پیوندهای مفید
آمار
| تعداد نشریات | 8 |
| تعداد شماره‌ها | 430 |
| تعداد مقالات | 5,596 |
| تعداد مشاهده مقاله | 7,062,868 |
| تعداد دریافت فایل اصل مقاله | 6,030,302 |
مطالعه اثر لغزش بر عملکرد ریزمخلوط گرهای الکترواسموتیکی بر مبنای معیار انتروپی | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 9، دوره 49، شماره 3، آبان 1396، صفحه 535-548 اصل مقاله (899.12 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2016.776 | ||
| نویسندگان | ||
| علی رضا فراهی نیا1؛ جعفر جماعتی* 2؛ حمید نیازمند1 | ||
| 1دانشکده مهندسی مکانیک، دانشگاه فردوسی مشهد، مشهد، ایران | ||
| 2دانشکده مهندسی مکانیک، دانشگاه رازی، کرمانشاه، ایران | ||
| چکیده | ||
| در این مقاله اختلاط الکتروکنتیکی درون ریزمجراهای ناهمگن مطالعه شده است و اثر ضریب لغزش، زتاپتانسیل، پارامتر دیبای هوکل و عدد رینولدز بر راندمان اختلاط بررسی شده است. ریزمجراهای مورد مطالعه دارای توزیع ناهمگن زتاپتانسیل روی دیواره هستند و سایر خواص سطحی آن یکنواخت است. برای بررسی اختلاط الکترواسموتیکی معادلات ناویر- استوکس، ارنست - پلانک، معادله پتانسیل الکتریکی و معادله غلظت به روش عددی حل شده اند. تایج نشان می دهد که رفتار ریزمخلوط گرهای الکترواسموتیکی به شدت وابسته به مقدار و توزیع زتاپتانسیل دیواره است و در اغلب موارد راندمان اختلاط با کاهش پارامترهای ضریب لغزش، دیبای- هوکل و عدد رینولدز، افزایش می یابد. مشاهده شد که ضریب لغزش نقش جدی بر راندمان اختلاط دارد به نحوی که در مقایسه با اختلاط کانال همگن می تواند در رینولدزهای کم باعث کاهش و در رینولدزهای بالا باعث افزایش راندمان اختلاط گردد. همچنین، دقت مدل تقریبی هلمهولتز - اسمولموکوفسکی نیز مورد بررسی قرار گرفت و معلوم شد که در مواردی که زتاپتانسیل دیواره زیاد باشد و یا مقدار پارامتر دیبای هوکل کم باشد، نتایج حاصل از این مدل دارای خطای قابل ملاحظه ای نسبت به مدل ارنست - پلانک خواهد بود. علاوه بر این نتیجه گردید که هرچه میزان عدم تقارن بار بیشتر باشد، عملکرد اختلاطی ریزمخلوط گر افزایش می یابد و لذا جهت رسیدن به میزان اختلاط مشخص، طول کمتری نیاز خواهد بود. | ||
| کلیدواژه‌ها | ||
| اختلاط؛ زتاپتانسیل ناهمگن؛ انتروپی اختلاط؛ جریان الکترواسموتیک؛ مدل هلمهولتز- اسمولوکوفسکی | ||
| عنوان مقاله [English] | ||
| Study of Slip Effect on Electro-osmotic Micromixer Performance Based on Entropy Index | ||
| نویسندگان [English] | ||
| A. R. Farahinia1؛ J. Jamaati2؛ H. Niazmand1 | ||
| 1Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran | ||
| 2Department of Mechanical Engineering, Razi University, Kermanshah, Iran | ||
| چکیده [English] | ||
| In this article electrokinetic mixing through heterogeneous microchannels has been studied and the effects of slip coefficient, zeta-potential, Debye-Huckel parameter and Reynolds number on mixing efficiency have been investigated. The microchannels have homogenous surface properties except for zeta-potential. In order to study the electro-osmotic mixing, the Navier-Stokes, Nernst–Planck, electric potential and concentration equations have been solved numerically. In order to evaluate the mixing efficiency, entropy of concentration has been used as a quantitative index. The results show that the behavior of electro-osmotic micromixers is highly depended to amount and distribution of wall zeta-potential. Furthermore, mixing efficiency increases with reduction of slip coefficient and Debye-Huckel and Reynolds number parameters in most cases. It is seen that slip coefficient can decrease or increase mixing efficiency dependent on the Reynolds number. Furthermore the accuracy of Helmholtz-Smoluchowski approximate model is also investigated and it is found that in high wall zeta-potential cases or low values of Debye- Huckel parameter, results of this model have significant error compared to Nernst-Planck model. It is also found that the mixing performance increases when as the charge pattern of micromixer is more asymmetric so that the certain mixing value can be obtained in shorter length which is importance in micromixers design. | ||
| کلیدواژه‌ها [English] | ||
