跳到主要內容

臺灣博碩士論文加值系統

(18.97.14.86) 您好!臺灣時間:2025/02/20 06:40
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

: 
twitterline
研究生:梁怡詩
研究生(外文):I-shih Liang
論文名稱:微氣軸承內薄膜滑移流動特性之分析
論文名稱(外文):Analysis of Thin-Film Slip Flow Characteristics in Micro Gas Bearings
指導教授:宋齊有
學位類別:碩士
校院名稱:逢甲大學
系所名稱:航太與系統工程所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:74
中文關鍵詞:滑移微氣軸承溫度跳躍常物性流變物性流
外文關鍵詞:temperature jumpthin-film flowvelocity slipslider bearing
相關次數:
  • 被引用被引用:1
  • 點閱點閱:251
  • 評分評分:
  • 下載下載:37
  • 收藏至我的研究室書目清單書目收藏:0
本研究以高轉速氣軸承中的超薄氣膜流體力學分析為目標,以二維平面滑動軸承(Planar Slider Bearing)模型,考慮氣膜流動為滑移流(Slip Flow),採用速度滑移(Velocity Slip)與溫度跳躍(Temperature Jump)邊界條件分析常物性(Constant-Property)與變物性(Variable-Property)氣膜流動特性。常物性流速與溫度解析解求出後,再代入Picard迭代 (Picard’s Iteration) 求變物性條件下之速度與溫度逼近解。本研究與以往文獻主要不同的地方為:(1)考慮微氣軸承高速旋轉下,黏性耗散(Viscous Dissipation)產生之溫升對熱流特性之影響;(2)考慮軸承潤滑薄膜兩流-固介面邊界之滑移條件不同,並藉由所得之逼近解對微氣軸承內薄膜滑移流動之特性進行分析。研究結果顯示溫度梯度造成物理性質改變以及兩邊界不同速度滑移與溫度跳躍之考慮均對微尺度氣膜流動特性有明顯的影響。
The purpose of the present study is to analyze the fluid dynamics of the extra thin-film flow in high rotational speed gas bearings. Two-dimensional slip flow in slider bearing model with boundary conditions of velocity slip and temperature jump is employed to analyze thermal fluid characteristics of constant- and variable property flows. The approximate velocity and temperature solutions at variable-property conditions are found by substituting the analytic solutions into Picard’s iteration formulas. The difference between the present and the previous works are the considerations of (1) the influences of temperature rise due to viscous dissipation on the thermal-fluid characteristics, and (2) the slip conditions at two solid-fluid interfaces of the thin-film flow in the bearing are different. With the approximate solutions, the thin-film slip flows in micro gas bearings are analyzed. The present results demonstrate the changes in physical properties due to the temperature gradient and the different conditions of velocity slip and temperature jump at two boundaries both have noticeable effects on the thermal-fluid dynamics of microscale gas film flows.
致謝 i
摘要 ii
ABSTRACT iii
目錄 iv
表錄 viii
符號說明 ix
第一章:序論 1
1.1研究背景 1
1.2 文獻回顧 2
1.3 本研究之目的 5
第二章:二維氣軸承薄膜流理論分析 7
2.1 物理模型 7
2.2 二維氣軸承薄膜流統御方程式 8
2.3 統御方程式之無因次化 9
2.4 量階分析 13
2.5 稀薄氣流邊界條件 21
第三章:常物性薄膜流場解 24
3.1 常物性流之速度分佈 24
3.2 常物性流之溫度分佈 26
第四章:變物性薄膜流場解 29
4.1 變物性之速度分佈 29
4.2 變物性流之溫度分佈 35
第五章:結果與討論 45
5.1常物性流速度與溫度解 45
5.2變物性流速度與溫度解 54
5.3變物性流流量分佈解 63
第六章:結論 67
參考文獻 68
附錄一、空氣物理性質經驗公式 72
Ahn, J. C., Mavriplis, C., Goulard, R., 1996, “Heat Transfer and Flow Fields in Microchannels Using the DSMC Simulation Method,” AIAA, Vol. 11, No. 4, pp. 489-496.
Alexander, F. J., Garcia, A. L. and Alder, B. J., 1994, “Direct Simulation Monte Carlo for Thin-Film Bearings,” Phys. Fluids, Vol. 6, pp. 3854-3860.
Bahukudumbi, P. and Beskok, A., 2003, “A Phenomenological Lubrication model for the Entire Knudsen Regime,” J. Micromech. Microeng., Vol. 13, pp. 873-884.
Baka, E., 2002, ”Calculation of the Hydrodynamic Load Carrying Capacity of Porous Journal Bearings,” Periodica Polytechnica Ser. Mech. Eng., Vol. 46, No. 1, pp. 3-14.
