V06_Passive Diffusive Micromixers for Bio-MEMS

In microfluidics, the diffusion time needed for a particle to diffuse the length lD is calculated by tD = 2*sqrt(D * lD).

The diffusion length lD in microfluidics is favorable for microfluidics.

Diffusive mixing in microfluidics is determined by the particle size.

To achieve diffusive mixing in microfluidics, active structures are required.

In laminar flow mixing, the diffusion length is defined by the channel width divided by 2.

The information for achieving complete diffusive mixing in microfluidics can be found in slides 7 and 19 of the lecture.

Reduced diffusion length can be achieved by increasing the diffusivity D in microfluidics applications.

When diffusivity D is too small, the channel length for complete diffusive mixing will be shorter in a chip format.

Layering technique can be used to reduce the minimum channel length in microfluidics applications.

Active mixing by interdigitated lamella is more effective than passive mixing in microfluidic systems.

In laminar flow mixing, the channel length can be shortened by increasing the velocity of the fluid.

Y-mixer is an example of a passive diffusive micromixer.

For complete diffusive mixing in microfluidics, the channel length must be at least twice the diffusion distance.

Passive diffusive micromixers rely on external energy sources to facilitate mixing.

In microfluidics, laminar flow mixing is a process where fluids mix turbulently within the channel.

In a Y-mixer, the two fluid streams are combined into a single stream by passing through a single straight channel.

Increasing the mean flow velocity in a passive diffusive micromixer will decrease the required channel length for complete mixing.