پیوندهای مفید
آمار
| تعداد نشریات | 8 |
| تعداد شماره‌ها | 427 |
| تعداد مقالات | 5,557 |
| تعداد مشاهده مقاله | 6,708,171 |
| تعداد دریافت فایل اصل مقاله | 5,669,549 |
مطالعه‌ی آزمایشگاهی اثر چرخش جت سیال بر پرش‌های هیدرولیکی دایروی | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 3، دوره 53، شماره 7، مهر 1400، صفحه 4153-4170 اصل مقاله (2.54 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2020.18409.6811 | ||
| نویسندگان | ||
| علی اسدی1؛ سید مجید ملک جعفریان* 2؛ علیرضا تیمورتاش3 | ||
| 1دانشگاه بیرجند | ||
| 2Shahid Avini | ||
| 3گروه مکانیک دانشگاه فردوسی مشهد | ||
| چکیده | ||
| هرگاه یک جت سیال متقارن محوری به صورت عمودی به یک صفحه‌ی هدف افقی برخورد کند، یک پرش هیدرولیکی شکل می‌گیرد. مطالعات زیادی در زمینه‌ی پرش‌های هیدرولیکی دایروی انجام شده‌است. اما تاکنون هیچ گاه اثر پارامتر مهم و کلیدی چرخش جت سیال در پرش‌های هیدرولیکی مورد توجه قرار نگرفته‌است. هدف اصلی در این تحقیق مطالعه‌ی اثر چرخش جت سیال بر پدیده‌ی پرش هیدرولیکی دایروی است. نتایج این تحقیق که به کمک روش آزمایشگاهی بدست‌آمده‌است، نشان می‌دهد هر چه قدر سرعت زاویه‌ای بیشتر شود، میزان افزایش شعاع پرش دایروی بیشتر می‌شود. ترسیم نمودار شعاع بی‌بعد پرش بر اساس عدد بی‌بعد چرخش نشان می‌دهد که دو دسته خطوط قابل شناسایی است. دسته‌ی اول خطوط سرعت زاویه‌ای ثابت با شیب منفی و دسته‌ی دوم خطوط دبی ثابت با شیب مثبت است. نتایج نشان داد که افزایش سرعت زاویه‌ای جت چرخشی نسبت به افزایش دبی سیال اثر کمتری بر افزایش شعاع پرش هیدرولیکی دایروی دارد. همچنین آزمایشات نشان می‌دهد که پرش‌های هیدرولیکی ایجادشده به وسیله‌ی یک جت چرخشی، با کمی اختلاف از روند نتایج تئوری اصلاح شده‌ی واتسون پیروی می‌کند. | ||
| کلیدواژه‌ها | ||
| پرش هیدرولیکی دایروی؛ جت چرخشی؛ سرعت زاویه‌ای نازل؛ تئوری اصلاح‌شده‌ی واتسون | ||
| عنوان مقاله [English] | ||
| Experimental Study of the Effect of Fluid Jet Swirl on Circular Hydraulic Jump | ||
| نویسندگان [English] | ||
| Ali Asadi1؛ Seyyed Majid Malek Jafarian2؛ Ali Reza Teymourtash3 | ||
| 1Department of Mechanical Engineering, University of Birjand, Birjand, Iran | ||
| 2Shahid Avini | ||
| 3Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran | ||
| چکیده [English] | ||
| When an axially symmetrical fluid jet impacts on a horizontal plate vertically, a hydraulic jump is formed. Numerous studies are conducted on circular hydraulic jumps. However, the effect of the important and key parameter of fluid jet swirl on hydraulic jumps is not investigated. The main purpose of this study is to investigate the effect of this parameter on the circular hydraulic jump. The results of this study, achieved by using experimental method, show that the higher the angular velocity, the higher the increase in the radius of the jump. Drawing the diagram of the dimensionless radius of jump based on the dimensionless number of swirl shows two categories of lines. The first category is the constant angular velocity lines with a negative slope and the second category is the constant flow rate lines with a positive slope. The results showed that increasing the angular velocity of the swirling jet has less effect on increasing jump radius than increasing the flow rate. Experiments also showed that the hydraulic jumps created by a swirling jet follow the trend results of modified Watson’s theory with a non-significant difference. | ||
