Experimental study of the flow pattern around a bubble confined in a microfluidic Hele-Shaw cell - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Conference Papers Year : 2017

Experimental study of the flow pattern around a bubble confined in a microfluidic Hele-Shaw cell

Abstract

The flow field around a bubble moving with respect to a surrounding liquid in a Hele-Shaw cell can usually be characterized by a recirculating flow, which is typically attributed to a Marangoni effect due to surface tension gradients generated by a non-uniform distribution of surfactants (or temperature) along the liquid-gas interface. In the present study, we try to visualize such a flow employing 3D micro-particle tracking velocimetry. We perform experiments on an immobile flattened air bubble that is surrounded by a flow of aqueous solution of surfactant (SDS), in a microfluidic chamber described in the work of Sungyon Lee et al. (Soft Matter, 2012, 8, 10750). The suspending fluid is seeded with spherical micro-particles, with those captured by the recirculating flow orbiting in a three-dimensional trajectory in the vicinity of the liquid-air interface. We address the effect of velocity of the surrounding fluid, surfactant concentration and bubble radius on the recirculating flow pattern. The case of a liquid-liquid interface, with a hexadecane drop as the dispersed phase, is also discussed.
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Dates and versions

cea-02340818 , version 1 (31-10-2019)

Identifiers

  • HAL Id : cea-02340818 , version 1

Cite

Yannis Tsoumpas, Christophe Fajolles, Florent Malloggi. Experimental study of the flow pattern around a bubble confined in a microfluidic Hele-Shaw cell. 70th Annual Meeting of the APS Division of Fluid Dynamics, Nov 2017, Denver, United States. ⟨cea-02340818⟩
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