The plasma chemical splitting of carbon dioxide (CO2) to produce monoxide (CO) in a pulsed corona discharge was investigated from both an experimental and numerical standpoint. High voltage nanosecond pulses were applied stream pure CO2 its mixture with argon, the gaseous products identified using Fourier transform infrared spectroscopy. Due shape pulses, process found proceed two phases. first phase is dominated by ionization, which generates high electron density. Then, during second...

The linear stability of a plane layer dielectric liquid subjected to an electric field and thermal gradient is studied. supposed have non-negligible residual conductivity exhibit injection charge from one the electrodes. Both effects are due dissolution given salt in liquid. ionic mobility constant temperature dependent. this configuration studied with help heuristic model precise discussion physical mechanisms instability made. Complete sets maps corresponding different cases presented.

A modified CO2 adsorbent is obtained by dry mixing of a Ca(OH)2 fine powder as received with commercial silica nanopowder. Silica nanoparticles form light agglomerates size the order tens microns, which are uniformly fluidizable. These act dispersants particles, coat nanoparticle likely due to contact charging. particles (CO2 adsorbent) thus provided vehicle for uniform fluidization. In this way, efficiency between and in fluidized bed greatly enhanced. Experimental results show that...

A complex plasma chemical and electrical model of a negative stationary wire-to-cylinder corona discharge in pure oxygen is presented. The assumed to have axial azimuthal symmetry. experimental current–voltage characteristic required as input data, but there are no other adjustable or empirical parameters. validation the results comes from its prediction ozone concentration. role played by different reactions species analysed detail using simulation. effect gas temperature decomposition at...

A semi-analytical model of a dc corona discharge is formulated to determine the spatial distribution charged particles (electrons, negative ions and positive ions) electric field in pure oxygen using point-to-plane electrode system. key point modeling integration Gauss' law continuity equation species along lines, use Warburg's current–voltage characteristics as input data boundary conditions. The predicted by compared with numerical solution obtained finite-element technique. solutions are...

The spatial distribution of the species generated in a wire-cylinder positive corona discharge pure oxygen has been computed using plasma chemistry model that includes most significant reactions between electrons, ions, atoms and molecules. is included continuity equations each species, which are coupled with Poisson's equation for electric field energy conservation gas temperature. current–voltage characteristic measured experiments used as an input data to numerical simulation. able...

The development and propagation of Trichel pulses in oxygen have been numerically simulated using an improved fluid particle-in-cell (PIC) method. numerical method has optimized to accurately reproduce sequences about 100 (∼1 ms). A classical one-dimensional model negative corona sphere-to-plane geometry used formulate the continuity equations for electrons ions. effects ionization, attachment secondary-electron emission from cathode all considered. electric field obtained solution Poisson's...

Ozone generation in pure oxygen using a wire-to-cylinder corona discharge reactor is experimentally and numerically investigated. concentration determined by means of direct UV spectroscopy the effects Joule heating ozone decomposition on electrodes are analysed for different gaps. The numerical model combines physical processes with chemistry formation destruction. chemical kinetics electrical coupled through Poisson's equation, current–voltage (CV) characteristic measured experiments used...

Abstract The Steady radial distribution of chemical species in a wire‐to‐cylinder ozone generator filled with pure oxygen has been computed by applying four different plasma chemistry models increasing complexity. most complete model considers ten (e, O2 +, −, O3 O−, O2, O2(1Δg), O2(1∑g +), O and O3) 79 reactions, including ionization electron impact, attachment detachment, electron-ion recombination, charge transfer, etc. is coupled the electrical through Poisson's equation. spatially...

Certain nonpolar liquids, when doped with specific salts, are able to produce sustained and reproducible ion injections from one of the electrodes. Electronic transfer ionic pairs attached electrodes subsequent extraction free ions by Schottky effect mechanisms responsible for this injection. The electrical conduction these liquids is studied, using a recently proposed electric-field dependent law injection Onsager theory dissociation in bulk. Recombination allowed between electrolytic...

Negative glow corona discharge in flowing oxygen has been numerically simulated for a wire-to-cylinder electrode geometry. The is modelled using fluid approximation. radial and axial distributions of charged neutral species are obtained by solving the corresponding continuity equations, which include relevant plasma-chemical kinetics. Continuity equations coupled with Poisson's equation energy conservation equation, since reaction rate constants may depend on electric field temperature....

Wire-to-plane positive corona discharge in air has been studied using an analytical model of two species (electrons and ions). The spatial distributions electric field charged are obtained by integrating Gauss's law the continuity equations along Laplacian lines. experimental values current intensity applied voltage, together with Warburg's law, have used to formulate boundary condition for electron density on wire. To test accuracy model, approximate distribution compared exact numerical...

Abstract The development of negative corona Trichel pulses in oxygen between a spherical cathode and plane is investigated using plasma chemical model ten selected species, which includes electrons, ions neutrals. interaction among these species described by that incorporates the most important processes, such as ionization, electron attachment detachment, impact dissociation excitation, clustering. spatio-temporal evolution charged neutral their reaction rates are evaluated along different...

An experimental model has been developed to give students hands-on experience with the fundamental laws of hemodynamics. The proposed setup is simple construction but permits precise measurements physical variables involved in experience. consists a series experiments where different basic phenomena are quantitatively investigated, such as pressure drop long straight vessel and an obstructed vessel, transition from laminar turbulent flow, association vessels vascular networks, or generation...

Ozone generation by negative DC corona discharge in N2-O2 mixtures has been experimentally investigated using a coaxial wire-cylinder reactor operating at room temperature and atmospheric pressure. The experiments have carried out under different gas flows (15 cm3 min−1 to 200 min−1) compositions (5% 90% of O2), the effect these parameters on current, ozone density efficiency generator analyzed. global rate coefficients for formation destruction also evaluated, their values compared with...

A generalization of the Thomson model to include field-enhanced dissociation in bulk (the Onsager effect) and unipolar charge injection, without recombination between electrolytic injected ions, is formulated for nonpolar dielectric liquids. In case an autonomous injection charge, approximate analytical solutions are given current densities. comparison with "exact" numerical solution done determine regions validity solutions. The general nonautonomous also investigated numerically.

The linear stability of a dielectric fluid filling cylindrical capacitor is analyzed. outer or the inner cylinders forming may rotate with fixed angular velocities, thus generating Taylor-Couette flow inside fluid. A weak, moderate strong injection charge assumed to occur at anode when high voltage applied electrodes. physical mechanisms associated instability steady are discussed. Special attention paid case mobility ions similar smaller than hydrodynamic