Burgdorfer, A., 1959, “The Influence of the Molecular Mean FREE Path on the Performance of Hydrodynamic gas Lubricated Bearing,” ASME J. Basic Eng., Vol. 81, pp. 94-99.
Chen, C. S., Lee, S. M., and Sheu, J. D., 1998, “Numerical Analysis of Gas Flow in Microchannels,” Num. Heat Transfer A, Vol. 33, pp. 749-762.
Dadouche, A., Fillon, M. and Bligoud, J.C., 2000,”Experiments on Thermal Effects in a Hydrodynamic Thrust Bearing,” Tribology International, Vol. 33, pp. 167-174.
Fourka, M.,Tian, Y. and Bonis, M., 1996,”Prediction of the Stability of Air Thrust Bearings by Numerical, Analytical and Expermental Methods,” Wear, Vol. 198, pp. 1-6
Fourka, M. and Bonis, M., 1997,”Comparison between Externally Pressurized Gas Thtust Bearings with Different Orifice and Porous Feedinf Systems,” Wear, Vol. 210, pp.311-317
Lin, C.-C., Ghodssi, R., Ayon, A.A., Chen, D.Z., Jacobson, S.A., Breuer, K.S., Epstein, A.H. and Schmidt, M.A., 1999,”Fabrication and Characterization of a Micro Turbine/Bearing Rig,” Proc. IEEE International Micro Electro Mechanical Systems Conference, Orlando, FL, USA.
Liu, N. and Ng, Y. K., 2001, “The posture effects of a slider air bearing on its performance with a direct simulation Monte Carlo method,” J. Micromech. Microeng., Vol. 11, pp. 463–473.
Loyalka, S. and Hamoodi, S., 1990, “Poiseuille Flow of a Rarefied Gas in a Cylindrical Tube: Solution of Linearized Boltzmann Equation,” Phys. Fluids A, Vol. 2, pp. 2061–2065.
Nance, R. P., Hash, D. B., and Hassan, H. A., 1998, “Role of Boundary Condition in Monte Carlo Simulation of Microelectromechanical Systems,” J. Thermophysic Heat Transfer, Vol. 124, pp. 356-364.
Ng, Y. K. and Liu, N., 2002, ”Stress-Density Ratio Slip-Corrected Reynolds Equation for Ultra-Thin Film Gas Bearing Lubrication,” J. Micromech. Microeng., Vol. 14, No. 4 pp. 1450-1457.
Ng, Y. K. and Liu, N., 2005, “A Multicoefficient Slip-Corrected Reynolds Equation for Micro-Thin Film Gas Lubrication,” Int. J. Rotating Machinery, Vol. 14, pp. 105-111.
Oh, C. K., Oran, E. S., and Sincovits, R. S., 1997, “Computations of High-Speed High Knudsen Number Microchannel Flows,” J. of Thermophysic Heat Transfer, Vol. 11, pp. 497-505.
Ohwada, T., Sone, Y. and Aoki, K., 1989, “Numerical Analysis of the Poiseuille and Thermal Transpiration Flows Between Two Parallel Plates on the Basis of the Boltzmann Equation for Hard Sphere Molecules,” Phys. Fluids, Vol. 1, pp. 2042–2049.
Ren, L., Zhu, K. Q. and Wang, X. L., 2003, “Effects of the Slip Velocity Boundary Condition on the Characteristics of Microbearings,” J. Micromech. Microeng., Vol. 14, pp. 114-124.
Sun, H., and Faghri, M., 2000, “Effect of Rarefaction and Compressibility of Gaseous Flow in Microchannels Using DSMC,” Numerical Heat Transfer, Part A, Vol. 38, pp. 153-168.
Yan, F. and Farouk, B., 2002, “Computations of Low Pressure Flow and Heat Transfer in Ducts Using the Direct Simulation Monte Carlo Method,” J. of Thermophysic Heat Transfer, Vol. 124, pp. 609-616.
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top