Low-power atmospheric-pressure surface-wave microwave discharge in contact with batch and flowing liquids
Résumé
Abstract The operation mode and the characteristics of fully and partially confined surface-wave microwave discharges (SWDs) are determined in the case of freely propagating plasma column and in contact with liquid, respectively. It is shown that the contraction and filamentation of the low-power SWD depend on the input power and gas flow conditions, and are related to the power absorption and radial temperature gradients. The power dependent length of the plasma column shortens with filamentation. The partially confined SWD retains the operation properties of fully confined discharge under the same conditions inside the discharge tube, while outside the tube the discharge contraction and its length are controlled by the air inflow into the plasma plume. As a result of air inflow the electron density increases, and it is further enhanced when brought in contact with water. The water surface hinders the propagation of the surface-wave, thus in the shortened plasma column the power absorption per unit length increases. The contraction of plasma plume ceases when brought in contact with liquid surface, and the filaments cover a surface area comparable to that of the discharge tube. The afterglow flow follows the liquid meniscus and it is deflected accordingly at the edge of the container, while influences the vapour admixture into the plasma and enhances the interfacial processes along the liquid surface.
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