| کلیدواژه‌ها [English] | ||
| Circular hydraulic jump, Swirl jet, Angular velocity of nozzle, Modified Watson’s theory | ||
| مراجع | ||
|
[1] C. Avedisian, Z. Zhao, The circular hydraulic jump in low gravity, in Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences, The Royal Society, 456(2) (2000) 2127-2151. [2] L. Rayleigh, On the theory of long waves and bores, in Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 90(61) (1914) 324-328. [3] G. Birkhoff, E. Zarantonello, Jets, wakes, and cavities, Academic Press, New York, (1957). [4] E. Watson, The radial spread of a liquid jet over a horizontal plane, Journal of Fluid Mechanics, 20(3) (1964) 481-499. [5] A. Craik, R. Latham, M. Fawkes, P. Gribbon, The circular hydraulic jump, Journal of Fluid Mechanics, 112 (1981) 347-362. [6] M. Errico, A study of the interaction of liquid jets with solid surfaces, University of California, San Diego, (1986). [7] X. Liu, J.H. Lienhard, The hydraulic jump in circular jet impingement and in other thin liquid films, Experiments in Fluids, 15(2) (1993) 108-116. [8] J.W. Bush, J.M. Aristoff, The influence of surface tension on the circular hydraulic jump, Journal of Fluid Mechanics, 489 (2003) 229-238. [9] J.W. Bush, J.M. Aristoff, A. Hosoi, An experimental investigation of the stability of the circular hydraulic jump, Journal of Fluid Mechanics, 558 (2006) 33-52. [10] T. Bohr, P. Dimon, V. Putkaradze, Shallow-water approach to the circular hydraulic jump, Journal of Fluid Mechanics, 254 (1993) 635-648. [11] T. Bohr, V. Putkaradze, S. Watanabe, Averaging theory for the structure of hydraulic jumps and separation in laminar free-surface flows, Physical review letters, 79(6) (1997) 1038-1041. [12] F. Higuera, The hydraulic jump in a viscous laminar flow, Journal of fluid Mechanics, 274 (1994) 69-92. [13] K. Yokoi, F. Xiao, A numerical study of the transition in the circular hydraulic jump, Physics Letters A, 257(3) (1999) 153-157. [14] K. Yokoi, F. Xiao, Mechanism of structure formation in circular hydraulic jumps: Numerical studies of strongly deformed free-surface shallow flows, Physica D: Nonlinear Phenomena, 161(3) (2002) 202-219. [15] V. Ferreira, M. Tome, N. Mangiavacchi, A. Castelo, J. Cuminato, A. Fortuna, S. Mckee, High‐order upwinding and the hydraulic jump, International journal for numerical methods in fluids, 39(7) (2002) 549-583. [16] S. Watanabe, V. Putkaradze, T. Bohr, Integral methods for shallow free-surface flows with separation, Journal of fluid mechanics, 480 (2003) 233-265. [17] M. Gradeck, A. Kouachi, A. Dani, D. Arnoult, J. Borean, Experimental and numerical study of the hydraulic jump of an impinging jet on a moving surface, Experimental thermal and fluid science, 30(3) (2006) 193-201. [18] A.K. Ray, J.K. Bhattacharjee, Standing and travelling waves in the shallow-water circular hydraulic jump, Physics Letters A, 371(3) (2007) 241-248. [19] J. Mikielewicz, D. Mikielewicz, A simple dissipation model of circular hydraulic jump, International Journal of Heat and Mass Transfer, 52(1) (2009) 17-21. [20] R. Kate, P. Das, S. Chakraborty, An Investigation on non-circular hydraulic