進階搜尋


下載電子全文  
系統識別號 U0026-3007201817451000
論文名稱(中文) 探討金屬絲對於脈動管流不穩定性的影響
論文名稱(英文) Effect of trip wire on flow instability in pulsating pipe flow
校院名稱 成功大學
系所名稱(中) 航空太空工程學系
系所名稱(英) Department of Aeronautics & Astronautics
學年度 106
學期 2
出版年 107
研究生(中文) 阮光輝
研究生(英文) Quang Huy Nguyen
學號 P46057179
學位類別 碩士
語文別 英文
論文頁數 100頁
口試委員 指導教授-苗君易
口試委員-呂宗行
口試委員-周榮華
口試委員-葉思沂
中文關鍵字 none 
英文關鍵字 Pulsating pipe flow  Hot-wire measurement  Rayleigh’s inflection point theorem  Trip wire 
學科別分類
中文摘要 none
英文摘要 The phenomenon which drastically influences fluid flow and appears the most in natural flow is the phenomena of turbulent flows. The flow phenomena play an integral part in a variety of fields, especially in fluid mechanics. Depending on the situation, one can base on the characteristics of turbulent flow to meet their requirements such as creating more energy or increasing mass transfer and mixing, since there has been the presence of eddies and vortices inside the flow. However, in some cases, one would like to maintain the state of fluid at laminar flow. For instance, the movement of blood flow is deemed to be laminar and researchers want to keep it flowing smoothly like this. The reason is due to the characteristics of fluid flow. When the state of fluid flow becomes turbulent, any disturbances can cause an obstruction of arterial blood; therefore, the supply of blood distributed to each cell is not satisfied with the need of tissue. Consequently, many researchers have investigated laminar-turbulence transition phenomena for a long time in order to learn about the process in detail. From that, one can illustrate some methods to control flow and make it adapt to distinct situations. Nevertheless, the process of a laminar flow becoming turbulent is complicated and still remains a controversy. The first important point to understand is to clarify the first signal, called as “initial instability”, and when it happens. Understanding the initial instability plays a crucial role in laminar-transient transition process and facilitates the awareness of the evolution from a small disturbance into a turbulent one and then manipulates fluid flow.
This study aimed to explore the initial instability in pulsating pipe flow and try to use trip wire to clarify the effects of the method. In addition, the characteristic of disturbance along the tube was also recognized. In the experiments, a hot wire anemometer was employed to measure the speed of fluid. A rotating disc was located at downstream to produce pulsating flow and the three main parameters which represented the pulsating flow condition are Womersley number α, Reu and Rem, respectively. In order to investigate the characteristic of intermittent disturbance component from original signal, a method called Empirical Mode Decomposition (EMD) was considered to extract the disturbance signal into a number of Intrinsic Mode Functions (IMFs). Moreover, the feature of each IMF was analyzed to get information of the disturbance frequency by the Hilbert-Huang Transform. In the analysis, the Rayleigh’s theorem successfully clarified the mechanism of the initial instability in a mixing layer. The theorem showed that the development of flow instability following the existence of inflexion point. The additional parameter which governed the state of fluid flow was trip wire. The factor which influenced the development of boundary thickness and was the one considered whether the change of flow instability was through installing and replacing with a series of different diameters or not. Furthermore, the travelling of disturbance over time was recognized from the cases studied. Finally, the analysis method which was mentioned above was used to analyze the data and have a comparison with the previous cases studied.
Key words: Pulsating pipe flow, Hot-wire measurement, Rayleigh’s inflection point theorem, Trip wire.
