Difference between revisions of "A Design for Mixing Using Bubbles in Branched Microfluidic Channels"

From Soft-Matter
Jump to: navigation, search
Line 10: Line 10:
  
 
== Summary ==
 
== Summary ==
 
+
This paper details experimental work and simple supporting theory regarding mixing in microfluidic channels.  For most microfluidic systems, the Reynolds number remains small (less than 1000), so turbulence is absent and mixing only occurs via diffusion.  Typical Peclet numbers in microfluidic channels are on the order of 1e5, indicating that mixing to homogeneity requires length scales on the order of 10 meters.  These lengths are not easily achieved on microfluidic devices due to finite substrate limits for fabrication and large pressure drops in the long channels, so the authors propose a novel method of mixing that aid the diffusion process.  Using bubbles to fold two liquid streams into one another, greater contact area between the fluids is created, aiding in diffusion.
  
 
== Practical Application of Research ==
 
== Practical Application of Research ==

Revision as of 05:23, 3 March 2009

"Design for mixing using bubbles in branched microfluidic channels" Piotr Garstecki, Michael A. Fischbach, and George M. Whitesides Applied Physics Letters 86(24) 244108 (2005)

Soft Matter Keywords

microfluidic, mixing, bubbles, laminar

Figure 1. (a) XR data for the dry (black circles) and wet (red and blue circles) obtained on the nanopatterned surface. (b) Corresponding electron density profiles for the dry (black) and wet surfaces in the filling (red) and growing regimes (blue).


Summary

This paper details experimental work and simple supporting theory regarding mixing in microfluidic channels. For most microfluidic systems, the Reynolds number remains small (less than 1000), so turbulence is absent and mixing only occurs via diffusion. Typical Peclet numbers in microfluidic channels are on the order of 1e5, indicating that mixing to homogeneity requires length scales on the order of 10 meters. These lengths are not easily achieved on microfluidic devices due to finite substrate limits for fabrication and large pressure drops in the long channels, so the authors propose a novel method of mixing that aid the diffusion process. Using bubbles to fold two liquid streams into one another, greater contact area between the fluids is created, aiding in diffusion.

Practical Application of Research

Microfluidic Mixing Using Bubbles


[1] any citations?