Responsive image
博碩士論文 etd-0801114-094934 詳細資訊
Title page for etd-0801114-094934
論文名稱
Title
熱效應對乳化液的混合油膜潤滑之創新模型研究
Thermal Effect on a Mixed-Film Lubrication with Oil-in-Water Emulsions
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
83
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
2014-07-28
繳交日期
Date of Submission
2014-09-01
關鍵字
Keywords
滾滑比、吸附油層、乳化液、熱彈液動潤滑
adsorbed layer, slide/roll ratio, emulsion, thermal EHL
統計
Statistics
本論文已被瀏覽 5637 次,被下載 19
The thesis/dissertation has been browsed 5637 times, has been downloaded 19 times.
中文摘要
本研究提出一含兩吸附油層之乳化液熱彈液動潤滑的創新模型,推導及求解油水兩相之修正雷諾氏方程式及能量方程式,並探討油相濃度、滾滑比、吸附油層厚度及負荷對乳化液潤滑特性之影響。
結果顯示在一定吸附層厚度條件下,乳化液之油相濃度增加,乳化液層、吸附油層及表面溫度亦隨之增加,但是其溫昇遠小於純油之溫昇,這是由於純油有較高的剪力加熱。在彈液動潤滑情況下,因為吸附油層之速度變化非常小,使其產熱較小,所以乳化液層溫度會高於吸附油層溫度。有吸附油層之金屬表面溫昇會高於無吸附油層之溫昇,這是由於有吸附油層相當於有熱阻,阻止熱量傳遞金屬表面,且隨吸附油層厚度增加,最大平均溫昇量只有些微的增加。油膜的最大平均溫昇量隨著滾滑比及負荷之增加而增加,而最小油膜厚度即隨其增加而下降。
Abstract
A mixed-film model with two adsorbed layers on the solid surfaces and an emulsion layer between them is proposed to explain the lubrication mechanism of emulsion for thermal elastohydrodynamic lubrication (TEHL). In this study, the modified Reynolds and energy equations are derived and solved simultaneously by the Newton-Raphson method. Effects of the oil concentration, slide/roll ratio, adsorbed layer thickness and load on the lubrication characteristics of the emulsion are investigated.
Results show that the greater oil concentration, the greater mean temperature rise of the film under a certain of thickness of the adsorbed layer. However, the mean temperature rise of the film is less than that of the pure oil due to higher shear heating of the pure oil. Since the variation of the velocity across the film of the adsorbed layer is very small, the shear heating generated by the adsorbed oil is very small. Consequently, the mean temperature of the adsorbed layer is less than that of the emulsion layer. The mean temperature rise of the solid surface with the adsorbed layer is higher than that without the adsorbed layer due to the lower heat conductivity of the adsorbed oil to insulate the heat flux across the film. Furthermore, the maximum mean temperature rise slightly increases along with the thickness of adsorbed layer. The maximum mean temperature rise increases along with the slide/roll ratio and load, but the minimum film thickness decreases with increasing slide/roll ratio and load.
目次 Table of Contents
誌 謝 i
摘 要 ii
Abstract iii
目 錄 iv
圖 次 vi
表 次 viii
符號說明 ix
第一章 緒論 1
1.1 研究動機 1
1.2 乳化液概述 1
1.3 文獻回顧 2
1.3.1 乳化液之油膜實驗觀察 2
1.3.2 乳化液之潤滑理論分析 3
1.3.3 彈液動潤滑之熱效應理論研究 5
1.4 論文架構 5
第二章 理論模型 9
2.1 雷諾氏方程式 9
2.2 能量方程式 16
2.3 表面溫度及界面溫度 26
2.4 乳化液之黏度模型 27
2.5 計算流程 28
第三章 結果與討論 36
3.1 純乳化液之潤滑特性 36
3.2 含下吸附油層之乳化液的潤滑特性 37
3.3 含上、下吸附油層之混合油膜的潤滑特性 38
第四章 結論與未來展望 64
4.1 結論 64
4.2 未來展望 65
參考文獻 66
參考文獻 References
[1] M. H. A. Spikes and R. Hoogendoorn, The design of lubrication oil-in-water emulations. .Proc.Instn.Mech.Engrs, 1997. 211: p. 195-208.
[2] A. J. M. Benito, C. Pazos, J. Coca, M. Ratoi-salagean, and H. A. Spikes, The effect of emulsifier concentration on lubricating properties of oil-in-water emulsions. Tribol. Letters, 2006. 22: p. 53-65.
[3] D. Zhu, G. Biresaw, S. J. Clark, and T. J. Kasun, Elastohydrodynamic lubrication with O/W emulsions. Trans. ASME, J. Triboligy, 1994. 116: p. 310-319.
[4] S. R. Schmid and W. R. D. Wilson, Lubrication mechanisms for oil-in-water emulsions. STLE, 1995. 52: p. 168-175.
[5] Y. Sakaguchi, W. R. D. Wilson, and S. R. Schmid, A dynamic concentration model for lubrication with oil-in-water emulsions. Wear, 1993. 161: p. 207-212.
