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Heat and momentum transport to particulates injected into low-pressure (~80 mbar) nonequilibrium plasmas

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2 Author(s)
Chang, C.H. ; Dept. of Mech. Eng., Minnesota Univ., Minneapolis, MN, USA ; Pfender, E.

An analytical model for plasma flow around a spherical particle has been developed using a two-temperature chemical nonequilibrium approach that includes rarefaction and particle-charging effects. The contribution of each component of the plasma to the heat and momentum transfer to injected particulates is studied by simulating the plasma flow around a sphere for conditions typical of thermal spray processes at pressures from 80 mbar to 1 bar. A parametric study of the 80-mbar case is also presented for free-stream velocities in the 0-3000 m/s range and free-stream temperatures in the 8000-12000 K range for both ionization equilibrium and nonequilibrium. The results demonstrate that there are departures from kinetic and ionization equilibrium in the plasma around a particle, and that heat transfer to a particle can be enhanced by the increased ion flux to the particle surface when the surrounding plasma is in ionization nonequilibrium

Published in:

Plasma Science, IEEE Transactions on  (Volume:18 ,  Issue: 6 )

Date of Publication:

Dec 1990

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