Reversible Stream Drop Transition in a Microfluidic Coflow System via On Demand Exposure to Acoustic Standing Waves,Physical Review Letters

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Reversible Stream Drop Transition in a Microfluidic Coflow System via On Demand Exposure to Acoustic Standing Waves
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-09-20 , DOI: 10.1103/physrevlett.127.134501
E Hemachandran ₁ , S Z Hoque ₁ , T Laurell ₂ , A K Sen ₁

Affiliation

Transition between stream and droplet regimes in a coflow is typically achieved by adjusting the capillary numbers (Ca) of the phases. Remarkably, we experimentally evidence a reversible transition between the two regimes by controlling exposure of the system to acoustic standing waves, with Ca fixed. By satisfying the ratio of acoustic radiation force to the interfacial tension force,

{Ca}_{ac} > 1

, experiments reveal a reversible stream drop transition for

Ca < 1

, and stream relocation for

Ca \geq 1

. We explain the phenomenon in terms of the pinching, advection, and relocation timescales and a transition between convective and absolute instability from a linear stability analysis [P. Guillot et al., Phys. Rev. Lett. 99, 104502 (2007)].

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