화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.26, No.3, 335-340, August, 2014
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Effect of elasticity number and aspect ratio on the vortex dynamics in 4:1 micro-contraction channel flow
Daewoong Lee, Youngseok Kim, and Kyung Hyun Ahn†
  • School of Chemical and Biological Engineering, Institute of Chemical Process, Seoul National University, Gwanak-gu, Seoul 151-744, Republic of Korea
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Changes in flow pattern were investigated for a viscoelastic fluid (polyethylene oxide) in various-sized micro-fabricated planar 4:1 contraction channels. The flow pattern changed from a Newtonian-like flow to a flow with a vortex growth region, during which a divergent flow and lip vortex were also observed depending on the elasticity number (El) and aspect ratio. When the aspect ratio was large, the lip vortex was observed only in a limited number of cases, and the flow pattern occurring before the vortex growth was more diverse. When the elasticity number was large, the divergent flow was not observed unlike the cases in which the Elasticity number was small. The flow pattern in the contraction microchannel was found to be diverse and abundant depending on the aspect ratio and elasticity number.
Keywords:microchannel;contraction geometry;viscoelastic fluid;flow pattern;aspect ratio
  1. Afonso AM, Oliveira PJ, Pinho FT, Alves MA, J. Fluid Mech., 677, 272 (2011)
  2. Alves MA, Poole RJ, J. Non-Newton. Fluid Mech., 144(2-3), 140 (2007)
  3. McDonald JC, Duffy DC, Anderson JR, Chiu DT, Wu HK, Schueller OJA, Whitesides GM, Electrophoresis, 21(1), 27 (2000)
  4. Boger DV, Annu. Rev. Fluid Mech., 19, 157 (1987)
  5. Boger DV, Hur DU, Binnington RJ, J Non-Newt. Fluid, 20, 31 (1986)
  6. Bonn D, Meunier J, Phys. Rev. Lett., 79, 2662 (1997)
  7. Cable PJ, Boger DV, AIChE J., 24, 869 (1978)
  8. Cable PJ, Boger DV, AIChE J., 24, 992 (1978)
  9. Cable PJ, Boger DV, AIChE J., 25, 152 (1979)
  10. Groisman A, Quake SR, A microfluidic rectifier: anisotropic flow resistance at low Reynolds numbers, Phys. Rev. Lett. 92, 094501 (2004)
  11. Gulati S, Muller SJ, Liepmann D, J. Non-Newton. Fluid Mech., 155(1-2), 51 (2008)
  12. Kwon Y, J. Rheol., 56(6), 1335 (2012)
  13. Kwon Y, Park KS, Korea-Aust. Rheol. J., 24(1), 53 (2012)
  14. McKinley GH, Raiford WP, Brown RA, Armstrong RC, J. Fluid Mech., 223, 411 (1991)
  15. Mitchell P, Nat. Biotechnol., 19, 717 (2001)
  16. Nguyen H, Boger DV, J. Non-Newt. Fluid, 5, 353 (1979)
  17. Nigen S, Walters K, J. Non-Newton. Fluid Mech., 102(2), 343 (2002)
  18. Pakdel P, McKinley GH, Phys. Rev. Lett., 77, 2459 (1996)
  19. Rodd LE, Cooper-White JJ, Boger DV, McKinley GH, J. Non-Newton. Fluid Mech., 143(2-3), 170 (2007)
  20. Rodd LE, Scott TP, Boger DV, Cooper-White JJ, McKinley GH, J. Non-Newton. Fluid Mech., 129(1), 1 (2005)
  21. Rodd LE, Scott TP, Cooper-White JJ, McKinley GH, Appl. Rheol., 15, 12 (2004)
  22. Rodd LE, Lee D, Ahn KH, Cooper-White JJ, J. Non-Newton. Fluid Mech., 165(19-20), 1189 (2010)
  23. Ng JMK, Gitlin I, Stroock AD, Whitesides GM, Electrophoresis, 23(20), 3461 (2002)
  24. Walters K, Webster MF, Philos. Trans. R. Soc. Lond. A, 308, 199 (1982)