Experimental test of scaling of mixing by chaotic advection in droplets moving through microfluidic channels

被引:325
作者
Song, H [1 ]
Bringer, MR [1 ]
Tice, JD [1 ]
Gerdts, CJ [1 ]
Ismagilov, RF [1 ]
机构
[1] Univ Chicago, Dept Chem, Chicago, IL 60637 USA
关键词
D O I
10.1063/1.1630378
中图分类号
O59 [应用物理学];
学科分类号
摘要
This letter describes an experimental test of a simple argument that predicts the scaling of chaotic mixing in a droplet moving through a winding microfluidic channel. Previously, scaling arguments for chaotic mixing have been described for a flow that reduces striation length by stretching, folding, and reorienting the fluid in a manner similar to that of the baker's transformation. The experimentally observed flow patterns within droplets (or plugs) resembled the baker's transformation. Therefore, the ideas described in the literature could be applied to mixing in droplets to obtain the scaling argument for the dependence of the mixing time, tsimilar to(aw/U)log(Pe), where w [m] is the cross-sectional dimension of the microchannel, a is the dimensionless length of the plug measured relative to w, U [m s(-1)] is the flow velocity, Pe is the Peclet number (Pe=wU/D), and D [m(2) s(-1)] is the diffusion coefficient of the reagent being mixed. Experiments were performed to confirm the scaling argument by varying the parameters w, U, and D. Under favorable conditions, submillisecond mixing has been demonstrated in this system. (C) 2003 American Institute of Physics.
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页码:4664 / 4666
页数:3
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