Progress in Plasma Processing of Materials, 1999
ISBN Print: 1-56700-126-2
ENTHALPY PROBE MEASUREMENTS: INTERACTION BETWEEN PLASMA JETS AND ENTRAINED ATMOSPHERE
DOI: 10.1615/ITPPC-1998.510
pages 339-345
Аннотация
Turbulent thermal plasma jets, such as those used for D.C. plasma spraying, are strongly affected by the ambient gas entrainment which cools down the jet and modifies its
temperature, velocity and composition distributions when spraying in air. It can modify the thermomechanical properties of the sprayed coatings with the surface oxidation of the particles in flight and that of the "splats" and passes. To understand better the involved
phenomena, the surrounding air entrainment in plasma jets has been studied for an Ar/H2 plasma forming gas mixture by using an enthalpy probe coupled with a mass spectrometer. The effect of a nozzle shield has been tested with a laboratory designed torch. The injection of
air as carrier has also been studied. The used set-up has allowed the simultaneous determination of velocity, temperature and gas concentration distributions in the plume of plasma jets. Certain designs of nozzle shields allow to reduce the quantity of entrained air.
Begell Recommend
Electrospinning of Micro- and Nanofibers: Fundamentals in Separation and Filtration Processes Y. FilatovA. Budyka
V. Kirichenko ISBN Print: 978-1-56700-241-6
ISBN Online: 978-1-56700-240-9
Thermal Radiation in Disperse Systems: An Engineering Approach Leonid A. Dombrovsky
Dominique Baillis ISBN Print: 978-1-56700-268-3
ISBN Online: 978-1-56700-351-2