SKM 2021 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DY: Fachverband Dynamik und Statistische Physik
DY 5: Poster Session III: Statistical Physics, Complex Fluids and Soft Matter
DY 5.15: Poster
Dienstag, 28. September 2021, 17:30–19:30, P
Topological optimization of microfluidic Tesla valves for applications with low Reynold numbers — •Sebastian Bohm1, Hai Binh Phi2, Ayaka Moriyama3, and Erich Runge1 — 1TU Ilmenau, FG Theoretische Physik I, DE — 2TU Ilmenau, FG Mikrosystemtechnik, DE — 3Carleton College, Physics Department, USA
Passive
Tesla valves represent a
promising method for rectifying flows in
microfluidic systems because no moving parts are needed.
The efficiency
of the valves is characterised by the diodicity which can be defined as the pressure drop ratio
of the forward and the reverse flow direction.
To obtain efficient valve designs, topological optimization has proven to be a particularly suitable method [1].
The challenge
is the dependency of the diodicity
on the Reynolds number. Normally, the valves are only efficient at Reynolds numbers much greater than 100.
In microfluidics, Reynolds numbers are usually very
low, which hitherto limits the applicability of Tesla valves.
Therefore a novel approach for the topological optimization of
valves that work at very small Reynolds numbers is presented:
To ensure that the optimization yields meaningful
designs, a customized objective function is introduced and a multi-stage optimization procedure is used.
In addition, a method is presented to optimize the diodicity
over a given range of Reynolds numbers simultaneously.
The resulting valves achieve a diodicity of up to 2 already at Reynolds numbers smaller than 20.
The simulated predictions are in close agreement to experimental results.
[1] S. Lin et al.,
Topology Optimization of Fixed-Geometry Fluid Diodes, J. Mech. Des., 137 (8), (2015)