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Influence of Mixing Efficiency in Y Shape Microchannels by Pulsing Flows
|關鍵字:||脈衝流;pulsing flow;混合效率;體積流率;無因次化;混合距離;mixing efficiency;flow rate;nondimensionalization;mixing length||出版社:||生醫工程研究所||引用:|| A. Manz, N. Graber, H. M. Widmer, Miniaturized Total Chemical Analysis Systems : a Novel Concept for Chemical Sensing, Sensors and Actuators. B1 (1990) 244-248.  S. H. Wong, M. C. L. Ward, C. W. Wharton, Micro T-mixer as a rapid mixing micromixer, Sensors and Actuators. B 100 (2004) 359-379.  C. K. Chen, C. C. Cho, A combined active/passive scheme for enhancing the mixing efficiency of microfluidic devices, Chemical Engineering Science. 63 (2008) 3081 – 3087.  D. Wang, J. L. Summers, Modelling of electrokinetically driven mixing ﬂow in microchannels with patterned blocks, Computers and Mathematics with Applications.55 (2008) 1601–1610.  M. S. Yoon, B. J.e Kim, H. J. Sung , Pumping and mixing in a microchannel using AC asymmetric electrode arrays, International Journal of Heat and Fluid Flow. 29 (2008) 269–280.  C. Y. Wen, C. P. Yeh, C. H. Tsai, L. M. Fu, Rapid magnetic microﬂuidic mixer utilizing AC electromagnetic field, Electrophoresis. 30 (2009) 4179–4186.  L.M. Fu, C.H. Tsai, K.P. Leong, C.Y. Wen, Rapid Micromixer Via Ferrofluids, Physics Procedia. 9 (2010) 270–273.  C. C. Cho, C. L. Chen, C. K. Chen, Mixing enhancement in crisscross micromixer using aperiodic electrokinetic, International Journal of Heat and Mass Transfer. 55 (2012 )2926–2933.  M. Nimafar, V. Viktorov, M.Martinelli, Experimental comparative mixing performance of passive micromixers with H-shaped sub-channels, Chemical Engineering Science.76 (2012) 37–44.  M. A. Ansari, K. Y. kim, Parametric study on mixing of two ﬂuids in a three-dimensional serpentine microchannel, Chemical Engineering Journal. 146 (2009) 439–448.  I. Glasgow, N. Aubry, Enhancement of microfluidic mixing using time pulsing, Lab Chip 3 (2003) 114–120.  I. Glasgow, S. Lieber, N. Aubry, Parameters Influencing Pulsed Flow Mixing in Microchannels, Anal. Chem. 76 (2004) 4825 – 4832.  D. L. Hitt, M. McGarry, Numerical simulations of laminar mixing surfaces in pulsatile microchannel ﬂows, Mathematics and Computers in Simulation. 65 (2004) 399–416.  A. Goullet, I. Glasgow, N. Aubrya, Eﬀects of microchannel geometry on pulsed ﬂow mixing, Mechanics Research communications. 33( 2006) 739–746.  S. Lee, H. Y. Lee, I. F Lee, C. Y. Tseng, Ink diffusion in water, Eur. J. Phys. 25 (2004) 331–336.  C. H. Lin, L. M. Fu, Y. S. Chien, Microfluidic T-Form Mixer Utilizing Switching Electroosmotic Flow, Anal. Chem.,76 (2004) 5265 – 5272.  A. Finlayson, A. Aditya, V. Brasher, L. Dahl, H. Q. Dinh, A. Field, J. Flynn, C. Jenssen, D. Kress, A. Moon, F. Ninh, A. Nordmeier, H. H. Song, C. Yuen, Mixing of liquids in Micrflouidic devices, COMSOL Conference oston. (2008)||摘要:||
A pulsing flow is a flow with a frequency-dependent flow velocity which can be used to enhance the mixing efficiency of micro-channels that originally is governed by the flow diffusive mechanism. In this paper, we investigated the utilization of the characteristics of pulsing flows with a varying flow velocity to enhance the flow mixing efficiency at low Reynolds number region. A Y-shaped micro-channel was used. Two pulsing flows having the same flow rate with a 180� phase angle were injected into the two inlets of the channel. A numerical investigation was performed to study the mixing efficiency of the channel with a square and a triangular pulsing flow. The results showed that a high pulsing flow frequency and a low flow rate reduced the mixing length of the channel. Moreover, under the same flow frequency and flow rate, the mixing efficiency of a square-wave flow was almost 1.7 times that of a triangular-wave flow. Finally, a nondimensional analysis was performed to examine the relationship between the mixing efficiency and the position of the flow in the channel. The relationship was nondimensionalized with respect to the flow frequency and the average flow velocity. It was found that a universal curve can be obtained for the mixing efficiency of the channel, regardless of the flow frequency and the flow rate.
|Appears in Collections:||生醫工程研究所|
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