Coupling of methane in the present of hydrogen to C 2 hydrocarbons operated at atmospheric pressure in order to evaluate a newly-developed plasma reactor with rotating poly tip electrodes, in which circular glow discharge plasma zone between a stator and a rotor with poly tip electrodes is vertical to the way of the stream of flowing reactants. No substantial amount of carbon formation was observed on the surface of the electrodes after a long period of the reaction(>1 h) when the molar ratio of feed flow of CH 4∶H 2 is 1∶1 and the A.C. glow discharge at 20 kHz, input power of 856 V(rms). C 2 hydrocarbons single pass yield is 42.6%, in which C 2H 2 38.9% and C 2H 4 3.5% respectively, with 62.3% methane conversion but with carbon formation when input power is 1010 V(rms).
Numerical simulation is described which estimates the performance of thulium sensitized holmium doped CW fluoride fiber laser at 2.04 μm for both core and cladding pumped. This model takes into account the mechanisms of cross relaxation and energy transfer to describe the laser operation. A subroutine program for calculating the absorption rate of cladding pumped scheme is included in the model. The losses of signal and pump light along the fiber have been taken into account. The test of cladding pumped scheme program shows good agreement with the experimental result. The experimental results of core pumping Tm Ho doped fiber laser in fluoride host are compared with the present model, and shows a good agreement with calculations. This model also provides data of the optimum parameters for the configuration of the efficient cladding pumped Tm Ho fluoride laser systems.