[6] Fujita N. and Kimura Y., Influence of plate-out oil film on lubrication characteristics in cold rolling. ISIJ International, 2012. 52: p. 850-857.
[7] A. Al-Sharif, K. Chamniprasart, K. R. Rajagopal, and A. Z. Szeri, Lubrication with Binary Mixtures:Liquid-Liquid Emulsion. ASME J. Tribol., 1993. 115: p. 46-55.
[8] S. H. Wang, A. Al-Sharif, K. R. Rajagopal, and A. Z. Szeri, Lubrication with Binary Mixtures:Liquid-Liquid Emulsion in an EHL Conjunction. ASME J. Tribol., 1993. 115: p. 515-522.
[9] S. Yan and S. Kuroda, Lubrication with Emulsion:First Report, the Extended Reynolds Equation. Wear, 1997: p. 230-237.
[10] S. Yan and S. Kuroda, Lubrication with Emulsion II. The Viscosity Coefficients of Emulsions. Wear, 1997. 206: p. 238-243.
[11] J. Benner, Sadeghi, Hoeprich R., and C. Frank, Lubricating Properties of Water in Oil Emulsions. J. Tribol., 2006. 128: p. 296-310.
[12] Wang S.H., Szeri A.Z., and Rajagopal K.R., Lubrication with emulsions in cold rolling. J Tribology, 1993. 115: p. 523-531.
[13] A.Z. Szeri and S.H. Wang, An elasto-plasto-hydrodynamic model of strip rolling with oil/water emulsion lubricant. Tribol., 2004. 37: p. 169-176.
[14] P.M. Lugt and W.E. Napel, The influence of elastic deformation of the roll and thee the sheet in a hydrodynamically lubricated cold rolling process. J Tribol., 1995. 117: p. 468-475.
[15] S.W. Lo, K. C. Huang, and M. C. Zhou, CFD Study on Oil-in-Water Emulsions. STLE Tribol. Trans., 2009. 52: p. 66-72.
[16] S.W. Lo, T. C. Yang, Y. A. Cian, and K. C. Huang, A Model for Lubrication by Oil-in-Water Emulsions. ASME, J. Tribol., 2010. 132: p. 011801-1-011801-9.
[17] R. T. Lee, K. T. Yang, and Y. C. Chiou, A novel model for a mixed-film lubrication with oil-in-water emulsions. Tribology International 2013. 66: p. 241-248.
[18] A.K. Tieu, P.B. Kosasih, and A. Godbole, A thermal analysis of strip-rolling in mixed-film lubrication with O/W emulsions. Tribology International, 2006. 39: p. 1591-1600.
[19] A.A. Tseng, Thermal characteristics of roll and strip interface in modeling rolling processes. J Mater Process Manuf Sci, 1997. 6: p. 3-17.
[20] C. H. Hsu and R. T. Lee, An Efficient Algorithm for Thermal Elastohydrodynamic Lubrication Under Rolling/Sliding Line Contacts. J. Tribol., 1994. 116: p. 762-769.
[21] R. T. Lee and C. H. Hsu, A fast method for the analysis of thermal-elastohydrodynamic lubrication of rolling/sliding line contacts. Wear, 1993. 166: p. 107-117.
[22] R. T. Lee and C. H. Hsu, Advanced multilevel solution for thermal-elastohydrodynamic lubrication of simple sliding line contacts. Wear, 1994. 171: p. 227-237.
[23] R. J. Atkin and R. E. Craine, Continuum theories of mixtures: basic theory and historical development. Quarterly Journal of Mechanics and Applied Mathematics, 1976. 29: p. 209.
[24] R. J. Atkin and R. E. Craine, Continuum theories of mixtures: applications. Journal of the Institute of Mathematical Applications, 1976. 17: p. 153-207.
[25] H. S. Carslaw and J. C. Jaeger, Conduction of Heat in Solid. 1959, Oxford: Oxford University Press.
[26] R. Sampio and W. O. Williams, On the Viscosities of Liquid Mixtures. Journal of Applied Mathematics and Physics, 1977. 28: p. 607-614.
[27] G Dalmaz and M. Godet, Film Thickness and Effective Viscosity of Some Fire Resistant Fluids in Sliding Point Contact. Transactions of ASME,Journal of Lubrication Technology, 1978. 100: p. 304-308.
電子全文 Fulltext
本電子全文僅授權使用者為學術研究之目的,進行個人非營利性質之檢索、閱讀、列印。請遵守中華民國著作權法之相關規定,切勿任意重製、散佈、改作、轉貼、播送,以免觸法。
論文使用權限 Thesis access permission:自定論文開放時間 user define
開放時間 Available:
校內 Campus: 已公開 available
校外 Off-campus: 已公開 available


紙本論文 Printed copies
紙本論文的公開資訊在102學年度以後相對較為完整。如果需要查詢101學年度以前的紙本論文公開資訊,請聯繫圖資處紙本論文服務櫃台。如有不便之處敬請見諒。
開放時間 available 已公開 available

QR Code