Effects Of Electrode Decoration And Electrode Gap On Corona Discharge Induced Wind

Corona discharge ionic wind device has a wide application in the fields of heat dissipation,drying,aerodynamics and microelectronic devices.In recent years,the main researches of this field includes the study of electrode structure,such as the use of metal wire,metal mesh as discharge electrode,some scholars have prepared nano-materials as discharge electrode;the factors affecting the ionic wind performance have also been extensively researched,such as voltage polarity,relative humidity and other parameters on the ionic wind performance.In addition,there are more and more researches about the heat dissipation mechanism of ionic wind and the experimental equipment have been optimized continuously to enhance the heat dissipation capacity of ionic wind.In this thesis,the effect of electrode modification on corona discharge was studied by using the"needle-cylinder"electrode configuration.Nano-materials such as CNTs and TiO₂ were coating onto the tips of corona discharge needle electrode.The micro-morphology of the electrode surface and the electric field distribution near the discharge electrode have been changed.The surface of discharge tip was modified with CNTs and TiO₂ nano-materials,the onset voltage decreased from 7.5 kV to 4.9 kV,and the maximum wind speed reached 2.3 m/s.In addition,we found that CNTs modified electrode could significantly reduce the ozone concentration generated from 1.5 ppm to almost 0 ppm.The improvement of ionic wind performance is mainly attributed to the high aspect ratio of CNTs and the modification of the surface morphology of titanium dioxide film.The effect of electrode spacing on ionic wind performance was studied by using a novel perpendicular"needle-needle"electrode configuration which occupied small volume and saved materials.The novel apparatus was also easy to operate.The script was used to indirectly measure the actual output wind speed,so that we can see the change of the wind speed vividly.We found that the higher the electrode spacing was,the higher the opening voltage was,and the lower the slope of the conductor-voltage curve was,which were consistent with the reported results.Finally,the application of ionic wind generator in cooling and drying aspects was studied and the cooling effect of our ion wind blower was very obvious.As for ionic wind drying,the sample with water content of nearly 60%at the start of ionic wind blowing leaved only about 4.5%of the residual moisture after 100 minutes.While the sample without applying ionic wind samples was almost 30%of water in 100 minutes'drying.Although the laboratorial ionic wind generator seems clumsy and the cooling and drying procedures of practical application also very simple,the results of the experiment prove that our ionic wind experiment device has the strong ability for sample cooling and drying,and these results have reference value for industrial application of ionic wind.