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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 李雨 | |
dc.contributor.author | You-Hsuan Yen | en |
dc.contributor.author | 顏佑軒 | zh_TW |
dc.date.accessioned | 2021-06-17T08:09:32Z | - |
dc.date.available | 2019-08-20 | |
dc.date.copyright | 2019-08-20 | |
dc.date.issued | 2019 | |
dc.date.submitted | 2019-08-16 | |
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Raj, “Enhancement of thermal conductivity in magnetite based nanofluid due to chainlike structures,” Applied Physics Letters, 91, 203108 (2007). 20. S. Thurm and S. Odenbach, “Particle size distribution as key parameter for the flow behavior of ferrofluids,” Physics of Fluids 15, 1658 (2003) 21. M. Mahdavi, M. J. Haron, F. Namvar, B. Nadi, M. Z. A. Rahman and J. Amin, “Synthesis, surface modification and characterisation of biocompatible magnetic iron oxide nanoparticles for biomedical applications,” Molecules, 18, 7533-7548 (2013). 22. G. Donzelli, R. Cerbino and A. Vailati, “Bistable heat transfer in a nanofluid,” Physical Review Letters, 102, 104503 (2009). 23. C. Kleinstreuer, J. Li, and J. Koo, “Microfluidics of nano-drug delivery.” International Journal of Heat and Mass Transfer, 51(23): 5590-5597 (2008). 24. 蔡宗翰, “奈米流體熱傳導係數的研究及奈米磁性流體於變壓器上的應用,” 國立台灣大學博士論文 (2010). 25. F. T. Ulaby and U. Ravaioli, “Fundamentals of Applied Electromagnetics,” 7th ed., Pearson Education Limited, London (2015). 26. “霍爾效應,”中興大學物理實驗課程教材http://ezphysics.nchu.edu.tw/prophys/basicexp/expnote/hall/hall_97Feb.pdf. 27. Israelachvili, J.N., “Intermolecular and surface forces,” Third edition, Academic press, New York (2011), p. 254. 28. 葉星毅, “二氧化鈦奈米流體黏滯性質的實驗探討,” 國立臺灣大學碩士論文 (2014). 29. R. J. Hunter, 'Zeta potential in colloid science: principles and applications,' Academic press (1988). 30. J. Howard, “Mechanics of motor proteins and the cytoskeleton,” Sinauer Associates, Inc., Sunderland, Massachusetts, USA (2001). 31. A. Einstein, “On the Motion – Required by the Molecular Kinetic Theory of Heat – of Small Particles Suspended in a Stationary Liquid,” Annalen der Physik 17 (8): 549–560 (1905). 32. 李雨, 施博仁, 江宏仁, 趙聖德, 李皇德, 陳瑞琳, 陳冠宇, “奈米科技中的力學”. 臺北市:臺大出版中心 (2018) 33. https://zi.media/@yidianzixun/post/Rf3awp 34. “X-Ray Diffraction (XRD), 中興大學物理系課程教材,”http://ezphysics.nchu.edu.tw/CTSP/XRD%20power%20point.pdf 35. S. Sen, V. Govingarajan, C. J. Pelliccione, J. Wang, D. J. Miller and E. V. Timofeeva, “Surface modification approach to TiO2 nanofluids with high particle concentration, low Viscosity, and electrochemical activity,” ACS Applied Materials & Interfaces, 7(37), 20538–20547 (2015). 