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博碩士論文 etd-0907108-153123 詳細資訊
Title page for etd-0907108-153123
論文名稱
Title
乳化液在彈液動潤滑接觸區之潤滑特性研究
Study on Lubricating Properties of Emulsions in EHL Contacts
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
125
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2008-07-26
繳交日期
Date of Submission
2008-09-07
關鍵字
Keywords
乳化液、彈液動潤滑
emulsion, elastohydrodynamic lubrication
統計
Statistics
本論文已被瀏覽 5645 次,被下載 1232
The thesis/dissertation has been browsed 5645 times, has been downloaded 1232 times.
中文摘要
本研究提出適用於彈液動潤滑之兩相可壓縮流體潤滑模型,以牛頓-瑞福遜法配合複式網格法同時求解油水兩相之等效雷諾方程式,並探討速度、負荷、材料參數、入口油相比、油滴半徑、表面張力群、混合物之彈性能、以及乳化液之等效黏度模型對於乳化液潤滑特性之影響。

本研究在低轉速、低濃度及高負載之應用範圍比以往的研究廣泛。結果顯示,在油滴半徑與速度效應方面,與Kimura等人及Zhu等人之實驗結果有良好的一致性,亦即油滴尺寸小於膜厚時,潤滑油膜厚度隨油滴尺寸之增加而增加;而低濃度乳化液於低轉速時,油相比在接近赫茲接觸區快速增加,亦即形成油池;隨著轉速增加,油池的範圍明顯地縮減,且在接觸區的油相比急遽下降,因而產生油膜厚度下降的情形;轉速愈高時,油水兩相皆進入接觸區而形成兩相流,此時在接觸區之油相比愈接近於入口之油相比。
Abstract
In this study, a model has been developed for the elastohydrodynamic lubrication with binary mixtures of compressible fluids, which can be used to represent emulsions with suspended deformable particles. The coupled modified Reynolds, elasticity, and rheology equations are solved simultaneously by combining the advanced multilevel method and the Newton-Raphson method. The effects of speed, load, dimensionlesss materials parameter, inlet oil volume fraction, droplet radius, surface tension group, elasticity of mixture, and equivalent viscosity models of emulsions on the lubrication characteristics of the emulsions are investigated.

The speed, load, and oil volume fraction combinations studied in this study represent a broad range of operating conditions previously not investigated. The results of this study are in good agreement with the tests conducted by Kimura et al. and Zhu et al. indicating the effects of droplet radius of oil phase and the speed on the film thickness. The film thickness increases with increasing droplet size for the droplet size smaller than the film thickness. At the low oil volume fraction and low speed, the oil volume fraction increases rapidly with coordinate x to form the oil pool in the region close to the Hertzian contact area. With the increase of speed, the extent of the oil pool decreases significantly so that the oil volume fraction at the contact area decreases rapidly. Consequently, the film thickness also decreases due to the decrease in the effective viscosity of the mixture. When the speed is getting higher, the oil and water phases enter the contact conjunction so that the oil volume fraction is closer to the inlet one.
目次 Table of Contents
總 目 錄
頁次
封面 i
學位論文審定書 ii
謝誌 iii
總目錄 iv
圖目錄 vii
表目錄 x
符號說明 xi
中文摘要 xiv
英文摘要 xv
第一章 緒論 1
1.1 乳化液概述 1
1.2 文獻回顧 2
1.2.1 乳化液之彈液動油膜實驗觀察 2
1.2.2 乳化液之潤滑理論分析 5
1.3 研究目的與方法 6
1.4 論文架構 6
第二章 理論分析 9
2.1 混合物之連體理論 9
2.1.1 運動學與基本方程式 10
2.1.2 平衡定律 13
2.1.2.1 質量平衡 13
2.1.2.2 線動量平衡 15
2.1.2.3 角動量平衡 17
2.1.2.4 能量平衡 18
2.1.2.5 熵生成不等式 21
2.1.3 構成分子理論 22
2.1.4 混合物的物理性質 25
2.2 線接觸彈液動潤滑理論 26
2.2.1 幾何形狀 27
2.2.2 雷諾方程式 28
2.2.3 潤滑膜厚方程式 31
2.2.4 負荷平衡方程式 33
2.2.5 潤滑流體性質 33
第三章 數值分析 37
3.1 複式網格法 37
3.1.1 修正法則 39
3.1.2 全近似法則 40
3.1.3 網格間運算子 42
3.1.4 全複式網格法則 44
3.2 統御方程式 45
3.2.1 無因次群 45
3.2.2 雷諾方程式 46
3.2.3 膜厚方程式 47
3.2.4 潤滑流體性質 48
3.2.5 負荷平衡方程式 48
3.3 修正牛頓-瑞福遜法 49
第四章 結果與討論 57
4.1  與實驗之比較 58
4.2  流體壓縮性之影響 60
4.3  乳化液入口油相比之影響 60
4.4  表面張力項 與彈性能 之影響 61
4.5 油水兩相黏度比例之影響 62
4.6 材料參數 之影響 62
4.7 負荷之影響 63 4.8 乳化液等效黏度模型 63
第五章 結論 104
5.1 結論 104
參考文獻 106
參考文獻 References
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