進階搜尋


   電子論文尚未授權公開,紙本請查館藏目錄
(※如查詢不到或館藏狀況顯示「閉架不公開」,表示該本論文不在書庫,無法取用。)
系統識別號 U0026-1208201911171400
論文名稱(中文) 四層自然材料於熱隱形性能的暫態分析
論文名稱(英文) Transient Analysis of Four-Layer Natural Materials in Thermal Cloaking Performance
校院名稱 成功大學
系所名稱(中) 工程科學系
系所名稱(英) Department of Engineering Science
學年度 107
學期 2
出版年 108
研究生(中文) 謝雨樵
研究生(英文) Yu-Chiao Hsieh
學號 n96051295
學位類別 碩士
語文別 中文
論文頁數 56頁
口試委員 指導教授-楊瑞珍
口試委員-楊鏡堂
口試委員-楊煥成
口試委員-張建成
口試委員-張志彰
中文關鍵字 熱學遮罩  熱學超材料 
英文關鍵字 Thermal cloak  Thermal metamaterials 
學科別分類
中文摘要 本論文探討熱學遮罩由暫態至定常態過程中,其熱隱形與熱保護之效果。熱遮罩之設計以結構簡單易製造且材料為常見容易取得的天然物質為重點,為了能夠更好的滿足計算所得的各向異性熱導係數以及非均質的密度與比熱乘積,提出四層的熱遮罩。以研究暫態熱隱形性能為方向,首先比較設計之遮罩、雙層遮罩以及單純背景之間溫度分布的差異,接著定義特定參數並模擬分析取得數值,以定量比較差異大小。除了數值分析以外亦進行實驗,使用紅外線熱像儀來量測溫度分布,再將結果與模擬相互驗證。由於裝置與空氣間的熱交換以及裝置各零件之間的間隙,可以發現實驗之各區域溫度稍微低於模擬結果,且零件交接處有溫降現象;儘管有以上這些實驗誤差,但熱遮罩之效果依然存在。在進行電腦模擬時,選擇兩條量測線來定量估計設計之遮罩與雙層遮罩之性能,模擬結果顯示在暫態的大部分時間,四層遮罩相較於雙層遮罩在量測線上高低溫差較小,並且四層遮罩在量測線上平均溫度較接近無遮罩時的背景溫度,因此四層遮罩在暫態熱隱形的性能較雙層遮罩良好。最後,使用一個基於保護區平均溫度與初始溫度的差異的暫態品質因數,來評估所設計之四層遮罩在保護區的性能,而數值與實驗的結果均顯示,相比於無遮罩的情況,四層遮罩擁有相對較長的熱保護效果。
英文摘要 This thesis investigates the thermal cloaking and shielding performance in a thermal cloak, from transient to steady state. The thermal cloak design is relatively simple, and the materials are common natural materials. To better match the analytical requirement for anisotropic heat conductivity and inhomogeneous product of density and specific heat capacity, the proposed thermal cloak uses four layers. In order to study the transient thermal cloaking performance, the temperature distribution differences among the designed cloak, bilayer cloak and the background were first compared, by defining specific parameters and conducting computer simulation to allow a quantitative comparison. In addition to numerical analysis, experiment was carried out using an infrared camera to measure the temperature distribution, and the results were verified with the simulation. The simulation results show that during most of the transient evolution, the four-layer cloak has a lower temperature difference between the maximum and minimum value on the measuring lines than that for the bilayer cloak. Also, the average temperature on the measuring lines is closer to the background temperature without cloak for the four-layer cloak compared to the bilayer cloak. Hence, the transient performance of the four-layer cloak is better than the bilayer cloak. Finally, the performance of the designed four-layer cloak were assessed using a transient figure of merit based on the difference between the transient average temperature in the cloaked region and the initial temperature. Both numerical and experimental result demonstrate the effectiveness of cloaking area a relatively long period compared to the case without cloak.