| Mixing, Heterogeneous zeta-potential, Mixing entropy, Electro-osmotic flow, Helmholtz-Smoluchowski model | ||
|
سایر فایل های مرتبط با مقاله
|
||
| مراجع | ||
|
[1] L.M. Fu, R.J. Yang, G.B. Lee, H.H. Liu, Electrokinetic injection techniques in microfluidic chips, Analytical chemistry, 74(19) (2002) 5084-5091. [2] V.E. Papadopoulos, I.N. Kefala, G. Kaprou, G. Kokkoris, D. Moschou, G. Papadakis, E. Gizeli, A. Tserepi, A passive micromixer for enzymatic digestion of DNA, Microelectronic Engineering, 124 (2014) 42-46. [3] A. Ahmadian Yazdi, A. Sadeghi, M.H. Saidi, Electrokinetic mixing at high zeta potentials: Ionic size effects on cross stream diffusion, Journal of Colloid and Interface Science, 442 (2015) 8-14. [4] A. Alizadeh, L. Zhang, M. Wang, Mixing enhancement of low-Reynolds electro-osmotic flows in microchannels with temperature-patterned walls, Journal of Colloid and Interface Science, 431 (2014) 50-63. [5] S. Ebrahimi, A. Hasanzadeh-Barforoushi, A. Nejat, F.Kowsary, Numerical study of mixing and heat transfer in mixed electroosmotic/pressure driven flow through T-shaped microchannels, International Journal of Heat and Mass Transfer, 75 (2014) 565-580. [6] R. Peng, D. Li, Effects of ionic concentration gradient on electroosmotic flow mixing in a microchannel, Journal of Colloid and Interface Science, 440 (2015) 126-132. [7] S. Bera, S. Bhattacharyya, On mixed electroosmoticpressure driven flow and mass transport in microchannels,International Journal of Engineering Science, 62 (2013)165-176. [8] A.K. Nayak, Analysis of mixing for electroosmotic flow in micro/nano channels with heterogeneous surface potential, International Journal of Heat and Mass Transfer, 75 (2014) 135-144. [9] Y.Y. Liang, G.A. Fimbres Weihs, D.E. Wiley,Approximation for modelling electro-osmotic mixing in the boundary layer of membrane systems, Journal of Membrane Science, 450 (2014) 18-27. [10] C.O. Ng, C. Qi, Electroosmotic flow of a power-law fluid in a non-uniform microchannel, Journal of Non-Newtonian Fluid Mechanics, 208–209 (2014) 118-125. [11] J. Jamaati, H. Niazmand, M. Renlsizbulut, Investigation of electrokinetic mixing in 3D non-homogenous microchannels, Journal Of Computational And Applied Research In Mechanical Engineering, 3(1) (2013) 41-52. [12] J. Jamaati, A.R. Farahinia, H. Niazmand, Mixing Investigation In Combined Electroosmotic/Pressuredriven Micromixers With Heterogeneous Wall Charges,Modares Mechanical Engineering, 15(7) (2015) 297-306. [13] S. Bhattacharyya, S. Bera, Nonlinear Electroosmosis Pressure-Driven Flow in a Wide Microchannel With Patchwise Surface Heterogeneity, Journal of Fluids Engineering, 135(2) (2013) 021303. [14] S. Bhattacharyya, S. Bera, Combined electroosmosispressure driven flow and mixing in a microchannel with surface heterogeneity, Applied Mathematical Modelling,39 (15) (2015) 4337-4350. [15] J. Jamaati, A.R. Farahinia, H. Niazmand, Numerical Investigate of Electroosmotic Flow in Heterogeneous Microchannels, Modares Mechanical Engineering, 15(3)(2015) 260-270. [16] J. Jamaati, A.R. Farahinia, H. Niazmand, Investigation of Mixing in Electroosmotic Micromixers using Nernst-Planck Equations, Modares Mechanical Engineering,15(4) (2015) 203-213. [17] J.T. Cheng, N. Giordano, Fluid flow through nanometerscale channels, Physical Review E - Statistical, Nonlinear,and Soft Matter Physics, 65 (3) (2002) 0312061-0312065. [18] J.K. Holt, H.G. Park, Y. Wang, M. Stadermann, A.B.Artyukhin, C.P. Grigoropoulos, A. Noy, O. Bakajin,Fast mass transport through sub-2-nanometer carbon nanotubes, Science, 312 (5776) (2006) 1034-1037. [19] M. Majumder, N. Chopra, R. Andrews, B.J. Hinds,Nanoscale hydrodynamics: Enhanced flow in carbon nanotubes, Nature, 438 (7064) (2005) 44. [20] D.C. Tretheway, C.D. Meinhart, A generating mechanism for apparent fluid slip in hydrophobic microchannels, Physics of Fluids, 16 (5) (2004) 1509-1515. [21] Y. Zhu, S. Granick, Rate-dependent slip of