物質在溫度變化及相變化的過程中都伴隨著熱量的傳遞，溫度上的變化為顯熱熱傳，相變化則為潛熱熱傳，因為物質在相變化的過程中維持相同的溫度。相變化分類中，水汽在冷壁面上的結霜是製冷及低溫領域普遍存在的問題，多數的研究都往此方面進行分析。本文以銅板表面低於攝氏零度產生結霜現象，並調整環境中乾、溼球溫度來觀察不同粗糙度表面對熱傳的差異。研究結果顯示，疏水性較高的表面，其熱交換的效率會較高，而同一表面在不同溼度下，相對溼度越高其熱通量越低，而表面粗糙度值改變的影響略大於相對濕度對結霜特性的影響。

In this study, effect of surface conditions, including roughness and coating, on the frosting phenomenon is investigated. The surface conditions provide both hydrophilic and hydrophobic conditions which may result in significant difference in the frosting phenomenon. Tests are performed in an environmental chamber with temperature being lower than the freezing point. The associated heat transfer coefficients subject to various ambient temperatures are also reported in this study. The results show that when the surface is more hydrophobic, the corresponding heat transfer is better. It is also found that the heat tranfer rate of the same surface is lower at higher relative humidity condition of the environment and that the effect of surface roughness is more dominant than that of relative humidity of the environment.

書名頁 ………………………………………………………………… i
論文口試委員審定書 ………………………………………………… ii
授權書 ……………………………………………………………… iii
中文提要 ……………………………………………………………… iv
英文提要 ……………………………………………………………… v
誌謝 …………………………………………………………………… vi
目錄 ………………………………………………………………… vii
表目錄 ……………………………………………………………… viii
圖目錄 ……………………………………………………………………ix
符號說明 ……………………………………………………………… x
第一章 緒論 1
1.1前言 1
1.2研究動機與目的 1
1.3文獻回顧 2
1.4本文架構 11
第二章 實驗設備與方法 13
2.1 實驗環境規劃 13
2.2實驗設備 14
2.3 實驗步驟與方法 23
2.4 量測數據計算 24
2.5 誤差分析 26
第三章 表面接觸角 29
3.1接觸角量測 29
第四章 結果與討論 32
4.1不同接觸角之表面數據比較 32
4.2表面結霜情況 43
第五章 結論與未來展望 48

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