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研究生:張耀文
論文名稱:具阻礙物之矩形流道之流場與溫度場分析
論文名稱(外文):Flow Field and Temperature Field Analysis in The Rectangular Duct With Baffles
指導教授:莊福盛
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:機械工程系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:1999
畢業學年度:87
語文別:中文
論文頁數:85
中文關鍵詞:矩形流道
外文關鍵詞:rectangular duct
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本文主要是用數值的方法來計算具阻礙物之矩形流道入口區域(entrance region)流體的發展(developing)情形,流體限定在層流(laminar)的情況下,配合等溫(isothermal)的邊界條件,求出速度分布與溫度分布。在此還特別對不同阻礙物高與矩形高之比(F/H),不同阻礙物週期性間距與矩形高之比(L/H),不同阻礙物數目N的矩形流道加以分析其速度與溫度分布,由速度和溫度圖來探討對熱傳效果的影響。
本文所計算的流體主要是針對Prandtl number 為0.71,以空氣的性質為代表。雷諾數(Reynolds number)為200、400、600,阻礙物高與矩形高之比(F/H)為0.25、0.5、0.75,阻礙物週期性間距與矩形高之比(L/H)為0.5、1、2,阻礙物數目為3、7,在不同的幾何形狀下,可以發現在矩形流道速度與溫度的分佈受到矩形區域阻礙物高度不同而有不同的影響。

The purpose of this study is to use the numerical method to investigate the developing situation of fluid in a rectangular duct with baffles in the entrance region. The flow is laminar and with isothermal boundary. The influences of various factors, such as the ratio of obstacle’s height and rectangle’s height (F/H), the ratio of periodic length of baffles and rectangle’s height (L/H), and numbers of obstacles in the flow path, on the velocity and temperature distributions are studied.
The fluid calculated is focused on Prandtl number being equal to 0.71 and having characteristics of air. The related Reynolds number is 200, 400, 600, the radio of F/H is 0.25, 0.5, 0.75 and the radio of L/H is 0.5, 1, 2, numbers of obstacles are 3, 7. In different geometric shapes, we found that the velocity and temperature distributions in the rectangle flow path are greatly influenced by the height of obstacle in that region.

第一章 緒論 1
1-1 前言 1
1-2 文獻回顧 2
1-2-1 數值方法 2
1-2-2 矩形流道 3
1-3 研究目的 5
1-4 內容大綱 5
第二章 理論分析 7
2-1 幾何模型 7
2-2 基本假設 8
2-3 統御方程式 8
2-4 邊界條件 9
第三章 數值分析 12
3-1 數值方法 12
3-2 差分方程式 13
3-3 演算過程 16
3-4 收斂準則 18
第四章 結果與討論 23
4-1 前置分析 23
4-2 速度場之分析 24
4-3 溫度場之分析 31
第五章 結論與未來展望 80
5-1 結論 80
5-2 未來展望 81
文獻參考 82

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