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題 名 | 顆粒於不對稱型貯槽流動行為之電腦模擬--離散元素法=Computer Simulations of Flowing Behavior of Particles in the Asymmetrical Hopper Based on Discrete Element Method(DEM) |
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作 者 | 周春禧; 徐振淏; 徐毅理; 郭景宗; 蕭述三; | 書刊名 | 國立屏東科技大學學報 |
卷 期 | 9:4 2000.12[民89.12] |
頁 次 | 頁279-294 |
分類號 | 445.545 |
關鍵詞 | 離散元素法; 不稱型貯槽; 電腦模擬; 流動式顆粒床; Discrete element method; DEM; Asymmetrical hopper; Computer simulation; Moving granular bed; |
語 文 | 中文(Chinese) |
中文摘要 | 應用顆粒於不稱型貯槽之堆疊原理[7],設定顆粒之初始座標與貯槽槽體之位置(i.e.邊界條件)。應用離散元素法(DEM)[14]模擬100個直徑1cm的圓盤狀顆粒於三種不對稱型Hopper之運動軌跡,流動的型態(Flow Pattern)以及流速場(Velocity Field)。三種不對稱型Hopper為:(1)LA=150,RA=400;(2)LA=150,RA=200。上述LA為左側Hopper邊界與直垂線之夾角,RA為右側Hopper邊界與垂直線之夾角。由電腦模擬的結果,証實Hopper的邊界與垂直線之間的夾角,影響顆粒之流動行為。接近於陡峭側(i.e.貯槽左側邊界)的顆粒具有較快的流速,反觀,接近於貯槽右側邊界的顆粒,則緩慢流動,甚至形成類似停滯區。本研究的電腦模擬結果與[10]的實驗觀測結果都証實接近於貯槽右側邊界的顆粒之流速緩慢,且形成類似停滯區。本研究的電腦模擬結果與[8-13]的實驗觀測結果有助於設計雛型流動式顆粒床高溫廢氣淨化系統。 |
英文摘要 | By employing the theory of stack of particles in the asymmetrical hopper [7], the initial coordinates of Particles and the boundary of hopper are defined. By making use of DEM model [14], the path, flow pattern, and velocity field of disks in the asymmetrical hopper are studied numerically. Three kinds of asymmetrical hopper ((i)LA=150,RA=400;(ii)LA=150, RA=300;(iii)LA=150,RA=200) are used contain 100 disks of 1cm diameter, respectively. LA is the angle between the left boundary of hopper and vertical line, and RA is the angle between the right boundary of hopper and vertical line. The results of computer simulation show that the hopper boundary affect the flowing behavior of disks. The research work reported here and [10] show that the disks close to the right hopper boundary move slowly and develop the quasi-stagnant zone. The numerical results reported here and the experimental results [8-13] provide fundamental and important information for designing moving granular bed flue gas cleanup filter. |
本系統中英文摘要資訊取自各篇刊載內容。