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Micro-/Nano-fluid dynamics

Artificial microswimmers moving by diffusiophoresis

Artificial swimmer moving by diffusiophoresis

Credit: Tom Montenegro-Johnson and Eric Lauga

 Some artificial microswimmers exploit diffusiophoresis to self-propel. Chemicals react with catalysts on the swimmer surface, driving a surface flow that pushes the swimmer forwards. Fast, accurate and simple calculation of the dynamics of such particles is possible with a regularised boundary element method. Here, we see the surface concentration and resultant flow streamlines of a system comprising two unit spheres with uniform surface activity and mobility [paper] [software].


 

Hydrodynamic interactions in microfluidic channels

 Hydrodynamic interactions in microfluidic channel

Credit: Karolis Misiunas