jumps formed due to obliquely impinging circular liquid jets, Experimental Thermal and Fluid Science, 32(8) (2008) 1429-1439. [21] M. Passandideh-Fard, A.R. Teymourtash, M. Khavari, Numerical study of circular hydraulic jump using volume-of-fluid method, Journal of Fluids Engineering, vol. 133(1) (2011) 011401. [22] C.W. Hirt, B.D. Nichols, Volume of fluid (VOF) method for the dynamics of free boundaries, Journal of computational physics, 39(1) (1981) 1981. [23] M. Johnson, D. Maynes, J. Crockett, Experimental characterization of hydraulic jump caused by jet impingement on micro-patterned surfaces exhibiting ribs and cavities, Experimental Thermal and Fluid Science, 58 (2014) 216-223. [24] K. Choo, S.J. Kim, The influence of nozzle diameter on the circular hydraulic jump of liquid jet impingement, Experimental Thermal and Fluid Science, 72 (2016) 12–17. [25] R. Fernandez-Feria, E. Sanmiguel-Rojas, E.S. Benilov, On the origin and structure of a stationary circular hydraulic jump, Physics of Fluids, 31 (2019) 072104. [26] A. Saberi, M.R. Mahpeykar, A.R. Teymourtash, Experimental Study and Numerical Simulation of the Circular Hydraulic Jump on the Concave Target Plate, Modares Mechanical Engineering, 20(2) (2020) 321-328.[27] Y. Wang, R.E. Khayat, The role of gravity in the prediction of the circular hydraulic jump radius for high-viscosity liquids, Journal of Fluid Mechanics, 682 (2019) 128-161. [28] N.A. Chigier, A. Chervinsky, Experimental investigation of swirling vortex motion in jets, Journal of Applied Mechanics, 34(2) (1967) 443-451. [29] P. Billant, J. Chomaz, P. Huerre, Experimental study of vortex breakdown in swirling jets, Journal of Fluid Mechanics, 376 (1998) 183-219. [30] L. Facciolo, A study on axially rotating pipe and swirling jet flows, Stockholm, Sweden (2006). [31] W. Rose, A Swirling Round Turbulent Jet: 1—Mean-Flow Measurements, Journal of Applied Mechanics, 29(4) (1962) 615-625. [32] B.D. Pratte, J. Keffer, The swirling turbulent jet, Journal of Fluids Engineering, 94(4) (1972) 739-747. [33] S. Komori, H. Ueda, Turbulent flow structure in the near field of a swirling round free jet, Physics of Fluids, 28(7) (1985) 2075-2082. [34] T. Loiseleux, J.M. Chomaz, Breaking of rotational symmetry in a swirling jet experiment, Physics of Fluids, 15(2) (2003) 511-523. [35] S. Farokhi, R. TAGhavi, E. Rice, Effect of initial swirl distribution on the evolution of a turbulent jet, AIAA journal, 27(6) (1989) 700-706. [36] J. Sislian, R. Cusworth, Measurements of mean velocity and turbulent intensities in a free isothermal swirling jet, AIAA journal, 24(2) (1986) 303-309. [37] J. Panda, D. Mclaughlin, Experiments on the instabilities of a swirling jet, Physics of Fluids, 6(1) (1994) 263-276. [38] D.G. Lilley, Annular vane swirler performance, Journal of propulsion and power, 15(2) (1999) 248-252. [39] H. Rahai, T. Wong, Velocity field characteristics of turbulent jets from round tubes with coil inserts, Applied Thermal Engineering, 22(9) (2002) 1037-1045. [40] G.L. Squires, Practical Physics, 4th Edition, Cambridge University Press, England (2001). | ||
|
آمار تعداد مشاهده مقاله: 1,158 تعداد دریافت فایل اصل مقاله: 1,438 |
||