論文目次 ABSTRACT I
ACKNOWLEDGEMENTS III
INTRODUCTION IV
MATERIAL AND METHODOLOGY V
TABLE OF CONTENTS XX
LIST OF TABLES XXIII
LIST OF FIGURES XXIV
NOMENCLATURE XXVIII
CHAPTER ONE: INTRODUCTION 1
1.1 Research motivation and purpose 1
1.2 Literature review 2
1.2.1 Overview 2
1.2.2 Kinds of pipe flow 3
a) Steady flow 3
b) Unsteady flow 3
1.2.3 Inviscid instability mechanism 5
1.2.4 Viscous instability mechanism 6
1.2.5 Relaminarization 6
CHAPTER TWO: EXPERIMENTAL FACILITIES 9
2.1 Open circuit pipe system 9
2.2 Flow controller 9
2.3 Pressure taps 10
2.4 Pressure transducer 10
2.5 Water manometer 10
2.6 Hot-wire measurement 11
2.6.1 Hot-wire probe 11
2.6.2 Methodological connections 11
2.7 Trip wire 12
CHAPTER THREE: SPECIFICATIONS AND PROCESSING 13
3.1 Flow measurement method 13
3.2 Parameter specifications 13
3.2.1 Womersley number 13
3.2.2 Reu 14
3.2.3 Rem 14
3.2.4 Phase-averaged method 14
3.2.5 Phase lag 15
3.2.6 Curve fitting of velocity profile 15
3.2.7 Empirical Mode Decompostion (EMD) and Ensemble Empirical Mode Decomposition (EEMD) 15
3.2.8 Hilbert transform 17
3.2.9 Wavelet transform 17
3.2.10 Non-dimensional frequency calculation 18
3.2.11 Shape factor 19
CHAPTER FOUR: RESEARCH RESULTS 21
4.1 Description of flow field 21
4.2 Analysis for perturbation of initial disturbance 22
4.2.1 Comparison for growth disturbance in pulsating velocity 22
4.2.2 Comparison of phase velocity distribution in cases studied 24
4.2.3 Comparison of the phase delay distribution 25
4.2.4 The formation of the inflection point 26
4.2.5 Distribution of disturbance energy 27
4.2.6 Characteristic of disturbance frequency 30
4.2.7 Characteristic of non-dimensional frequency 31
4.3 Effect of trip wire on flow field 31
4.3.1 Travelling of disturbance 32
4.3.2 Development of boundary layer 35
CHAPTER FIVE: CONCLUSIONS AND SUGGESTIONS 37
5.1 Research Discussion and Conclusion 37
5.2 Future work 39
REFERENECE 40
參考文獻 [1] O. Reynolds, "An experimental investigation of the circumstances which determine whether the motion of water shall be direct of sinuous and of the law of resistance in parallel channels," Philosophical Transaction of the Royal Society of London, vol. 174, pp. 935-982, 1883.
[2] R. Tuzi and P. Blondeaux, "Intermittent turbulence in a pulsating pipe flow," Journal of Fluid Mechanics, vol. 599, pp. 51-79, 2008.
[3] M. Ohmi, M. Iguchi, and I. Urahata, "Transition to turbulence in a pulsatile pipe flow Part 1, Wave forms and distribution of pulsatile velocities near transition region," Bulletin of JSME, vol. 25, no. 200, pp. 182-189, 1982.
[4] M. Ohmi and M. Iguchi, "Transition to turbulence in a pulsatile pipe flow part 2, Characteristics of reversing flow accompanied by relaminarization," The Japan Society of Mechanical Engineers, vol. 25, no. 208, pp. 1529-1536, 1982.
[5] 羅洪森, "應 用 MEMS 熱 模 感 測 器 與 希 爾 伯 特 黃 轉 換 分 析," 脈 動 式 管 流 之 初 始 不 穩 定 現 象. 碩 士 論 文, 國 立 成 功 大 學, 2010.
[6] 劉昊, 脈 動 式 管 流 初 始 不 穩 定 之 現 象 探 討. 碩 士 論 文, 國 立 成 功 大 學, 2011.
[7] 戴君毅, 脈 動 式 管 流 初 始 不 穩 定 之 現 象 探 討. 碩 士 論 文, 國立成功大學, 2013.
[8] 簡廷瑋, 脈 動 式 管 流 初 始 不 穩 定 之 現 象 探 討. 碩 士 論 文, 國 立 成 功 大 學, 2014.
[9] 王仁暉, 脈 動 式 管 流 初 始 不 穩 定 現 象 研 究. 碩 士 論 文, 國 立 成 功 大 學, 2015.
[10] 徐晏婷, 脈 動 式 管 流 初 始 不 穩 定 現 象 研 究. 碩 士 論 文, 立 成 功 大 學, 2017.
