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系統識別號 U0002-1507201614315500
中文論文名稱 分層異重流的實驗研究
英文論文名稱 An experimental study of density-stratified gravity currents
校院名稱 淡江大學
系所名稱(中) 水資源及環境工程學系碩士班
系所名稱(英) Department of Water Resources and Environmental Engineering
學年度 104
學期 2
出版年 105
研究生中文姓名 楊承羲
研究生英文姓名 Cheng-Xi Yang
學號 603480194
學位類別 碩士
語文別 中文
口試日期 2016-06-22
論文頁數 45頁
口試委員 指導教授-許中杰
共同指導教授-戴璽恆
委員-盧博堅
委員-李政賢
委員-戴璽恆
中文關鍵字 異重流  分層 
英文關鍵字 Gravity currents  stratification 
學科別分類 學科別應用科學環境工程
中文摘要 本文探討分層異重流的實驗。為兩種有密度差異的分層流體流動進另一個密度比分層流體相對較小的背景流體中的實驗。主要目的在於透過理論解析以及實驗系統性的探討分層異重流於慣性區段的影響。於定量與定性分析過程中,了解分層異重流在運動中所產生的混合及分離的過程。於慣性區段的異重流運動型態將遵守3/2 指數關係,並且與密度比(rho∗) 以及重力比(B∗) 相關。透過觀察分層異重流於慣性區段之福祿數 (FI) 變化、rho∗與B∗之關聯性來了解流動型態的特性。首先從實驗之分析結果得知,當密度均勻之均質異重流體進入背景流體其慣性區段的FI值約為1.33,其值皆大於非均質之分層異重流的例子。當初始分層條件為弱分層情形時(0.5分層的情形之間,當重力比值較大時(B∗→1)會發生以上層流體為主導的形流動型態;若是重力比值較小時 (B∗→0) 會發生以下層流體為主導的形流動型態。藉由慣性區段的FI值、rho∗以及重力比B∗於幫助了解分層異重流的運動型態和特徵。
英文摘要 This paper examines experiment of density-stratified gravity currents. There are two kinds of fluid of density-stratified difference penetrating into ambient fluid. The main objective focus on investigating the influence of density-stratification on the gravity currents is systematically explored in the inertial phase through the theoretical and experimental studies. The mixing and discrete processes are represented produced by density-stratified buoyancy source in qualitative and quantitative method. In the inertial phase of propagation, the flow pattern of gravity current follows the 3/2 power relationship related with the Froude number, density difference ratio (rho∗) and distribution of buoyancy (B∗). First, from the experimental results, the Froude number in the inertial phase has its maximum value at 1.33 as the density and buoyancy is homogeneous, always great than the values of non-homogeneous stratified fluid. When density-stratified gravity currents from a weakly stratified source (0.5
論文目次 目錄
摘要 I
Abstract II
目錄 IV
表目錄 V
圖目錄 VI
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 3
第二章 文獻回顧 4
第三章 研究方法 6
3.1實驗理論 6
3.2實驗裝置與方式 10
3.3實驗步驟與流程 14
第四章 實驗結果與分析 15
4.1均質異重流 18
4.1.1 定性特徵 18
4.1.2 定量結果 19
4.2 弱分層之分層異重流 21
4.2.1 定性特徵 21
4.2.2 定量結果 25
4.3 強分層之分層異重流 28
4.3.1 定性特徵 28
4.3.2 定量結果 33
第五章 結論 37
參考文獻 42
表目錄
表1 實驗初始條件設計表 12
表2 實驗結果資料表 16


圖目錄
圖1.1 定界交換流實驗影像圖 2
圖1.2 分層異重流實驗影像圖 2
圖3.1 實驗水槽內壁之側視示意圖 10
圖3.2 分層流體製做之示意圖 12
圖4.1 剪應力不穩定現象圖 18
圖4.2 實驗編號A1影像圖 19
圖4.3 實驗編號A1結果圖 20
圖4.4 實驗編號B1影像圖 22
圖4.5 實驗編號E3影像圖 23
圖4.6 實驗編號D5影像圖 24
圖4.7 實驗編號B1結果圖 25
圖4.8 實驗編號E3結果圖 26
圖4.9 實驗編號D5結果圖 27
圖4.10 實驗編號B9影像圖 29
圖4.11 實驗編號D4影像圖 30
圖4.12 實驗編號C8影像圖 31
圖4.13 實驗編號B9結果圖 33
圖4.14 實驗編號D4結果圖 34
圖4.15 實驗編號C8結果圖 35
圖5.1  FI 值與 B* 值關係圖 38
圖5.2  ρ*與 B*關係分佈圖 40

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