Bimodal Intersecting Channel Mixing

At a certain point they merge and mixing takes place by diffusion at constantly recreated and renewed interfaces, (b) A similar flow arrangement with square bed objects however, this time a micromachined packed bed is shown, (c) Artificial new structure of a packed bed where some objects of the packed bed have been removed. Now, flow conduits exist which are intended to promote lateral mixing, (d) Bimodal intersecting channel micro mixer, which is a micromachined design resembling the idea depicted in (C) [160] (by courtesy of ACS). 

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Figure 1.176 A suggestion as to how the flow might develop in the bimodal intersecting channel micro mixer. Distinct zones with small and large channels serve to promote mixing by diffusive and convective transport, respectively [160] (by courtesy of ACS).

M 85] [P 75] In order to determine reaction kinetics by a stopped-flow method, the mixing step within a microfluidic system was improved [161]. Traditionally, an efficient external T-channel mixer is used for this purpose. Now, the bimodal intersecting channel micro mixer was integrated into the system. The mixer has the following advantages over the current state of the art ... 

Figure 1.178 Stopped-flow enzymatic assays when using an external T-channel micro mixer, the bimodal intersecting channel micro mixer and the flow before the micro mixer with only diffusion mixing [161 ]...

It could be shown that the bimodal intersecting channel micro mixer clearly improves the mixing performance. The corresponding axial concentration profile is virtually flat, i.e. mixing has led to the same concentration within the channel [161]. Without the use of the micro mixer more or less the initial concentration profile is found, i.e. a two-sectioned profile with two constant concentration values due to the bi-laminated structure. 

The mixing results of the bimodal intersecting mixer show that microstructured analogs of packed-bed structures can mix efficiently. Small micro channels resemble... 

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