پیوندهای مفید
آمار
| تعداد نشریات | 7 |
| تعداد شماره‌ها | 409 |
| تعداد مقالات | 5,454 |
| تعداد مشاهده مقاله | 5,822,163 |
| تعداد دریافت فایل اصل مقاله | 5,200,387 |
بررسی اختلاط دو سیال متفاوت در یک میکروکانال با پره منحنی شکل به روش بولتزمن | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 15، دوره 52، شماره 11، بهمن 1399، صفحه 3187-3202 اصل مقاله (2.53 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2019.16375.6349 | ||
| نویسندگان | ||
| رضا کاوه1؛ محمد سفید* 2؛ محسن مظفری شمسی3 | ||
| 1دانشجوی دکتری، دانشکده مکانیک، دانشگاه یزد، یزد، ایران | ||
| 2دانشگاه یزد | ||
| 3استادیار، دانشکده مهندسی، دانشگاه میبد، میبد، ایران | ||
| چکیده | ||
| در مطالعه حاضر اختلاط دو سیال با لزجت‌های متفاوت در یک میکرو کانال مجهز به پره نوسانی منحنی شکل به روش شبکه بولتزمن با زمان آسایش چندگانه شبیه سازی شده و اثرات شکل هندسی، سرعت و دامنه نوسان پره و نسبت لگاریتمی لزجت بر بازده اختلاط بررسی شده است. در مطالعات صورت گرفته در زمینه اختلاط، پره در میکرو کانال به شکل استوانه و یا مستطیل و در اکثر مطالعات دو سیال یکسان در نظر گرفته شده است. در این تحقیق برای اولین بار از پره منحنی شکل جهت اختلاط دو سیال با لزجت متفاوت استفاده شده است. شبیه سازی در عدد رینولدز 80 ، عدد اشمیت 10 انجام شده و برای پره منحنی از شکل ایرفویل ( NASA/LANGLEY LS(1) −0417 (GA(W) −1 استفاده شده است. نتایج نشان داد که بازده اختلاط دو سیال با لزجت یکسان و متفاوت، در میکرو کانال مجهز به پره منحنی شکل بالاتر از میکرو کانال مجهز به پره مستطیل شکل است. همچنین نتایج نشان داد که در دامنه‌های نوسان بررسی شده با افزایش عدد استروهال، بازده نیز افزای ش می‌یابد، بازده اختلاط در دامنه نوسان 5/ 0 در تمام اعداد استروهال بررسی شده یک مقدار بهینه را دارد و با افزایش نسبت لگاریتمی لزجت در اعداد استروهال بررسی شده، بازده کاهش می‌یابد. | ||
| کلیدواژه‌ها | ||
| اختلاط؛ میکرو کانال؛ لزجت متفاوت؛ روش شبکه بولتزمن با زمان آسایش چندگانه؛ پره منحنی شکل نوسانی | ||
| عنوان مقاله [English] | ||
| Numerical Simulation of Mixing Two Fluids of Different Viscosities in a Microchannel with Curved Stirrer by Lattice Boltzmann Method | ||
| نویسندگان [English] | ||
| Reza Kaveh1؛ Mohammad Sefid2؛ Mohsen Mozafari shamsi3 | ||
| 1Ph.D. Student, Departmet of Mechanical Engineering, University of Yazd, Yazd, Iran | ||
| 2mechanical engineering yazd university yazd | ||
| 3Assistant Professor, Departmet of Engineering, University of Meybod, Meybod, Iran | ||
| چکیده [English] | ||
| In the present study, mixing of two fluids of different viscosities in a micro channel with an oscillating curved stirrer was simulated by multi relaxation time Lattice Boltzmann method and the effect of geometric shape, oscillating speed and amplitude and viscosity logarithmic ratio on mixing efficiency was analyzed. In researches in this field, the stirrer is considered as cylinder or rectangle shape and in most these researches, two fluids are same. In this study, a curved stirrer was used for mixing two fluids of different viscosities in microchannel for the first time. Calculations are performed for the dimensionless parameters of the problem including the oscillation amplitude K, viscosity logarithmic ratio R and Strouhal number St for Re=80 and Sc=10. NASA/LANGLEY LS(1)-0417 (GA(W)-1) airfoil shape was used for curved stirrer. Results showed that mixing efficiency of two fluids of same and different viscosities in microchannel with oscillating curved stirrer was higher than microchannel with oscillating rectangle stirrer. In addition, results revealed that increase in Strouhal number causes increase in mixing efficiency on studied oscillating amplitude. Optimum efficiency is on oscillating amplitude 0.5 on all studied Strouhal numbers. Also mixing efficiency decreases with increase of viscosity logarithmic ratio on studied Strouhal numbers. | ||
| کلیدواژه‌ها [English] | ||
| Mixing, Micro channel, Different viscosities, Oscillating curved stirrer | ||
| مراجع | ||
|
[1] N. T. Nguyen, Micromixers: fundamentals, design and fabrication, William Andrew, (1970). [2] V. Hessel, H. Löwe, F. Schönfeld, Micromixers—a review on passive and active mixing principles, Chemical Engineering Science, 60(8-9) (2005) 2479- 2501. [3] L. Capretto, W. Cheng, M. Hill, X. Zhang, Micromixing within microfluidic devices, in: Microfluidics, Springer, (2011), pp. 27-68. [4] J. Y. Park, Y. D. Kim, S. R. Kim, S. Y. Han, J. S. Maeng, Robust design of an active micro-mixer based on the Taguchi method, Sensors and Actuators B: Chemical, 129(2) (2008) 790-798. [5] M. Koch, H. Witt, A. Evans, A. Brunnschweiler, Improved characterization technique for micromixers, Journal of Micromechanics and