Temperature-induced migration of a bubble in a soft microcavity

Temperature-induced migration of a bubble in a soft microcavity

We perform studies of pancake-like shaped bubbles submitted to a temperature gradient in a micrometric height Hele-Shaw cell. We show that under the experimental conditions, usually found in microfluidic devices, the temperature-induced dilation of the cavity overcomes the thermocapillary convection...

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Veröffentlicht in:Physics of fluids (1994) 2011-05, Vol.23 (5), p.052002-052002-12
Hauptverfasser: Selva, Bertrand, Cantat, Isabelle, Jullien, Marie-Caroline
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Sprache:eng
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Applied fluid mechanics
Exact sciences and technology
Fluid Dynamics
Fluidics
Fundamental areas of phenomenology (including applications)
Physics
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container_end_page 052002-12
container_issue 5
container_start_page 052002
container_title Physics of fluids (1994)
container_volume 23
creator Selva, Bertrand
Cantat, Isabelle
Jullien, Marie-Caroline
description We perform studies of pancake-like shaped bubbles submitted to a temperature gradient in a micrometric height Hele-Shaw cell. We show that under the experimental conditions, usually found in microfluidic devices, the temperature-induced dilation of the cavity overcomes the thermocapillary convection due to surface tension variation, effectively driving the bubble toward the cold side of the cavity. The bubble velocity is experimentally characterized as a function of the bubble radius, the temperature gradient, and the initial Hele-Shaw cell thickness. We propose a theoretical prediction of the bubble velocity, based on the analytical resolution of the hydrodynamical problem. The equations set closure is ensured by the pressure value near the bubble and by the dissipation in the moving meniscus.
doi_str_mv 10.1063/1.3590743
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subjects Applied fluid mechanics
Exact sciences and technology
Fluid Dynamics
Fluidics
Fundamental areas of phenomenology (including applications)
Physics
title Temperature-induced migration of a bubble in a soft microcavity
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