Microsystems with Two Length Scales

The characteristic velocity in the x-direction is given by the mean velocity 

Finally, the characteristic pressure is given by the pressure drop Pq, see Table 2.3, 

for convenience, we have dropped the numerical factor of 12 / hyd = ) We can 

the reference pressure can be written using this equation as 

If we follow the convention that the Reynolds number Re should contain the smallest length scale of the problem, here h, we define 

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