[11] W. H. Reid and P. G. Drazin, Hydrodynamic stability. Cambridge Univ. Press, Cambridge, U. K. Chapter 2, 131, 1981.
[12] L. Rayleigh, "On the stability or instability of certain fluid motions," Proc. Lond. Maths. Soc, vol. 11, pp. 57-72, 1880.
[13] P. Huerre and P. Monkewitz, "Influence of the velocity ratio on the spatial instability of mixing layers," The Physics of Fluids, vol. 25, no. 7, pp. 1137-1143, 1982.
[14] R. M. Nerem, W. A. Seed, and N. B. Wood, "An experimental study of the velocity distribution and transition to turbulence in the aorta," Journal of Fluid Mechanics, vol. 52, part 1, pp. 137-160, 1972.
[15] S. Einav and M. Sokolov, "An Experimental Study of Pulsatile Pipe Flow in the Transition Range," Journal of Biomechanical Engineering, vol. 115, 4A, pp. 404-411, 1993.
[16] M. Gad-el-Hak and J. Mcmurray, "On the stability of the decelerating laminar boundary layer," Journal of Fluid Mechanics, vol. 138, pp. 297-323, 1984.
[17] M. Iguchi, M. Ohmi, and Y. Fujii, "Behavior of turbulent slug in a transient pipe flow," JSME International Journal, vol. 32, no. 3, pp. 340-347, 1989.
[18] J. J. Miau, R. H. Wang, T. W. Jian, and Y. T. Hsu, "An investigation into inflection-point instability in the entrance region of a pulsating pipe flow," Pro. R. Soc. Lond, 2017.
[19] M. Hino, M. Sawamoto, and S. Takasu, "Experiments on transition to turbulence in an oscillatory pipe flow," Journal of Fluid Mechanics, vol. 75, no. 2, pp. 193-207, 1976.
[20] S. He and J. D. Jackson, "A study of turbulence under conditions of transient flow in a pipe," Journal of Fluid Mechanics, vol. 408, pp. 1-38, 2000.
[21] B. R. Ramaprian, "Fully developed periodic turbulent pipe flow," Journal of Fluid Mechanics, vol. 137, pp. 59-81, 1983.
[22] N. Huang, Z. Shen, S. Long, M. Wu, H. Shih, Q. Zheng, N. Yen, C. Tung, and H. Liu, "The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis," Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, vol. 454, pp. 903-995, 1998.
[23] N. E. Huang, Z. Shen, and S. R. Long, "A new view of nonlinear water waves: The Hibert spectrum 1," Annual Review of Fluid Mechanics, vol. 31, no. 1, pp. 417-457, 1999.
[24] Z. Wu and N. E. Huang, "Ensemble empirical mode decomposition: A noise-assisted data analysis method," World Scientific, vol. 1, no. 1, pp. 1-41, 2009.
[25] M. A. Shockling, J. J. Allen, and A. J. Smiths, "Roughness effects in turbulent pipe flow," Journal of Fluid Mechanics, vol. 564, pp. 267-285, 2006.
[26] N. E. Huang and Z. Wu, "A review on Hilbert-Huang transform: Method and its applications to geophysical studies," Reviews of Geophysics, vol. 46, pp. 1-23, 2008.
[27] K. R. Sreenivasan, "Laminarescent, Relaminarizing and Retransitional Flows," Acta Mechanica, vol. 44, pp. 1-48, 1982.
[28] M. A. Badri Narayanan and V. Ramjee, "On the criteria for reverse transition in a two-dimensional boundary layer flow," Journal of Fluid Mechanics, vol. 35, part 2, pp. 325-241, 1969.
[29] P. Bradshaw, "A note on reverse transition," Journal of Fluid Mechanics, vol. 35, part 2 , pp. 387-390, 1969.
[30] R. Narasimha and K. R. Sreenivasan, "Relaminarization of Fluid Flows," Advances in Applied Mechanics, vol. 19, pp. 221-309, 1979.
[31] H. J. Obremski and A. A. Fejer, "Transition in oscillating boundary layer flows," Journal of Fluid Mechanics, vol. 29, pp. 93-111, 1967.
