Lin Lie

Characteristics of Gliding Arc Discharge Plasma

A gliding arc discharge plasma and its characteristics are described. Analysis of the production principle of the plasma is presented. Some experimental results about two novel types of the gliding arc plasma generator have been obtained. These types of gliding arc plasma are potentially usable in the chemical industry and environmental engineering.

Characteristics of Plasma Spraying Torch with a Hollow Cathode

A kind of plasma spraying torch with a hollow cathode is described in this paper. The plasma torch can be used for axial powder injection in plasma spray studies. The arc characteristics of the plasma torch with various gas flowrates, different gas media, are presented. The mathematical modeling and computational method are developed for predicting the temperature and velocity field inside the plasma torch.

Terahertz Wave Confinement in Pillar Photonic Crystal with a Tapered Waveguide and a Point Defect

We demonstrate a photonic crystal cavity with a tapered waveguide and a point defect to highly confine terahertz waves. The terahertz wave is first guided into the tapered waveguide, gradually compressed to its end, and finally confined in the point defect cavity. Numerical simulations with the finite-difference time-domain method indicate that the narrow band terahertz wave is highly confined in the point defect cavity with a quality factor of 5323. The demonstrated device may be used as an antenna for enhancing light-matter interactions in the point defect cavity at terahertz frequencies and may improve the sensitivity of terahertz near-field microscopy.

Propagation Properties of Electromagnetic Wave in a Plasma Slab

In this paper, the calculated results about the propagation properties of electromagnetic wave in a plasma slab are described. The relationship of the propagation properties with frequencies of electromagnetic wave, and parameters of plasma (electron temperature, electron density, dimensionless collision frequency and the size of the plasma slab) is analyzed.

Analysis of Instabilities in Non-Equilibrium Plasmas

Plasma instabilities with charged particle production processes in non-equilibrium plasma are analysed. A criterion on plasma instabilities is deduced by first-order perturbation theory. The relationship between plasma instabilities and certain factors (degree of non-equilibrium in plasma, the electron attachment rate coefficient and electron temperature) are described.

Numerical Investigation on the Flow and Temperature Fields in an Inductively Coupled Plasma Reactor

This paper gives a numerical study on the flow and temperature fields in an induced plasma reactor, which worked in 0.5 ATM with air as a working gas. We employed a two-dimensional mode of an inductively coupled plasma to calculate the temperature and flow field of the reactor as well as the generator. The algorithm is based on the solutions of the two-dimensional continuity, momentum, and energy equations in term of vorticity, stream function and enthalpy. An upwind finite-difference scheme was adopted to solve those equations with appropriate boundary conditions. The computed results show that there is a flat region with little parameter change in the reactor, that the diameter of the region is not much larger than that of the generator and that a deep change of parameter exists in the outer side of the region.

A thermal analysis of characteristic parameters in the electrode-region for tubular plasma generators

A thermal analysis of characteristic parameters in the electrode-region for tubular plasma generators is developed. Results of calculation on temperature of electrodes, evaporation rate and erosion rate for different electrode materials are presented as a function of arc current, pressure of arc chamber, width of arc root and velocity of water coolant. Some experimental data on electrode erosion in a tubular plasma generator is given. The effects of operating parameters on erosion rate are discussed in detail.A thermal analysis of characteristic parameters in the electrode-region for tubular plasma generators is developed. Results of calculation on temperature of electrodes, evaporation rate and erosion rate for different electrode materials are presented as a function of arc current, pressure of arc chamber, width of arc root and velocity of water coolant. Some experimental data on electrode erosion in a tubular plasma generator is given. The effects of operating parameters on erosion rate are discussed in detail.