John Ernest Harry

Application of a rotating high-pressure glow discharge for the dissociation of hydrogen sulfide

The dissociation of hydrogen sulfide has been studied in an atmospheric-pressure glow discharge rotating between concentric electrodes in an axial magnetic field. Though the electrodes were heated to remove the sulfur formed in the discharge, stable operation was possible. The characteristics of the discharge and the influence of experimental parameters on the conversion of hydrogen sulfide and the energy efficiency are reported.

Multilayer plasma patterns in atmospheric pressure glow discharges

We report observation of self-organized multilayer plasma patterns formed along the length of an atmospheric pressure glow discharge generated over a wide frequency range from 10-100 kHz.

Electrothermal Cutting Processes Using a CO 2 Laser

The application of lasers to industrial electrothermal processes is discussed together with the factors affecting the choice of laser. The use of gas jet assistance in cutting applications is described, and the influence of gas jet assistance on the cutting rate and cut quality for metals and nonmetals is shown.

Multilayer plasma patterns in paralleled and coupled atmospheric glow discharges

We report observations of multilayer plasma patterns in multiple atmospheric glow discharges sustained simultaneously with a single power supply. Depending on operation conditions, these atmospheric glow plasmas either operate in parallel, seemingly independent of one another, or undergo structural coupling. In both scenarios, multilayer structures are observed. These self-organized plasma patterns are stable and their presence remains even when individual atmospheric glow plasmas couple with one another.

Low Power Autoselective Regeneration of Monolithic Wall Flow Diesel Particulate Filters

This paper presents research into a novel autoselective electric discharge method for regenerating monolithic wall flow diesel particulate filters using low power over the entire range of temperatures and oxygen concentrations experienced within the exhaust systems of modern diesel engines. The ability to regenerate the filter independently of exhaust gas temperature and composition significantly reduces system complexity compared to other systems. In addition, the system does not require catalyst loading and uses only massproduced electronic and electrical components, thus reducing the cost of the after-treatment package. Purpose built exhaust gas simulation test rigs were used to evaluate, develop and optimise the autoselective regeneration system. On-engine testing demonstrated the performance of the autoselective regeneration process under real engine conditions. Typical regeneration performance is presented and discussed with the aid of visual observations, particulate mass measurements, back pressure measurements and energy consumption. The research demonstrates the potential of the novel autoselective method for diesel particulate filter regeneration. The autoselective process does not require an exhaust by-pass and enables the system to be low power, catalyst-free and exhaust temperature independent.

Schlieren visualization of spark generated shockwaves in narrow channels

Summary form only given. Recently there has been an increased interest in shock wave behavior and shock-wall interaction in microscale channels and tubes. Micro- and millimeter sized shock waves are of significance in a variety of modern applications, such as miniature combustion, jets and shock tubes, explosives, laser shock processing and medical devices. Due to the small scale of the confinement heat transfer to the walls and friction play an important role for shock behavior.