Three-Dimensional Numerical Investigation of Heat Transfer and Pressure Drops in Corrugated Plate Channels
陳立昀、吳佩學
E-mail: [email protected]
ABSTRACT
本研究利用Fluent計算流體力學套裝軟體作數值計算，探討波形板流道的局部熱傳係數分佈與沿流道之壓降。探討條件包 含正弦與正三角形的流道截面幾何形狀，40°、60°、70°及90°的褶紋傾斜角，雷諾數由2000變化到8000，工作流體則 包含空氣及水。 計算結果顯示，壓降與熱傳性能均會隨波紋傾斜角度的增加而上升；正三角形截面比正弦截面的流道有較 好的熱傳效果；在相同的雷諾數下，水比空氣的紐賽數較高。在褶紋傾斜角度為40°的情形，大部分的流體沿著溝槽流動
，雖然褶紋傾斜角度為60°的情形有較好的熱傳係數，但是它相對的摩擦因子也比90°的情形高很多。科本因子與摩擦因 子的比值以 褶紋傾斜角度為90°的情形較好。
Keywords : 波形板流道 ; 計算流體力學 ; 褶紋傾斜角 ; 局部熱傳係數 ; 壓降 Table of Contents
目錄 ix 圖目錄 xi 表目錄 xiv 符號說明 xv 第一章 前言 1 1.1 研究動機與背景 1 1.2 研究目的 3 第二章 國內外相關文獻之研究 7 2.1 山型紋傾斜角的影響 8 2.2 山型紋板片之節距與波紋振幅對性能的影響 12 第三章 研究方法與進行步驟 18 3.1 基本架 構 18 3.2 數值模擬程序 18 3.2.1 建立幾何模型 18 3.2.2 模型之網格建構與網格品質檢查 19 3.2.3 流場數學模型之選用 21 3.2.4 數值計算方法 26 3.2.5 邊界條件設定 31 3.2.6 收斂條件設定 32 第四章 結果與討論 44 4.1 選擇紊流模式之依據 44 4.2 流場之計算結果 44 4.3 熱傳分析 45 4.4 壓降分析 46 第五章 結論 61 參考文獻 62
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