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An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation

An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation

Published on: November 3, 2016

Microreactor designed for efficient plasma-liquid segmented flows.

Pierre Dedieu¹, Gabriel Morand¹, Karine Loubière²

¹Institut de Recherche de Chimie Paris, UMR 8247, 2PM Group, Chimie ParisTech-PSL, PSL Université Paris, CNRS, 11 rue Pierre et Marie Curie, 75005 Paris, France.

|July 10, 2024

Summary

This study explores microreactors for gas-liquid plasma processes. Optimized reactor design and operating conditions enable predictable flow patterns for efficient chemical synthesis.

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Area of Science:

Chemical Engineering
Plasma Science
Fluid Dynamics

Background:

Microreactors offer precise control for chemical synthesis.
Gas-liquid plasma processes require understanding complex flow dynamics.
Optimizing segmented flow in microchannels is crucial for efficiency.

Purpose of the Study:

To investigate hydrodynamics and plasma behavior in microreactors for gas-liquid plasma chemical processes.
To revise scaling laws for bubble and slug dynamics based on liquid properties.
To develop a predictive flow map for microreactor operation under plasma conditions.

Main Methods:

Designed and operated microreactors with a high aspect ratio rectangular microchannel.
Investigated gas-liquid flow hydrodynamics at a T-junction using fifteen organic synthesis solvents.
Utilized residence time distribution experiments to estimate liquid film and residence times.
Generated plasma in segmented flows and analyzed its impact on gas temperature and flow patterns.

Main Results:

Revised scaling laws incorporating liquid vapor pressure to predict bubble and slug characteristics.
Demonstrated successful plasma generation across all tested liquids.
Observed plasma-induced increases in gas temperature, bubble lengthening, and reduced bubble residence time.
Developed a flow map correlating flow patterns with liquid boiling point and dielectric constant under plasma conditions.

Conclusions:

Microreactors are effective for gas-liquid plasma chemical processes.
Liquid properties significantly influence hydrodynamics, requiring revised scaling laws.
Plasma conditions alter flow patterns, predictable via a developed flow map.
These microreactors show promise for diverse gas-liquid plasma chemical applications.