Electrolyte and temperature effects in a rising bubble

Mandalahalli, Manas M.; Lif, Johan; Mudde, Robert F.; Portela, L.M.

doi:10.1016/j.ces.2022.118276

Cited by 4 publications

(1 citation statement)

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“…The gas bubble nucleated from the surface of the porous medium or was injected by a needle. [8,14,[16][17][18]28,29] However, consistently producing a single isolated bubble in a complex microchannel environment remains a considerable challenge, as conventional methods prove inadequate for scales below 50 μm due to issues such as heat dissipation, significant uncertainties, and other inaccuracies.…”

Section: Introductionmentioning

confidence: 99%

Dislodgement of Hydrogen Bubbles in Microchannels with Embedded Pillars: An Analytical, Experimental, and Numerical Study

Gräfner,

Huang,

et al. 2024

Advanced Materials

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Microchannels with integrated pillars have enhanced the production capabilities and performance of various applications due to their high surface‐to‐volume ratio. However, emerging gas bubbles can become trapped, potentially limiting the functionality or efficiency of the device when scaled down to the low‐micrometer scale. Understanding the conditions required to dislodge these bubbles is thus critical for optimizing microfluidic devices with complex physical behaviors. This study presents an analytical model that outlines the dislodgment conditions and driving forces for such gas–liquid flows. These terms are derived from the gas–liquid interface properties, geometry, and processing parameters. As the density of the pillar arrangement is scaled down, the resistance to bubble dislodgment typically increases. Nevertheless, the bubble is compelled to dislodge at lower pressure loads when critical volumes are reached. This newly discovered effect is particularly noticeable in densely packed arrays and can be explained by the interplay of increased surface tension, geometrical restrictions, and volume‐preserving forces. The analytical terms and effects are validated through novel experimental and numerical methods tailored for microchannels in the low‐micrometer scale, showing strong agreement.This article is protected by copyright. All rights reserved

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