== Applications to Microfluidics ==
[[Image:Tsensor.jpeg|150px|right|thumbnail|'''Figure 2''' Diffusion dominated mixing that occurs in a T-sensor makes it useful in florescence based analytical tests ]]
The low inertial forces present within many microfluidic setups often yield low Reynolds number flows <sup>[
5]</sup> : low levels of turbulence can also be expected in these flow regimes. Thus convection is not prevalent in microfluidic setups, unless they are purposely induced Low length and velocity scales in microfluidic setups- > Low Reynolds number. This also implies lower convective forces when compared to larger devices. As such, Pe in a microfluidic device is usually lower than 1 and as such, implying that these regimes are diffusion dominant[ Squires and Quake]
This has an effect in making turbulence non existent in microfluidic devices. Turbulence in macro-world often leads to faster mixing -> Diffusion induced mixing is slower than covective mixing - >Slow as in different time scales (order of minutes) [Squires and Quake].
Thus, low Pe systems (Pe<1), have trouble getting good mixing -> If no mixing is desired, this can be optimal. However, in reaction systems, where mixing is necessary for reactions, Low Pe can be a hindrance [Squres and Quake]. While length of channels can be increased to increase Pe, this may not be optimal in all cases.