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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65767完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 黃美嬌 | |
| dc.contributor.author | Pi-Yueh Chuang | en |
| dc.contributor.author | 莊璧躍 | zh_TW |
| dc.date.accessioned | 2021-06-17T00:11:18Z | - |
| dc.date.available | 2012-07-27 | |
| dc.date.copyright | 2012-07-27 | |
| dc.date.issued | 2012 | |
| dc.date.submitted | 2012-07-12 | |
| dc.identifier.citation | [1] H. J. Goldsmid, Introduction to Thermoelectricity, 1 ed.: Springer, 2009.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65767 | - |
| dc.description.abstract | 本論文主要的研究目的乃是了解並預測奈米顆粒複合物之晶格熱傳導係數隨顆粒尺寸及成分比例變化之情形。為了此一目的，我們分別從數值模擬及理論兩方面提出及建立預測工具，兩者並互相驗證以確定其可靠度及準確性。
數值方面我們使用沃羅諾伊圖來建立具有不規則多面體奈米顆粒之複合物的3D數值模擬模型，以求更接近真實材料。為了能夠模擬如此複雜的不規則結構，我們開發運用3D非結構性網格的聲子蒙地卡羅模擬工具 (MC)，使之能夠模擬聲子在具複雜結構之材料內的傳輸現象，並進而計算出材料的等效熱傳導係數。此蒙地卡羅法在本質散射部分使用單一鬆弛時間近似法，而在聲子性質上則使用灰介質假設。 在理論方面，我們首先提出一種EMA理論模型，其能用來預測鑲嵌奈米顆粒之複合材料之等效熱傳導係數，該奈米顆粒濃度可為任意值；而當顆粒濃度為100%時，即複合物完全由單一材料製成的顆粒所組成。接著我們將此EMA模型與三鍵結滲透理論結合，可用來預測由兩種不同材料的奈米顆粒混合而成之複合物其熱傳導係數隨成分比例之變化情形。 文中以純矽、純鍺、及混合矽鍺奈米顆粒複合物進行探討驗證。結果顯示理論模型及MC模擬之預測非常吻合，其中又以使用介面密度來定義之等效顆粒直徑所得到的理論值與模擬結果最為吻合，這也驗證了介面密度主導了奈米複合物熱傳導係數這一論點。惟目前理論模型與模擬工具皆尚未能考慮聲子散射率及介面穿透率的頻率相依性，故僅適用於顆粒等效直徑小於聲子淨平均自由路徑或熱傳主要由短平均自由路徑之聲子所貢獻時之材料預測上。 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2021-06-17T00:11:18Z (GMT). No. of bitstreams: 1 ntu-101-R99522120-1.pdf: 8033298 bytes, checksum: ea2e534ad32a223dc9fc3be72adae9e1 (MD5) Previous issue date: 2012 | en |
| dc.description.tableofcontents | 口試委員會審定書 i
中文摘要 ii 英文摘要 iii 表目錄 viii 圖目錄 ix 第一章 緒論 1 1-1 文獻回顧 1 1-2 研究動機及目的 7 1-3 論文架構 8 第二章 3D非結構性網格聲子蒙地卡羅法 9 2-1 基本理論 9 2-1-1 聲子波茲曼傳輸方程式 9 2-1-2 灰介質假設 10 2-1-3 介面穿透模型 11 2-2 聲子性質初始化 13 2-3 主程式 14 2-3-1 聲子位移與本質散射 14 2-3-2 介面散射 15 2-3-3 邊界條件與邊界熱流控制 16 2-3-4 能量守恆及網格性質資料更新 20 2-3-5 主程式流程與平行化 21 2-4 後處理 22 2-5 程式驗證 23 2-5-1 暫態熱擴散問題 23 2-5-2 塊材熱傳導係數模擬 24 2-5-3 超晶格薄膜垂直與平行平面熱傳導係數 25 2-5-4 超晶格薄膜斜向熱傳導係數 27 第三章 奈米顆粒複合材料熱傳導係數理論預測模型 28 3-1 稀薄EMA模型 28 3-2 高濃度EMA模型 30 3-3 尺寸效應下高濃度EMA模型 33 3-4 兩種不同材料顆粒混合EMA模型 35 3-5 等效顆粒直徑定義 36 第四章 奈米顆粒複合物熱傳導係數 39 4-1 幾何模型與網格劃分 39 4-1-1 沃羅諾伊圖 39 4-1-2 沃羅諾伊顆粒複合物模型 40 4-1-3 網格與模型驗證 41 4-2 純矽與純鍺奈米顆粒複合物 42 4-3 混合矽/鍺奈米顆粒複合物 46 第五章 結論與未來展望 49 5-1 結論 49 5-1-1 數值模擬工具 49 5-1-2 奈米顆粒複合物理論預測模型 49 5-1-3 純矽、純鍺、及混合矽/鍺奈米顆粒複合物熱傳導係數 50 5-2 未來展望 50 參考文獻 52 | |
| dc.language.iso | zh-TW | |
| dc.subject | 三鍵結滲透理論 | zh_TW |
| dc.subject | 沃羅諾伊圖奈米顆粒 | zh_TW |
| dc.subject | 非結構性網格 | zh_TW |
| dc.subject | 晶格熱傳導係數 | zh_TW |
| dc.subject | 蒙地卡羅法 | zh_TW |
| dc.subject | EMA模型 | zh_TW |
| dc.subject | Lattice thermal conductivity | en |
| dc.subject | Voronoi nanograins | en |
| dc.subject | Monte-Carlo simulation | en |
| dc.subject | EMA model | en |
| dc.subject | three-bond percolation theory | en |
| dc.title | 不規則奈米顆粒複合物熱傳導性質研究 | zh_TW |
| dc.title | Model and Numerical Predictions of the Thermal Conductivity of 3D Random Nanoparticle Composites | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 100-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 楊照彥,周雅文 | |
| dc.subject.keyword | 晶格熱傳導係數,沃羅諾伊圖奈米顆粒,非結構性網格,蒙地卡羅法,EMA模型,三鍵結滲透理論, | zh_TW |
| dc.subject.keyword | Lattice thermal conductivity,Voronoi nanograins,Monte-Carlo simulation,EMA model,three-bond percolation theory, | en |
| dc.relation.page | 85 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2012-07-12 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
| 顯示於系所單位： | 機械工程學系 | |
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| ntu-101-1.pdf 未授權公開取用 | 7.85 MB | Adobe PDF |
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