Research On Dielectric Barrier Discharge In The Two Phase Mixture

Dielectric Barrier Discharge (DBD) is widely used in industry application, such as surface process, environment protection. It is pity that the systematic theoretical research on DBD in Two-Phase Mixture(TPM) can rarely be found. For better application in industry, it is necessary to study the TPM-DBD. This paper is focused on two parts: one is the electric model of gas DBD, the other is the experiment on TPM-DBD.The present DBD electric model can simulate only one kind current, most of which is the single peak discharge current, but DBD current operates in diverse modes at different parameters, either one peak current or multi peaks current. In order to present the character of DBD, an electric model including an inductor is proposed. The model not only can simulate the single peak current, but also multi peak current. The number of peak is varying as the frequency changes. Furthermore, with different parameter of L and Cmem, a curve is obtained. The left zone of the curve is multi peak current zone; the right zone is single current zone. Beside, at the fixed Cmem and frequency, the current changes from the multi peak into single peak as the inductance L increases. The frequency is higher; the choice of L and Cmem is more widely. Basing on the curve, we explain the variety of the discharge when the distance of gap or the frequency is changes; the conclusion is conclusion with the existing experiment result.The gas-solid TPM-DBD is different from gas DBD. Firstly, the gas-solid TPM-DBD is corona discharge. The current amplitude is larger than the discharge of gas DBD .Because the distribution of the solid is stochastic; the pattern of TPM-DBD is irregular. Secondly, the density of the solid influences the characteristic of TMP-DBD. When the density of solid is small, the discharge is similar with gas DBD. If the density is proper, the discharge consists of microdischarge and corona. Once the gap is packed by the solid, the discharge is corona and the pulse amplitude is smaller than the gas DBD ones. The gas-mist TMP-DBD is characteristic with the polarity effect. The current amplitude during the positive half period is larger than that of the negative half period. ????????????????????????????????????????????????????????????? Comparing gas-mist TMP-DBD and the flow gas DBD, the polarity effect is brought by the mist. Similarly, we don't find the regular patter in gas mist TMP-DMD.