This paper presents an experimental and numerical study of a pulsed air plasma discharge at atmospheric pressure propagating in a capillary glass tube. In this work, we have compared the discharge structures and the axial propagation velocities of discharges. First, we have studied a needle-to-plane configuration without tube. For applied voltages in the range 7 − 18 kV, we have observed in exp...

.Hot metal gas forming of tubes can be used in various industries such as automotive and aerospace industries. In this process tube is formed at elevated temperatures, by using gas instead of fluid pressure. Lower required pressure and low power are its advantages in comparison to hydroforming process. In this paper, a hot metal gas bulging process of an aluminum alloy tube has been investigate...

Atmospheric pressure plasma jets have many beneficial effects in their use in surface treatment and, in particular, plasma medicine. One of these benefits is the controlled production of reactive oxygen and nitrogen species (RONS) in the active discharge through the molecular gases added to the primary noble gas in the input mixture, and through the interaction of reactive species in the plasma...

We demonstrate the utility of optically polarized Xe NMR in a convection cell for measuring the surface properties of materials. In particular, we show adsorption of xenon gas on oxidatively purified singleand multiwalled carbon nanotubes. The interaction between xenon and multiwalled nanotubes produced by chemical vapor deposition was stronger than that of singleor multiwalled nanotubes produc...

In flowering plant reproduction, pollen tube reception is the signaling system that results in pollen tube discharge, synergid degeneration, and successful delivery of male gametes (two sperm cells) to the site where they can fuse with female gametes (egg cell and central cell). Some molecules required for this complex and essential signaling exchange have been identified; however, fundamental ...

EZ, E,^, EP Results are reported from preliminary tests to evaluate the high power microwave electrothermal thruster (MET) fr concept, which employs a free-floating plasma discharge maintained by applied continuous wave (CW) microwave Hz, H,^, HP power to heat a propellant gas flow. Stable plasmas were created and maintained in helium (He), nitrogen (N 2), and hydrogen (H2) as propellants in bo...

Plasma technology is progressing rapidly, although there is still a need for much research and development. In situ diagnostics such as emission spectroscopy are set up to control the plasma processes. Two experiments concerning treatments of polymer and steel surfaces using a flowing post-discharge plasma of O2 and N2 are described. The diagnostics of O and N atom densities have been correlate...

in this paper, using a one-dimensional simulation model, the reforming process of sour gas, i.e. ch4, co2, and h2s, to the various charged particles and syngas in a dielectric barrier discharge (dbd) reactor is studied. an electric field is applied across the reactor radius, and thus a non-thermal plasma discharge is formed within the reactor. based on the space-time coupled finite element meth...