Microreactor designed for efficient plasma-liquid segmented flows

doi:10.1039/d4lc00315b

Microreactor designed for efficient plasma-liquid segmented flows

2024-01-01

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DOI：10.1039/d4lc00315b

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Microreactors were designed for gas-liquid plasma chemical processes and operated under segmented flows in a high aspect ratio (8.76) rectangular microchannel. First, the hydrodynamics of the gas-liquid flows generated at a T-junction was investigated for fifteen solvents commonly used in organic synthesis. The classical literature scaling laws were revised to describe the dependence of bubble and slug lengths, and bubble residence time on the liquid nature by introducing their liquid vapour pressure. Liquid film thickness and liquid residence time were estimated from residence time distribution experiments. Secondly, plasma could be successfully generated in these segmented flows for all the liquids. Due to the plasma dissipation of thermal energy, gas phase temperature increased and induced the lengthening of bubbles and the decrease in bubble residence time. The flow pattern was also impacted by the gas temperature increase. A flow map describing the evolution of the flow pattern under plasma conditions was built, enabling prediction of the flow pattern based on the liquid boiling point and dielectric constant. These microreactors have demonstrated great potential, and by adapting the synthesis solvent or the operating plasma conditions, they could find promising applications in gas-liquid plasma chemical processes. A microreactor working with gas-liquid segmented flows for controlled biphasic hydrodynamics in plasma chemical process applications.

Keywords:

DIELECTRIC BARRIER DISCHARGE

ATMOSPHERIC-PRESSURE

MASS-TRANSFER

TAYLOR FLOW

2-PHASE FLOW

LONG BUBBLES

INTERFACIAL AREA

LOW-TEMPERATURE

GAS-BUBBLES

WATER

Microreactor designed for efficient plasma-liquid segmented flows

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