Laminar multiple inlets

For miscible additives of higher viscosity with a Pc/Pd ratio of 1 10 000, Streiff (1999) claims that no mixing is possible using static mixers operating in laminar flow. Diffusion will stiU occur and this suggests that multiple inlets will be helpful. 

We first explain the setting of reactors for all CFD simulations. We used Fluent 6.2 as a CFD code. Each reactant fluid is split into laminated fluid segments at the reactor inlet. The flow in reactors was assumed to be laminar flow. Thus, the reactants mix only by molecular diffusion, and reactions take place fi om the interface between each reactant fluid. The reaction formulas and the rate equations of multiple reactions proceeding in reactors were as follows A + B R, ri = A iCaCb B + R S, t2 = CbCr, where R was the desired product and S was the by-product. The other assumptions were as follows the diffusion coefficient of every component was 10" m /s the reactants reacted isothermally, that is, k was fixed at... 

Figure 2. Concq)t of differential manipulation in a single bovine capillary endothelial cell using multiple laminar flows, (a, b). Chip layout 300 x 50 pm channels are used to create laminar interfaces between hquids from different inlets, (c) Fluorescence image of a cell locally exposed to red and green fluorophores in a laminar flow, (d) Migration of fluorophores over time (scale bars, 25 pm). This shows the high potential for accurate spatial control and separation of hquids achievable in microfluidic laminar flows. (Adapted by permission from Macmillan Pubhshers, Ltd Nature [29], copyright 2001.)...

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