36. 莊萬發, “超微粒子材料技術.” 復漢出版社印行 (1995). 37. G.-D. Song, M.-H. Kim, and W.-Y. Maeng, “Optimization of polymeric dispersant concentration for the dispersion-stability of magnetite nanoparticles in water solution,”Journal of nanoscience and nanotechnology, 14(12): p.9525-9533 (2014). 38. H. H. Lee, S. Yamaoka, N. Murayama and J. Shibata, “Dispersion of Fe3O4 suspensions using sodium dodecylbenzene sulphonate as dispersant,”Materials Letters, 61(18): p.3974-3977(2007). 39. https://zh.wikipedia.org/wiki/%E9%BB%8F%E5%BA%A6#%E9%BB%8F E5%BA%A6%E4%B8%8E%E6%B8%A9%E5%BA%A6%E7%9A%84%E5%85%B3%E7%B3%BB | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73757 | - |
dc.description.abstract | 本文以改裝後之Brookfield黏度計(原理為環狀庫埃特流)對含四氧化三鐵粒子(Fe3O4)之磁性奈米流體的黏度進行實驗研究。該改裝後之黏度計其量測套筒改採塑膠製品、並在外圍套上螺線管線圈,以通過施加電流方式產生磁場。量測套筒與線圈皆浸入循環水箱中以消除焦耳熱產生的熱量,使待測流體在實驗過程中保持恆溫。改良後之黏度計與冷卻系統皆由前人研發,在這裡我們配製穩定懸浮的磁性奈米流體、並進行詳細的測試,以驗證磁性奈米流體作為一種智慧流體的可行性。
在本研究中,四氧化三鐵奈米粒子先採用經典的共沉澱法合成,以X射線衍射法測得粒子大小約9.7nm。然後在粒子表面包覆油酸以提供對抗凡得瓦力吸力的空間排斥力,避免粒子在流體中聚結;最後將包覆的粒子分散到基底流體中合成磁性奈米流體。我們採用真空泵油(VPO)與變壓器絕緣油(TO)兩種基底流體,合成Fe3O4-VPO奈米流體與Fe3O4-TO奈米流體,就其黏度在不同溫度(16oC – 30oC)、不同體積分率(0% – 4%)、不同磁場強度(0 – 100 高斯,於量測套筒頂部量測)及流體合成後不同時間(老化效應)進行量測。我們發現:(1)隨著溫度升高,奈米流體的黏度降低,但奈米流體與基底流體的黏度比值只呈微幅增加。(2)奈米流體的黏度值隨磁場強度與體積分率增加而提升。(3)通過施加重複磁場(在一個週期中磁場施加5分鐘,然後關閉5分鐘),發現磁性奈米流體的黏度可以根據需求由磁場“瞬間”調節,在磁場開啟時黏度快速增加但磁場關閉時黏度迅速恢復原值,且增加幅度與磁場強度成正比。(4)本實驗配製之奈米流體在磁場作用下為剪切稀化流體。(5)老化效應對Fe3O4-VPO奈米流體的影響較小,但對Fe3O4-TO奈米流體影響很大,因此Fe3O4-VPO奈米流體更適於應用。 | zh_TW |
dc.description.abstract | Viscosity of magnetic nanofluid with Fe3O4 particles was studied experimentally using a modified Brookfield viscometer (based on circular Couette flow), with its cylindrical test section enclosed by an electric coil for generating the magnetic field through the application of an applied current. The test section together with the coil were immersed in a circulating water tank for removing the heat due to Joule heating, such that the test fluid was kept at a constant temperature during the experiment. Both the modified viscometer and the cooling system were developed by the previous investigators, and here we performed detailed tests of stable magnetic nanofluid fluids, for demonstrating that the magnetic nanofluids can potentially be served as a smart fluid.
