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題 名 | Visualization of Wind Induced Mixing in Stably Stratified Fiuids=風引致穩定層變流體混合現象之可視量測 |
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作 者 | 黃榮鑑; 姚家琪; | 書刊名 | 力學 |
卷 期 | 11:3 1995.09[民84.09] |
頁 次 | 頁243-252 |
分類號 | 440.137 |
關鍵詞 | 可視化; 風引致; 層變; 質點圖像位移測速法; Visualization; Wind-induced; Stratified; PIDV; |
語 文 | 英文(English) |
中文摘要 | 近幾十年來,隨著計算機的快速發展和廣泛使用,有限元素法(Finite Element Method )已成為科學工程上數值分析的有力工具。本文即是利用有限元素法分析軟體 MARC ,以 Updated Lagrange Formulation ( U.L.F. )推導的彈塑性大變形理論對於 35NCD16 高強度合金鋼之動態撞擊行為, 進行分析與模擬。 在本研究中, 是以鎢穿甲材料、 AISI 4340 這兩種材料的平頭撞擊物分別在 20 m/s、50 m/s、75 m/s、100 m/s 四種速度下,正 向撞擊 35NCD16 平板。 由結果我們發現,撞擊速度以及撞擊體的材料性質對於平板的變形 有顯著不同的影響。 |
英文摘要 | An experimental investigation of wind-induced flow and mixing processes in stratified fluids is reported in this study. Flow visualization method is used to observe the flow motions. A qualitative and quantitative flow image system named Patricle Image Displacement Velocimetry (PIDV) is developed and applied to visualize the velocity field of wind induced flow near the downwind end wall. The imaging system provides instantaneous, full-field velocity measurement on a projected two-dimensional plane. The flow in the test section is illuminated by a halogen light sheet from two slide projectors. A CCD video camera and video tapes are used to record the motions of fluid particles in the flow field. An automatic analysis system is developed to analyze the images and calculate the velocity vectors. Salinity measurements give the density profiles which are compared with the measured velocity fields. The results show the qualitative and quantitative measurement of: (a) the flow circulation patterns and mixing processes; (b) the distributions of full-field velocity vectors; and (c) the locations of plunge points. |
本系統中英文摘要資訊取自各篇刊載內容。