Non-Newtonian
flows and instabilities in 3D glass microfluidic devices
Simon J Haward and Amy Q Shen
OIST, Okinawa, Japan
Abstract
In this virtual
seminar we will discuss the use of selective laser-induced etching (SLE) for
the fabrication of glass microfluidic devices, in particular for the study of
non-Newtonian fluid dynamics problems [1]. SLE enables the precise monolithic
fabrication of three-dimensional (3D) channels and structures embedded in a
rigid and transparent fused-silica substrate, and thus provides opportunities
for a wealth of novel microscale flow experiments. We will highlight various
recent and ongoing microfluidic projects from our laboratory that have been
made possible by SLE fabrication. Our focus will be on flows of viscoelastic
wormlike micellar and polymer solutions in microscale geometries featuring, for
instance, slender rigid or cantilevered posts [2,3], 3D intersections [4,5],
and axisymmetric contraction/expansions [6]. We make use of state-of-the-art
quantitative techniques such as high-speed flow-induced birefringence imaging
and volumetric 3-component micro-particle image velocimetry to characterize and
understand purely-elastic and inertioelastic flow
instabilities arising in these complex systems.
[1] N Burshtein, ST Chan, K Toda-Peters, AQ Shen, SJ Haward (2019) 3D-printed glass microfluidics for fluid
dynamics and rheology. Current Opinion in Colloid and Interface Science 43:
1-14.
[2] SJ Haward, N Kitajima, K Toda-Peters, T Takahashi, AQ Shen
(2019) Flow of wormlike micellar solutions around microfluidic cylinders with
high aspect ratio and low blockage ratio. Soft Matter 15: 1927-1941.
[3] CC Hopkins,
SJ Haward, AQ Shen (2020) Purely-elastic fluid
structure interactions: Implications for mucociliary
flows. Small 16: 1903872
[4] N Burshtein, K Zografos, RJ Poole,
AQ Shen, SJ Haward (2017) Inertioelastic
flow instability at a stagnation point. Physical Review X 7: 041039
[5] SJ Haward, CC Hopkins, K Toda-Peters, AQ Shen (2019)
Microfluidic analog of an opposed-jets device.
Applied Physics Letters 114: 223701
[6] F Pimenta, K Toda-Peters, AQ Shen, MA Alves, SJ Haward (2020) Viscous flow through microfabricated axisymmetric contraction/expansion geometries. Experiments in Fluids, submitted.
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