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  • 學位論文

奈米流體熱性質分析與提升熱交換性能之研究

Research of Thermal Properties and Enhanced Heat Exchange Performance for Nanofluids

指導教授 : 卓清松
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摘要


本研究的主要目的在評估水系奈米流體提升熱交換性能的可行性,由開發高性能熱交換的工作流體與光觸媒自我潔淨兩方面出發,完成奈米流體基本性質與應用研究。在奈米流體製造方面,分別採用一階製程製備「氧化銅-水」奈米流體,使用二階製程製備三氧化二鋁-水與二氧化鈦-水奈米流體,並以實驗研究法探討此三種奈米流體在不同濃度與溫度條件之下,其熱傳導係數、密度、流變特性、壓降及熱對流係數的影響,最後並實際應用於氣冷式熱交換器,藉以評估奈米流體應用於熱交換領域之可行性。而在光觸媒自我潔淨方面,則是使用二氧化鈦奈米流體披覆於不?袗?基板上,製成光觸媒反應器,評估在開放式熱交換系統除藻的性能。 本研究針對氧化銅-水、三氧化二鋁-水與二氧化鈦-水奈米流體進行相關實驗研究,主要的貢獻除了在於確認奈米流體相關基礎性質之外,更在壓降、熱交換性能與開發光觸媒除藻裝置進行實驗研究,並在研究結果中發現傳統磨擦係數方程式無法計算層流範圍的壓降,故由實驗數據提出修正,以符合層流區間壓降估算的需求。在熱對流係數與熱交換的研究發現,熱交換器的結構與溫度亦會影響奈米流體在熱傳性能。此外,本研究所提出的光觸媒除藻裝置能有效地抑制水中藻類滋生,達到淨化水質的功能。 上述研究成果希望能對奈米流體熱交換領域的研究者進行相關研究時參考,並對節能與開發新型高熱交換性能工作流體方面有所貢獻。

並列摘要


The main purpose of this thesis is to evaluate the feasibility of enhancing heat exchange performance by water-based nanofluids. The research is conducted from two aspects: the development of work fluids with high performance of heat exchange, and the self-cleaning of photocatalyst, so as to study the fundamental properties and application of nanofluids. In the aspect of preparation of nanofluids, CuO-water nanofluid was prepared by one-step synthesis of continuously controlled submerged arc nano synthesis system (CC-SANSS); Al2O3- and TiO2-water nanofluids were prepared by two-step synthesis. In the aspect of fundamental properties, experimental research method was implemented to investigate the influence on the thermal conductivity, density, rheology, pressure drop and heat convection coefficient of three types of nanofluids under different weight fractions and different temperatures. Finally, the study practically applied them to the air-cooled heat exchanger, so as to evaluate the feasibility of applying nanofluids to the domain of heat exchange. In the aspect of self-cleaning by photocatalyst, a photocatalytic reactor was made by coating TiO2 nanofluids on the stainless steel plate, and it was used to evaluate the de-algae performance in an open heat exchange system. The study underwent the related experimental research focusing on CuO, Al2O3 and TiO2–water nanofluids. Not only contributive to the confirmation of their fundamental properties, the study also implemented experimental research of pressure drop, heat exchange performance, and the development of photocatalytic de-algae device. From the results of research, it was discovered that the traditional friction factor equation could not calculate the pressure drop in laminar flow region. Hence, the study proposed a revised equation by experimental data to estimate the pressure drop in laminar flow region. From the experimental data of heat convection coefficient and heat exchange volume, it was found that the structure and temperature of heat exchanger would influence the heat transfer performance of nanofluids. Besides, the photocatalytic de-algae device proposed by the study could effectively restrain the growth of algae in water, and had water treatment function. The researcher of the thesis hopes that the above research results can be referential to the later researchers conducting the related studies of the heat exchange of nanofluids, energy saving and development of heat exchange work fluid with high performance.

參考文獻


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許育菁(2008)。奈米流體熱性質與熱儲存性能之研究〔碩士論文,國立臺北科技大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0006-2107200814500800
臧鶴年(2009)。光觸媒反應器應用於空調冷卻水水質處理之研究〔碩士論文,國立臺北科技大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0006-1707200909464800
張冠彥(2009)。三氧化二鋁奈米流體應用於板式熱交換器之性能研究〔碩士論文,國立臺北科技大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0006-2707200914021600
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