Affiliations: Plasma Technology Research Center (CRTP), Department
of Chemical Engineering, Université de Sherbrooke, Sherbrooke
(Québec) J1K 2R1, Canada.
Abstract: Flow visualization is a key tool for the study of thermal plasma
flows. Because of their high temperature and associated self emission, standard
and high speed photography is commonly used for flow and temperature field
visualization. Tracer techniques through the injection of a seed powder in the
plasma flow have also been often used for the study of flow structure.
Shadowgraphs and Schlieren techniques have been used particularly when cold
flow regions are present in the close proximity of the plasma discharge. They
also provide key information about the flow structure in the fringes of the
discharge. Laser strobe techniques are commonly used for the characterization
of particle trajectories under plasma conditions. A brief review is presented
of available plasma and particulate diagnostic techniques with detailed
measurements reported for a radio frequency (r.f.) induction plasma discharge
using enthalpy probe techniques.