Fe3O4 particles were synthesized using the classical co-precipitation method, and their sizes were measured as around 9.7 nm using X-ray diffraction. The particles were then coated with oleic acid for providing repulsive steric force against van der Waals force, avoiding the coagulation of particles in liquid. The coated particles are then dispersed into base fluid for the synthesis of magnetic nanofluids. Two base fluids, vacuum pump oil (VPO) and transformer oil (TO), were used. The viscosities of Fe3O4-VPO nanofluid and Fe3O4-TO nanofluid were measured for different temperature (16oC – 30oC), different volume fraction (0% – 4%), different magnetic field strength (0 – 100 Gauss, measured at the top of the test section), and different times after the fluids were synthesized (aging effect). We found: (1) The viscosity of the nanofluid decreases, but the ratio of the viscosity of the nanofluid to that of the base fluid increases slightly, as the temperature increases. (2) The viscosity of the nanofluid increases with the magnetic field strength and volume fraction. (3) Through a repeated periodic excitation of applied magnetic field (field is on for 5 minutes and then off for 5 minutes within a cycle), it was found that the viscosity of magnetic nanofluid could be tuned “instantaneously” as desired by the magnetic field. In particular, viscosity was enhanced when the magnetic field was on, and recovered when the field was off; and the enhancement was proportional to the field strength. (4) The nanofluids in this study are shear thinning nanofluids under the action of magnetic field. (5) The aging effect is minor for Fe3O4-VPO nanofluid, but is substantial for Fe3O4-TO nanofluid. Thus the Fe3O4-VPO nanofluid is more appropriate for application. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T08:09:32Z (GMT). No. of bitstreams: 1 ntu-108-R06543017-1.pdf: 6579857 bytes, checksum: 723d021f340b75584cf9c2188c87f938 (MD5) Previous issue date: 2019 | en |
dc.description.tableofcontents | 致謝 i
摘要 ii Abstract iii 目錄 v 圖目錄 vii 表目錄 xi 第一章 緒論 1 1.1 研究背景 1 1.2 研究動機 2 1.3 文獻回顧 3 1.4 本文架構 4 第二章 實驗原理 5 2.1 轉子黏度計之量測原理 5 2.2 螺線管線圈原理 8 2.3 高斯計之磁場量測原理 10 2.4 奈米粒子與基底流體間之作用力 13 2.5 奈米粒子間之作用力 16 2.5.1凡得瓦力 16 2.5.2電雙層 20 2.6 粒子表面改質 22 2.7 XRD量測原理 24 第三章 實驗方法 27 3.1 奈米流體配製 27 3.1.1四氧化三鐵奈米顆粒製造法 28 3.1.2奈米粒子表面改質法 30 3.1.3基底流體選擇 31 3.1.4奈米流體調配方法 33 3.2 黏度量測 34 3.2.1磁場施加裝置與量測套筒改良 35 3.2.2散熱系統改良 38 3.3 奈米流體黏度與溫度關係 40 3.4 奈米流體黏度與轉子轉速關係 41 3.5 奈米流體黏度與磁場關係量測步驟 42 3.5.1量測施加磁場後奈米流體之黏度 42 3.5.2量測重複磁場下奈米流體之黏度 42 3.5.3量測不同剪應變率下奈米流體於各磁場強度之黏度 43 3.5.4量測不同磁場強度下奈米流體之黏度 43 3.5.5量測不關閉磁場狀況下改變磁場強度對奈米流體黏度之影響 44 3.5.6老化效應 44 第四章 結果與討論 45 4.1以共沉澱法產生奈米粒子與表面改質可增加奈米流體的穩定性 45 4.2奈米流體黏度與溫度的關係 47 4.3奈米流體黏度與轉子轉速關係 51 4.4長時間施加磁場對奈米流體之黏度效應 53 4.5重複開關磁場對奈米流體黏度之測試 56 4.6奈米流體的剪切稀化效應 58 4.7不同磁場強度對奈米流體黏度之效應 61 4.8不關閉磁場狀況下改變磁場強度對奈米流體黏度之影響 67 4.9老化效應 72 第五章 結論與未來展望 75 5.1結論 75 5.2未來展望與未來工作 76 參考文獻 77 | |
dc.language.iso | zh-TW | |
dc.title | 磁性奈米流體黏度的實驗研究 | zh_TW |
dc.title | Experimental study on the viscosity of magnetic nanofluids | en |
dc.type | Thesis | |
dc.date.schoolyear | 107-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 沈弘俊,王安邦 | |
dc.subject.keyword | 磁性奈米流體,四氧化三鐵粒子,黏度,磁場,老化效應, | zh_TW |
dc.subject.keyword | Magnetic nanofluid,Fe3O4 particles,viscosity,magnetic field,aging effect, | en |
dc.relation.page | 79 | |
dc.identifier.doi | 10.6342/NTU201903864 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2019-08-16 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 應用力學研究所 | zh_TW |
顯示於系所單位: | 應用力學研究所 |
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