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研究生:褚育辰
研究生(外文):Yu-Chen Chu
論文名稱:熱源佈置於方形封閉腔體內的奈米流體熱傳影響研究
論文名稱(外文):Effect of the Layout of Heat Sources on the Convection of Nanofluid in a Square
指導教授:許燦輝
指導教授(外文):Tsan-Hui Hsu
學位類別:碩士
校院名稱:國立高雄應用科技大學
系所名稱:機械與精密工程研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
畢業學年度:100
語文別:中文
論文頁數:101
中文關鍵詞:奈米流體熱源體積濃度
外文關鍵詞:NanofluidSourceSolid Volume Fraction
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本文主要針對方形封閉腔體內熱源於不同的位置下,利用計算流體力學(Computational Fluid Dynamics,CFD)方法來進行分析,首先使用Gambit軟體建立熱通量在於方形封閉腔體內的底部模型及網格設定,再結合計算流體力學的套裝軟體Fluent來模擬。封閉腔體內的加熱造成對流的影響,左壁面為熱壁面,右壁面為冷壁面,上壁面為絕熱壁,下壁面則是位置的不同、數量分佈的不同來對封閉的方形腔體內做加熱。探討在Ra不同的大小(105~107)、奈米濃度的變化(2%、4%、6%)與不同的奈米流體粒子等條件下,對整個封閉的方形腔體內的溫度的分佈、流場的流動、局部Nusselt數的比較。研究結果顯示熱源位置的不同對整個腔體內的流量大小也跟隨改變,三種奈米顆粒材料較氧化鈦較差,體積濃度(φ)的增加Nusselt數也有提升
Natural convection in a square enclosure with heat source at various locations was studied numerically. The well-known CFD software FLUENT package combined with Gambit was used for simulation. The system considered including change of the location of heat source on the bottom wall. The fluid adopted in the enclosure is nanofluid with different concentration of nanoparticle, various material of nanoparticle(2%、4%、6%). The governing parameter Ra (105~107)affecting the convection heat transfer is investigated as well. The numerical results are displayed and discussed with stramlines, temperature distributions, and Local Nusselt Number. It is found the heat transfer quantity transported by fluid saturated with nanoparticle is larger. The material and concentration of nanoparticle influence the convection heat transfer in the enclosure significantly.the results show that the different heat source positionto follow the change of the flow in entire cavity,three kinds of nanoparticle TiO2 is bad,lncreasing solid volume fraction(φ) that the Nusselt number has been raised
中文摘要 I
ABSTRACT II
致謝 III
表目錄 VI
圖目錄 VII
符號說明 XIII
第1章 緒論 1
1-1 研究動機 1
1-2 研究目的 1
1-3 相關文獻回顧 2
第2章 理論分析 4
2-1 物理模型與基本假設 4
2-2 統御方程式 7
2-3 奈米流體 11
2-4 紐賽數的數值 12
2-5 水和奈米粒子的參數 12
2-6 FLUENT電腦軟體之簡介 13
2-7 CFD軟體分析步驟 14
2-8 網格形式 16
2-8-1 結構化網格 16
2-8-2 非結構化網格 17
第3章 軟體模擬驗證 18
3-1 模型建立與相關設計 18
3-2 分析結果 19
3-3 各個網格的探討 20
第4章 結果與討論 21
4-1 探討不同熱源大小與位置和在各瑞利數下的變化 21
4-1-1 模型case1的模擬分析 21
4-1-2 模型case2的模擬分析 22
4-1-3 模型case3、case4的模擬分析 23
4-2 探討同瑞利數下的不同熱源與熱壁面的局部NUSSELT數 25
4-2-1 模型case1的熱壁面局部Nusselt數 25
4-2-2 模型case2的熱壁面局部Nusselt數 26
4-2-3 模型case3、case4的熱壁面局部Nusselt數 26
4-3 探討不同奈米流體材料的影響 28
4-4 探討不同奈米流體濃度的影響 28
第5章 結論 80
5-1 結論 80
5-2 未來展望與建議 81
參考文獻 82
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