4:00 PM - 6:00 PM
▲ [14p-P9-30] Investigation of microplasma discharge process in sea water
Keywords:Microplasma, Plasmas in liquid, Bubble
Due to a wide range of possible applications there is a need in operating plasmas under various conditions. Plasmas and microplasmas in highly-conductive liquids are poorly investigated and mostly only used in application oriented studies, for that reason more detailed analysis of the microplasma discharge process in highly-conductive is required. This work proposes a micro-gap plasma discharge in a highly-conducive sea water under various conditions and reports on discharge characteristics and results of the discharge process modeling.
For the experiments, artificial sea water consisting of ten typical components (10ASW, electrical conductivity 45.1 mS/cm at 20.3°C) was used. A needle(Pd)-to-plane(Pt) electrode system was sunk into liquid in a quartz cuvette. The needle was 50 μm in tip radius. The gap between electrodes was ranged from 10 to 40 μm.
Model was solved in two blocks. First block is RLC oscillation model (for estimation of current and voltage vaveforms) with defined steps in time and second block is a local process in the discharge gap (for estimation of heating and conductivity of water) for each step of the first block.
In the second block calculation of electric field strength distribution in the discharge gap was performed, based on voltage calculated in the current step of the fist block. Obtained value of liquid conductivity on current step is used in next step of first block.
Mathematical model shows good agreement with experimentally measured current and voltage waveforms until the moment of breakdown, however estimation of breakdown moment time is complicated, due to not complete at this stage model of bubble formation process.
For the further analysis it is necessary to introduce complete bubble formation and dynamics block to the model, to make computation of process independently to the experimental data.
For the experiments, artificial sea water consisting of ten typical components (10ASW, electrical conductivity 45.1 mS/cm at 20.3°C) was used. A needle(Pd)-to-plane(Pt) electrode system was sunk into liquid in a quartz cuvette. The needle was 50 μm in tip radius. The gap between electrodes was ranged from 10 to 40 μm.
Model was solved in two blocks. First block is RLC oscillation model (for estimation of current and voltage vaveforms) with defined steps in time and second block is a local process in the discharge gap (for estimation of heating and conductivity of water) for each step of the first block.
In the second block calculation of electric field strength distribution in the discharge gap was performed, based on voltage calculated in the current step of the fist block. Obtained value of liquid conductivity on current step is used in next step of first block.
Mathematical model shows good agreement with experimentally measured current and voltage waveforms until the moment of breakdown, however estimation of breakdown moment time is complicated, due to not complete at this stage model of bubble formation process.
For the further analysis it is necessary to introduce complete bubble formation and dynamics block to the model, to make computation of process independently to the experimental data.