Micromixing Work - RA

Question 1

Project

Answer 1

I worked as R.A for joint the project titled, “Numerical Analysis visualization and experimental measurement of capillary driven blood flow and microchannel mixing”.

We proposed a novel design of micromixer called Split and Recombine micromixer with offset inlets, its performance analysis and comparison with other micromixers was carried out. At low Re values 90% of MI was obtained which is 40% higher than the serpentine SAR micromixer.

Question 2

Design, Performance analysis and Comparison

Answer 2

Novel Design was proposed -
it was having three features - offset inlets, two-layer and split & recombine

Analysis
MI and Pressure drop. MI from variance of mass fraction

Equations solved
Continuity, Navier-stokes, Transport equation

Ansys CFX 15
Mesh - Ansys ICEM CFD uniform structured mesh Nodes - 1.6 million
BC - Inlet1 - Uniform Velocity Ethanol, Uniform Velocity Water
Outlet - Static Pressure Zero
walls - No-slip condition
Re - 0.01 - 100

Question 3

Blood -

and

different models

Answer 3

RBCs, WBCs, Platelets suspended in plasma

Shear thinning fluid - becomes less viscous as it moves
(Pseudoplastic)

Carreau-Yasuda Model
Casson Model
Herschel Bulkley Model
Power law Model

Question 4

what is micromixing? advantages? applications?

challenges?

Answer 4

fluid flow where characteristic changes are taking place at microns
advantages - small samples, small size, fast response, low cost
applications- diagnostics, drug delivery, enzyme reactions, DNA sequencing

mixing by diffusion - slow
geometries that manipulate the fluid flow
obstruction type, curved or spiral paths, split and recombine type geometries