本研究使用一含兩吸附油層及乳化液層之混合油膜模型進行一系列模擬分析，提出一演算法解決各界面間之熱傳問題，簡化熱彈液動潤滑模型以節省計算時間，此模型能在減少大量且繁複的推導之下，有效模擬乳化液之潤滑狀況。本研究旨在探討乳化液性質對潤滑性能之影響，利用此吸附油層厚度及各種操作條件探討滑動條件下熱彈液動潤滑行為，了解其在接觸區之溫昇與潤滑特性，首先探討油相濃度、基礎油種類、乳化劑濃度及其酸鹼值對起始吸附油層的厚度的影響，與現有實驗量測值比較，並提出一簡化公式估算吸附油層厚度。起始吸附油層厚度隨油相濃度和基礎油黏度增加而增加，隨酸鹼值與乳化劑濃度增加而減少，因為低酸鹼值與低乳化劑濃度乳化液使乳化液不穩定，易在金屬表面形成吸附油層，然而隨轉速增加二者之起始吸附層厚度差異變小。基礎油種類顯著影響吸附油層厚度，合成油SHF41濕潤能力最差使得其起始吸附油層厚度最低。當上下固體表面之轉速不同時，滑動主要發生在乳化液層而吸附油層則只有微小滑動，乳化液層也因此承受黏性剪力作用而產熱，故最大溫昇發生在乳化液層。速度較快的固體表面與其吸附油層之溫昇較小，因為其在接觸區吸收熱量時間較短所致。最大平均溫昇隨著滾滑比、平均轉速、負荷油相濃度與基礎油黏度增加而昇高，較厚之吸附油層具有較高之平均溫昇，此乃由於吸附油層具有可阻止熱量散失之能力。最小油膜厚度隨負荷及滾滑比增加而減少，但會隨油相濃度、基礎油黏度與平均轉速增加而增加。

A mixed-film model with two adsorbed oil layers on the solid surfaces and an emulsion layer between them is proposed to conduct simulation. An algorithm is also proposed to solve the heat transfer problem between the interfaces along them. A model for the thermal elastohydrodynamic lubrication (TEHL) is simplified to save the computing time and to investigate the effects of emulsion parameters and operating conditions on the lubrication performances. The effects of oil phase concentration, base oil type, emulsifier concentration and pH value on the thickness of the initial adsorbed oil layer are investigated. Compared with the existing experimental measurements, a simplified formula is proposed to estimate the thickness of the adsorbed oil layer. The initial adsorbed oil layer thickness increases with the oil concentration and the viscosity of the base oil, but decreases with the increase of the pH value and the emulsifier concentration because the low pH value and the low emulsifier concentration emulsion make the emulsion unstable, so that it is easy to form the adsorbed oil layer on the solid surface. However, the effects of oil phase concentration, base oil type, emulsifier concentration and pH value on the thickness of the adsorbed oil layer become smaller with increasing speed. The base oil species significantly affect the thickness of the adsorbed oil layer, and the wetting ability of the synthetic oil SHF41 is the worst. When the upper and lower solids have different speeds, the sliding occurs mainly in the emulsion layer, and the adsorbed oil layer is only slightly sliding. The emulsion layer is subjected to viscous shear force to generate heat, so the maximum temperature rise occurs in the emulsion layer. The temperatures of the faster solid surface and its adsorbed oil layer are smaller because the surface absorbs heat in the contact zone for a relatively short time. The maximum average temperature rise increases with increasing oil concentration, base oil viscosity, rolling ratio, average speed and load, and the thicker adsorbed oil layer has a higher average temperature rise, which is due to the ability of the adsorbed oil layer to prevent heat dissipation. The minimum oil film thickness decreases with increasing load and roll ratio, but increases with oil concentration, base oil viscosity and average speed increase.

論文審定書 i
誌謝 ii
摘　要 iii
Abstract iv
目　錄 vi
圖　次 vii
表　次 ix
符號說明 x
第一章 緒論 1
1.1 研究動機 1
1.2 文獻回顧 2
1.3 論文架構 8
第二章 理論模型 13
2.1 統御方程式 13
2.2 簡化之統御方程式 22
2.3 以新的演算法求解表面溫度及界面溫度 26
2.6計算方法與流程 28
第三章 結果與討論 30
3.1 新演算法對表面及界面溫昇之影響 30
3.2 簡化模型與原模型之比較 37
3.3乳化液性質對起始吸附層厚度之影響 41
3.4操作參數對乳化液潤滑特性之影響 51
3.5基礎油黏度效應 64
第四章 結論與未來展望 66
4.1 結論 66
4.2 未來展望 67
參考文獻 68

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