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Motion of particles entrained in a plasma jet
Author(s) -
Lewis J. A.,
Gauvin W. H.
Publication year - 1973
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690190515
Subject(s) - jet (fluid) , plasma , mechanics , reynolds number , nozzle , argon , acceleration , drag , particle (ecology) , flow velocity , thermal velocity , chemistry , physics , atomic physics , flow (mathematics) , turbulence , classical mechanics , thermodynamics , nuclear physics , oceanography , geology
The motion of small particles (glass microspheres, 30 to 140 microns in diameter) entrained in a free argon plasma jet was studied by means of high‐speed cine streak photography. Radial temperature and velocity profiles as well as axial profiles of temperature, velocity, and argon concentration in the jet were experimentally determined by means of a plasma calorimetric probe. The system was found to be characterized by low relative Reynolds numbers (0.2 to 20) and extremely high deceleration rates (about –2,000 g). Under these conditions, an increase of drag coefficient over that predicted by the standard curve was experimentally observed. This increase was attributed to the nonsteady flow field around the particle (the so‐called “history term” in the equation of motion). A general computer program has been proposed which predicts the particle velocity, acceleration and temperature along its trajectory.