[32] L. Shemer, I. Wygnanski, and E. Kit, "Pulsating flow in a pipe," Journal of Fluid Mechanics, vol. 153, pp. 313-337, 1985.
[33] I. J. Wygnanski and F. H. Champagne, "On transition in a pipe. Part 1. The origin of puffs and slugs and the flow in a turbulent slug," Journal of Fluid Mechanics, vol. 59, no. 2, pp. 281-335, 1973.
[34] T. Sarpkaya, "Coherent structures in oscillatory boundary layers," Journal of Fluid Mechanics, vol. 253, pp. 105-140, 1993.
[35] V. B. Andrey, V. D. Alexander, R. G. Genrih, and V. K. Victor, Physics of transitional shear flows. Springer, 2012.
[36] H. B. Squire, "On the stability for three-dimensional disturbances of viscous fluid flow between parallel walls," Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, vol. 142, no. 847, pp. 621-628, 1933.
[37] F. M.White, Viscous fluid flow, third edit ed., 2006.
[38] P. Klebanoff, K. Tidstrom, and L. Sargent, "The three-dimensional nature of boundary-layer instability," Journal of Fluid Mechanics, vol. 12, no. 1, pp. 1-34, 1962.
[39] R. Narasimha and K. R. Sreenivasan, "Relaminarization in highly accelerated turbulent boundary layers," Journal of Fluid Mechanics, vol. 61, part 3, pp. 417-447, 1973.
[40] V. C. Patel, "Calibration of the Preston tube and limitations on its use in pressure gradients," Journal of Fluid Mechanics, vol. 23, part 1, pp. 185-208, 1965.
[41] L. Catherine and T. Antoniette, "The use of dimensionless wormersley number to characterize the unsteady nature of internal flow," Journal of Theoretical Biology, vol. 191, pp. 63-78, 1997.
[42] J. R. Womersley, "Method for the calculation of velocity, rate of flow and viscous drag in arteries when the pressure gradient is known," Journal of Physiol, vol. 127, pp. 553-563, 1955.
[43] S. Uchida, "The pulsating viscous flow superposed on the steady laminar motion of incompressible fluid in a circular pipe," Journal of the Physical Society of Japan, vol. 7, no. 5, pp. 403-422, 1956.
[44] W. Orr, "The stability or instability of the steady motions of a perfect liquid and of a viscous liquid," Proceedings of the Royal Irish Academy. Section A, vol. 27, pp. 9-68, 1907.
[45] A. Sommerfeld, "Ein beitrag zur hydrodynamischen erklaerung der turbulenten fluessigkeitsbewegungen," Proceedings of the 4th International Congress of Mathematicians III, vol. 3, pp. 116-124, 1908.
[46] L. Prandtl, "Bemerkungen über die Entstehung der Turbulenz," Journal of Applied Mathematics and Mechanics, vol. 1, pp. 431-436, 1921.
[47] D. Apsley. (2009). Turbulent Boundary-layer theory.
[48] M. Iguchi and M. Ohmi, "Transition to turbulence in a pulsatile pipe flow (3rd Report, Flow regimes and the Conditions Decribing the Generation and Decay of Turbulence)," JSME International Journal, vol. 27, no. 231, pp. 1873-1880, 1984.
[49] S. J. Kline, W. C. Reynolds, F. A. Schraub, and P. W. Runstadler, "The structure of turbulent boundary layers," Journal of Fluid Mechanics, vol. 30, part 4, pp. 741-773, 1967.
[50] H. Fiedler and M. R. Head, "Intermittency measurements in the turbulent boundary layer," Journal of Fluid Mechanics, vol. 25, part 4, pp. 719-735, 1966.
[51] V. C. Patel and M. R. Head, "Reversion of turbulent to laminar flow," Journal of Fluid Mechanics, vol. 34, part 2, pp. 371-392, 1968.
論文全文使用權限
  • 同意授權校內瀏覽/列印電子全文服務,於2018-08-30起公開。
  • 同意授權校外瀏覽/列印電子全文服務,於2018-08-30起公開。


  • 如您有疑問,請聯絡圖書館
    聯絡電話:(06)2757575#65773
    聯絡E-mail:etds@email.ncku.edu.tw