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DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳炳煇(Ping-Hei Chen) | |
dc.contributor.author | Hung-Hsia Chen | en |
dc.contributor.author | 陳虹遐 | zh_TW |
dc.date.accessioned | 2021-06-16T04:07:04Z | - |
dc.date.available | 2014-09-12 | |
dc.date.copyright | 2014-09-12 | |
dc.date.issued | 2014 | |
dc.date.submitted | 2014-08-29 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/55519 | - |
dc.description.abstract | 本文主要探討各種濃度、粒徑之二氧化矽奈米流體,於池沸騰實驗前後的水平純銅加熱表面熱傳性質。文中將工作流體與加熱面的組合分為「1-純水-純銅」、「2-奈米流體-純銅」以及「3-純水-奈米修飾銅」三種組合。
工作流體是以二階混合法製作三種不同粒徑(10nm、25nm、50nm)、五種不同濃度(0.005~0.1wt%)的二氧化矽奈米顆粒和純水製作奈米流體,在一大氣壓與水平純銅加熱面進行過冷態池沸騰實驗。 由於各種粒徑大小、濃度變化在銅加熱表面堆疊的孔洞、厚度、粗糙度也會不同,因此熱傳特性會受到影響。研究結果發現加熱表面的平均粗糙度、粒徑交互作用下,「2-奈米流體-純銅」的臨界熱通量會比「1-純水-純銅」還高103%,而「3-純水-奈米修飾銅」的臨界熱通量則是比「1-純水-純銅」還高88%。但是「2-奈米流體-純銅」、「3-純水-奈米修飾銅」兩種表面的平均熱傳係數有部分呈現大幅增加而部分卻變得比純水差。 | zh_TW |
dc.description.abstract | Critical heat fluxes (CHF) and boiling heat transfer coefficient (BHT) are the primary concerned properties in the design of electrical component cooling or nuclear reactor.
Various concentrations and particle sizes of suspension SiO2 nanoparticles in pure water, called nanofluids, were manipulated in subcooled pool boiling experiment in this study. After nanofluids boiling experiment, the porous nano-coated surfaces were boiling again with pure water in pool. During boiling, nanoparticles in the nanofluids deposit on the bare copper heater surface continuously, which is porous and hydrophilic, leading to a higher CHF compared to pure water. The results showed that all the CHF of plain surfaces with nanofluids and nano-coated surface with pure water experiments were enhanced significantly compared with pure water. It also showed that part of the BHT of bare surface and nanocoated surface were improved but also some of them were deteriorated compared with pure water. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T04:07:04Z (GMT). No. of bitstreams: 1 ntu-103-D98522012-1.pdf: 5071349 bytes, checksum: a2c44ad99688f2dd11754797371a2f41 (MD5) Previous issue date: 2014 | en |
dc.description.tableofcontents | 目錄
第一章 前言 1 1.1. 研究動機與背景 1 1.2. 論文章節簡介 3 1.3. 研究目的 4 第二章 文獻回顧 5 2.1. 沸騰熱傳簡介 5 2.1.1 池沸騰曲線圖 5 2.1.2 池沸騰熱傳相關理論 8 2.2. 改變沸騰熱傳的技術簡介 11 2.3. 加熱表面特性對沸騰熱傳的影響 12 2.3.1. 結構加熱面 (Structured Surfaces)對沸騰熱傳的影響 12 2.3.2. 奈米修飾加熱表面(Nano-coated Surfaces)對沸騰熱傳的影響 13 2.3.3. 奈米流體顆粒沈積的加熱表面相關研究 17 2.4. 影響奈米流體沸騰熱傳參數 22 2.4.1 奈米流體濃度 23 2.4.2 奈米顆粒與工作流體的熱傳導係數 25 2.4.3 奈米顆粒大小形狀與粒徑分佈 28 2.4.4 加熱面材質 32 2.4.5 其他參數 33 2.5. 奈米流體沸騰熱傳特性的研究趨勢與目標 34 第三章 研究方法 35 第四章 實驗設備與誤差分析 38 4.1 儀器與藥品 38 4.1.1 實驗設備 38 4.1.2 誤差分析與實驗數據計算 42 4.1.3 量測設備 43 4.1.4 實驗材料與設備 44 4.2 實驗樣品前置處理 46 第五章 實驗結果與討論 48 5.1 純水與純銅表面 48 5.2 各種濃度、粒徑的奈米流體與純銅表面 50 5.2.1 濃度、粒徑對接觸角的影響 50 5.2.2 奈米修飾銅的表面形貌 51 5.2.3 沈積厚度的影響 52 5.2.4 表面粗糙度的影響 54 5.2.5 不同濃度的影響 56 5.2.6 平均粗糙度、粒徑、濃度對平均熱傳係數的影響 58 第六章 結論與建議 62 6.1 結論 62 6.2 未來工作 64 | |
dc.language.iso | zh-TW | |
dc.title | 利用池沸騰所改質表面的沸騰熱傳特性之研究 | zh_TW |
dc.title | Investigation of Boiling Heat Transfer Properties On a Nano-coating Surface Modified by Pool Boiling | en |
dc.type | Thesis | |
dc.date.schoolyear | 102-2 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 康尚文(Shung-Wen Kang),卓清松(Ching-Song Jwo),李達生(Das-Sheng Lee),張天立(Tien-Li Chang) | |
dc.subject.keyword | 奈米修飾銅表面,粒徑大小,臨界熱通量,沸騰熱傳係數, | zh_TW |
dc.subject.keyword | Nano-coated surface,Particle size,Critical heat fluxes,Boiling heat transfer coefficient, | en |
dc.relation.page | 74 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2014-09-01 | |
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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