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題 名 | 低溫水置於多孔介質內之暫態自然對流行為之研究 |
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作 者 | 張文政; 楊東芳; | 書刊名 | 力學 |
卷 期 | 11:4 1995.12[民84.12] |
頁 次 | 頁379-384 |
分類號 | 440.137 |
關鍵詞 | 低溫水; 多孔介質; 暫態行為; Cold water; Porous medium; Transient behavior; |
語 文 | 中文(Chinese) |
中文摘要 | 本文係以數值法來探討矩型密閉空間多孔介質內低溫水之暫態行為及熱傳問題。 數值結果顯示:密度﹣溫度之非線性因素對於暫態流場以及熱傳量大小有很大的影響。當最 大密度參數 R( = (T �o- T �� )/(T □- T �� )) < 0.5 時, 高溫壁邊之左順時漩流 隨時間增加一直增大,穩態時幾乎佔滿整個空間; R = 0.5 時,左順時漩流由很小隨時間 而增大,穩態時空間內為兩相等大小之漩流; R > 1.0 時,任何時間空間都只有一個逆時 漩流。當τ> 10 □,任何時間下之達西數越大,熱傳效果越好。隨著時間的增加,高溫壁 面上之熱傳效果越不好,低溫壁面上之熱傳效果越好,當達到穩態時,高、低溫壁面的熱傳 會一樣。 |
英文摘要 | A numerical study is performed to analyze the transient flow and heat transfer behavior of cold water in a rectangular enclosure filled with a porous medium. The numerical results show that the nonlinear relation between density and temperature has strong effects on the transient flow field, and heat transfer rate. For R(=(T �o -T �� )/(T □ -T �� ))<0.5, the size of the clockwise vortex beside the high temperature surface increases as the time increases. The clockwise vortex occupied almost the whole space when the steady state is reached. For R =0.5, the size of the clockwise vortex adjacent to the high temperature surface increases as the time increases. However, two counter-rotation vortices having the same strength and size are existed in the space when the steady state is reached. For R>1, only one counterclockwise vortex is existed in the space all the time. For τ >10 □, the heat transfer rate increases with the Darcy number increases all the time. However, as the time increases, the heat transfer rate on the high temperature surface decreases and that on the low temperature surface increases. The two surfaces have the same heat transfer rate when the steady state is reached. |
本系統中英文摘要資訊取自各篇刊載內容。