Microdischarges may be produced in various geometries, in various gas mixtures, and with various types of power supplies, from DC to microwave. They are not easy to diagnose (because of their small size) and numerical simulations are useful to understand the physics of such discharges. However, numerical simulations usually require long calculations that are not suitable for large parameter space exploration. In this paper, we will evaluate the benefit of global (volume-averaged) models to describe the physics of microdischarges. Two examples will be detailed: the so-called MHCD (Micro-Hollow Cathode Discharge), and an RF capacitive discharge at atmospheric pressure, sometimes called APPJ (for Atmospheric Pressure Plasma Jet) in the literature.
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