Microengineering, 9(2) (1999) 156. [6] Y.Z. Liu, B.J. Kim, H.J. Sung, Two-fluid mixing in a microchannel, International journal of heat and fluid flow, 25(6) (2004) 986-995. [7] R.H. Liu, M.A. Stremler, K.V. Sharp, M.G. Olsen, J.G. Santiago, R.J. Adrian, H. Aref, D.J. Beebe, Passive mixing in a three-dimensional serpentine microchannel, Journal of microelectromechanical systems, 9(2) (2000) 190-197. [8] S. J. An, Y. D. Kim, S. Heu, J. S. Maeng, Numerical study of the mixing characteristics for rotating and oscillating stirrers in a microchannel, Journal of the Korean Physical Society, 49(2) (2006) 651-659. [9] S. Y. Jin, Y. Z. Liu, W. Z. Wang, Z. M. Cao, H.S. Koyama, Numerical evaluation of two-fluid mixing in a swirl micro-mixer, Journal of Hydrodynamics, 18(5) (2006) 542-546. [10] Y.D. Kim, S.J. An, J.S. Maeng, Numerical analysis of the fluid mixing behaviors in a microchannel with a circular cylinder and an oscillating stirrer, Journal of Korean Physical Society, 50 (2007) 505. [11] B. Celik, U. Akdag, S. Gunes, A. Beskok, Flow past an oscillating circular cylinder in a channel with an upstream splitter plate, Physics of Fluids, 20(10) (2008) 103603. [12] B. Celik, A. Beskok, Mixing induced by a transversely oscillating circular cylinder in a straight channel, Physics of Fluids, 21(7) (2009) 073601. [13] M. Im, J. Y. Park, Y. K. Oh, Y. D. Kim, J. S. Maeng, S. Y. Han, Microfluidic analysis of a micro-mixer with an oscillating stirrer. [14] S. P. Ryu, J. Y. Park, S. Y. Han, Optimum design of an active micro-mixer using successive Kriging method, International Journal of Precision Engineering and Manufacturing, 12(5) (2011) 849-855. [15] R. Shamsoddini, M. Sefid, R. Fatehi, ISPH modelling and analysis of fluid mixing in a microchannel with an oscillating or a rotating stirrer, Engineering Applications of Computational Fluid Mechanics, 8(2) (2014) 289-298. [16] R. Shamsoddini, Numerical Investigation of Fluid Mixing in a Micro-Channel Mixer with Two Rotating Stirrers by Using the Incompressible SPH Method, Iran. J. Chem. Chem. Eng. Research Article Vol, 36(5) (2017). [17] S. Ghanbari, M. Sefid, R. Shamsoddini, Numerical Analysis of two-fluid mixing with various Density and Viscosity in a microchannel with forced oscillating stirrer. Modares Mechanical Engineering, 16(8) (2016) 109-119. (in Persian) [18] H. Khozeymeh-Nezhad, H. Niazmand, A numerical analysis of an active micromixer with the oscillating stirrer at the different aspect ratios by LBM. Modares Mechanical Engineering, 17(9) (2017) 417-426. (in Persian) [19] H. Khozeymeh-Nezhad, H. Niazmand, A double MRT-LBM for simulation of mixing in an active micromixer with rotationally oscillating stirrer in high Peclet number flows. International Journal of Heat and Mass Transfer, 122 (2018) 913-921. [20] J. Ortega-Casanova, Enhancing mixing at a very low Reynolds number by a heaving square cylinder, J Fluid Struct, 65(2016)1-20. [21] J. Ortega-Casanova, CFD study on mixing enhancement in a channel at a low Reynolds number by pitching a square cylinder. Comput Fluids, 145(2017) 141-152. [22] R. Shamsoddini, SPH investigation of the thermal effects on the fluid mixing in a microchannel with rotating stirrers, Fluid Dynamics Research 50(2018) 025509. [23] L. Talon, E. Meiburg, Plane Poiseuille flow of miscible layers with different viscosities: instabilities in the Stokes flow regime. Journal of Fluid Mechanics, 686 (2011) 484-506. [24] P. Lallemand, L. S. Luo, Theory of the lattice Boltzmann method: Acoustic and thermal properties in two and three dimensions, Physical review E, 68(3) (2003) 036706. [25] Z. Guo, C. Shu, Lattice Boltzmann method and its applications in engineering, World Scientific, (2013). [26] L. Li, R. Mei, J.F. Klausner, Lattice Boltzmann models for the convection-diffusion equation: D2Q5 vs D2Q9, International Journal of Heat and Mass Transfer, 108 (2017) 41-62. [27] Q. Zou, X. He, On pressure and velocity boundary conditions for the lattice Boltzmann BGK model, Physics of fluids, 9(6) (1997) 1591-1598. [28] Z. Guo, C. Zheng, B. Shi, An extrapolation method for boundary conditions in lattice Boltzmann method, Physics of fluids, 14(6) (2002) 2007-2010. [29] L. Li, R. Mei, J.F. Klausner, Boundary conditions for thermal lattice Boltzmann equation method, Journal of Computational Physics, 237 (2013) 366-395. [30] P. Lallemand, L. S. Luo, Lattice Boltzmann method for moving boundaries, Journal of Computational Physics, 184(2) (2003) 406-421. | ||
|
آمار تعداد مشاهده مقاله: 615 تعداد دریافت فایل اصل مقاله: 833 |
||