Newtonian liquid at smooth surfaces, Physical Review Letters, 87 (9)(2001) 961051-961054. [22] C. Neto, D.R. Evans, E. Bonaccurso, H.J. Butt, V.S.J.Craig, Boundary slip in Newtonian liquids: A review of experimental studies, Reports on Progress in Physics, 68(12) (2005) 2859-2897. [23] J.W.G. Tyrrell, P. Attard, Images of nanobubbles on hydrophobic surfaces and their interactions, Physical Review Letters, 87 (17) (2001) 1761041-1761044. [24] L. Joly, C. Ybert, E. Trizac, L. Bocquet, Liquid friction on charged surfaces: From hydrodynamic slippage to electrokinetics, Journal of Chemical Physics, 125 (20)(2006) 204716 [25] Y. Ren, D. Stein, Slip-enhanced electrokinetic energy conversion in nanofluidic channels, Nanotechnology, 19(19) (2008) 195707. [26] C.I. Bouzigues, P. Tabeling, L. Bocquet, Nanofluidics in the debye layer at hydrophilic and hydrophobic surfaces,Physical Review Letters, 101 (11) (2008) 114503. [27] S. Chakraborty, Generalization of interfacial electrohydrodynamics in the presence of hydrophobic interactions in narrow fluidic confinements, Physical Review Letters, 100 (9) (2008) 097801. [28] J. Yang, D.Y. Kwok, Effect of liquid slip in electrokinetic parallel-plate microchannel flow, Journal of Colloid and Interface Science, 260 (1) (2003) 225-233. [29] H.M. Park, Y.J. Choi, A method for simultaneous estimation of inhomogeneous zeta potential and slip coefficient in icrochannels, Analytical Chimica. Acta.,616 (2) (2008) 160-169. [30] H.M. Park, T.W. Kim, Simultaneous estimation of zeta potential and slip coefficient in hydrophobic microchannels, Analytical Chimica. Acta., 593 (2) (2007)171-177. [31] A. Alam, A. Afzal, K.Y. Kim, Mixing performance of a planar micromixer with circular obstructions in a curved microchannel, Chemical Engineering Research and Design, 92 (3) (2014) 423-434. [32] N. Solehati, J. Bae, A.P. Sasmito, Numerical investigation of mixing performance in microchannel T-junction with wavy structure, Computers & Fluids, 96(2014) 10-19. [33] M.M. Afsari, Joule heating effects in electroosmotic flow through microchannel, Birjand University, Birjand,2012. [34] P. Fodor, B. Vyhnalek, M. Kaufman, Entropic Evaluation of Dean Flow Micromixer, in: Proceeding of COMSOLConference, Boston, 2013. [35] F.M. Mastrangelo, F. Pennella, F. Consolo, M. Rasponi, A. Redaelli, F.M. Montevecchi, U. Morbiducci,Micromixing and Microchannel Design: Vortex Shape and Entropy, in: 2nd Micro and Nano Flows Conference,West London, 2009. [36] G. Zongyu, J.J. Chen, An analysis of the entropy of mixing for granular materials, Powder Technology, 266(2014) 90-95. [37] M. Wang, J. Wang, S. Chen, N. Pan, Electrokinetic pumping effects of charged porous media in microchannels using the lattice Poisson-Boltzmann method, J. Colloid Interface Sci., 304(1) (2006) 246-253. [38] J.H. Masliyah, Electrokinetik transport phenomena,Alberta Oil Sands Technology and Research Authority,Canada, 1994. [39] E.B. Cummings, S.K. Griffiths, R.H. Nilson, P.H. Paul,Conditions for similitude between the fluid velocity and electric field in electroosmotic flow, Analytical chemistry, 72(11) (2000) 2526-2532. [40] J.G. Santiago, Electroosmotic Flows in Microchannels with Finite Inertial and Pressure Forces, Analytical chemistry, 73(10) (2001) 2353-2365. [41] C.E. Shannon, A mathematical theory of communication,Bell Syst. Technol. J., 27 (1948) 379-423, 623-656. [42] W. Weaver, C.E. Shannon, The Mathematical Theory of Communication, University of Illinois Press, United State of America, 1963. [43] R.J. Hunter, Zeta Potential in Colloid Science, Academic Press, United State of America, 1981. [44] S.A. Mirbozorgi, H. Niazmand, M. Renksizbulut,Electro-Osmotic Flow in Reservoir-Connected Flat Microchannels With Non-Uniform Zeta Potential, Journal of Fluids Engineering, 128(6) (2006) 1133-1143. | ||
|
آمار تعداد مشاهده مقاله: 1,367 تعداد دریافت فایل اصل مقاله: 1,262 |
||
