Environmental Engineering Reference
In-Depth Information
Figure 6.14
A particle structure formed in striations of glow discharge [34].
Figure 6.15
Structures of particles formed in an inductively coupled discharge with an inductor
of special construction [108].
This construction provides forces on the boundary of a radio-frequency plasma di-
rected upward, which leads to specific structures of dust particles injected in this
plasma. Some structures of this type are represented in Figure 6.15. Along with
electric forces, thermophoretic forces due to temperature gradients may be used
for equalizing the gravitational force. A complex structure of particles formed in
stratified glow discharge is represented in Figure 6.16 [109]. Thus, there are vari-
ous possibilities to have a trap in a gas discharge plasma that allows one to obtain
some structures of particles. These structures are a convenient model for study of
the solid-liquid phase transition and some hydrodynamic effects in gas and liquid
flows [110].
We note that fluxes of electrons and ions to the particle surface determine both
theparticlechargeandscreeningoftheparticleCoulombfieldbyplasmaions.
