed under the shear | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 105-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 牛仰堯(Yang-Yao Niu),楊馥菱(Fu-Ling Yang) | |
| dc.subject.keyword | 固液二相流,大渦流模式,薄層流,粒子流動力論,尤拉-尤拉法, | zh_TW |
| dc.subject.keyword | Solid-Liquid two-phase flow,LES,sheet flow,granular flow,Euler-Euler method, | en |
| dc.relation.page | 80 | |
| dc.identifier.doi | 10.6342/NTU201603742 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2016-11-15 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 應用力學研究所 | zh_TW |
| 顯示於系所單位： | 應用力學研究所 | |
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