論文目次 中文摘要I
致謝IX
目錄X
圖目錄XII
表目錄XV
縮寫及符號說明XVI
第一章緒論1
1.1前言1
1.2轉換熱力學與熱學超材料2
1.3文獻回顧4
1.4研究動機與目的14
第二章理論分析15
2.1轉換熱力學15
2.1.1座標轉換下熱傳導方程式型式的不變性15
2.1.2二維圓形熱學遮罩理論分析18
2.2雙層理論20
2.3四層熱學遮罩理論分析23
第三章材料與方法25
3.1軟體與儀器25
3.1.1SolidWorks(SolidWorks2018SP3,SolidWorks,U.S.A.)25
3.1.2COMSOLMultiphysics(COMSOL5.1,COMSOL,Sweden)25
3.1.3OriginPro(OriginPro9.0,OriginLab,U.S.A.)25
3.1.4AutoCAD(AutoCAD2019,Autodesk,U.S.A.)25
3.1.53D印表機(2.5EX,ATOM,U.S.A.)26
3.1.6電子天平(EJ-410,A&D,Japan)27
3.1.7真空幫浦(DOA-P704-AA,GAST,U.S.A.)27
3.1.8加熱板(HP-30D,Shin-Kwang,Taiwan)28
3.1.9靜態水槽(WB-500D,Digisystem,Taiwan)28
3.1.10紅外線熱像儀(E75,FLIR,U.S.A.)29
3.2COMSOL熱傳導模擬30
3.2.1熱遮罩模型30
3.2.2模型材料及邊界條件32
3.3實驗架構34
3.3.1熱遮罩裝置設計34
3.3.2熱遮罩裝置製作35
3.3.3實驗架設37
第四章結果與討論39
4.1四層遮罩與雙層遮罩之熱隱形性能比較39
4.2四層熱遮罩之暫態分析及性能45
4.2.1暫態分析45
4.2.2性能47
4.3實驗與COMSOL模擬之比較51
第五章結論與展望54
參考文獻55
參考文獻 1. Pendry, J.B., D. Schurig, and D.R. Smith, Controlling electromagnetic fields. Science. 312(5781): p. 1780-1782. (2006)
2. Wegener, M., Metamaterials Beyond Optics. Science. 342(6161): p. 939-940. (2013)
3. Chen, T.Y., C.N. Weng, and J.S. Chen, Cloak for curvilinearly anisotropic media in conduction. Applied Physics Letters. 93(11): p. 3. (2008)
4. Fan, C.Z., Y. Gao, and J.P. Huang, Shaped graded materials with an apparent negative thermal conductivity. Applied Physics Letters. 92(25): p. 3. (2008)
5. Li, J.Y., Y. Gao, and J.P. Huang, A bifunctional cloak using transformation media. Journal of Applied Physics. 108(7): p. 5. (2010)
6. Guenneau, S., C. Amra, and D. Veynante, Transformation thermodynamics: cloaking and concentrating heat flux. Optics Express. 20(7): p. 8207-8218. (2012)
7. Narayana, S. and Y. Sato, Heat Flux Manipulation with Engineered Thermal Materials. Physical Review Letters. 108(21): p. 5. (2012)
8. Han, T.C., et al., Homogeneous Thermal Cloak with Constant Conductivity and Tunable Heat Localization. Scientific Reports. 3: p. 5. (2013)
9. Schittny, R., et al., Experiments on transformation thermodynamics: molding the flow of heat. Phys Rev Lett. 110(19): p. 195901. (2013)
10. Zhang, S., C.G. Xia, and N. Fang, Broadband Acoustic Cloak for Ultrasound Waves. Physical Review Letters. 106(2): p. 4. (2011)
11. Zigoneanu, L., B.I. Popa, and S.A. Cummer, Three-dimensional broadband omnidirectional acoustic ground cloak. Nature Materials. 13(4): p. 352-355. (2014)
12. Buckmann, T., et al., An elasto-mechanical unfeelability cloak made of pentamode metamaterials. Nature Communications. 5: p. 6. (2014)
13. Gomory, F., et al., Experimental Realization of a Magnetic Cloak. Science. 335(6075): p. 1466-1468. (2012)
14. Xu, H.Y., et al., Ultrathin Three-Dimensional Thermal Cloak. Physical Review Letters. 112(5): p. 5. (2014)
15. Han, T., et al., Experimental Demonstration of a Bilayer Thermal Cloak. Physical Review Letters. 112(5). (2014)
16. Vemuri, K.P. and P.R. Bandaru, Geometrical considerations in the control and manipulation of conductive heat flux in multilayered thermal metamaterials. Applied Physics Letters. 103(13): p. 4. (2013)
17. Narayana, S., S. Savo, and Y. Sato, Transient heat flux shielding using thermal metamaterials. Applied Physics Letters. 102(20): p. 201904. (2013)
18. Ooi, E.H. and V. Popov, Transformation thermodynamics for heat flux management based on segmented thermal cloaks. The European Physical Journal Applied Physics. 63(1): p. 10903. (2013)
19. Zhang, Y.M., H.Y. Xu, and B.L. Zhang, Design, implementation, and extension of thermal invisibility cloaks. Aip Advances. 5(5): p. 12. (2015)
20. Raza, M., et al., Transformation thermodynamics and heat cloaking: a review. Journal of Optics. 18(4): p. 13. (2016)
論文全文使用權限
  • 同意授權校內瀏覽/列印電子全文服務,於2024-08-12起公開。
  • 同意授權校外瀏覽/列印電子全文服務,於2024-08-12起公開。


  • 如您有疑問,請聯絡圖書館
    聯絡電話:(06)2757575#65773
    聯絡E-mail:etds@email.ncku.edu.tw