10-2 10-1
0.0
0.2
0.4
0.6
0.8
1.0
1.2
e (×4)
O−(×1500)
O−
3(×400000)
CO−
4 (×103)
CO−
3
Nega i e ion densi y (108cm-3)
Radial dis ance, (cm)
0.8
Fig. 1: Radial dis ibu ion o elec ons and nega i e ions a exi
o he cylinde .
Nume ical modeling o nega i e co ona discha ge in pu e ca bon dioxide
K.Yanallah1, F. Pon iga2, A.Fe nández-Rueda2, A.Cas ellanos3 and Y.Meslem1
1Labo a oi e de Génie Physique, Uni e si é de Tia e , Alge ia
2Dp . Física Aplicada II and 3Dp . Elec ónica y Elec omagne ismo, Uni e sidad de Se illa, Spain
1. In oduc ion
Co ona discha ge is p esen in many indus ial
p ocesses, such as in he ea men o polyme ilms, he
p oduc ion o ozone o he decomposi ion o gaseous
pollu an s [1]. In his pape , ou a en ion will be ocused
on he use o wi e- o-cylinde nega i e co ona discha ge
o he decomposi ion o ca bon dioxide. As i is well
known, CO2 is a g een house gas ha con ibu es o he
global wa ming o Ea h a mosphe e. In addi ion, his gas
is he majo cons i uen o Ma ian a mosphe e [2].
The e o e, he s udy o i s decomposi ion by means o
elec ical discha ges and i s ans o ma ion in o he
compounds has a double in e es : i can help o he
de elopmen o new echnologies aiming o he educ ion
CO2 emissions, and i can p o ide impo an clues on he
p esence o ace gases in he Ma ian a mosphe e (like
ozone) ha a e essen ial o li e suppo ing.
2. Nume ical model
Co ona discha ge is modeled as a s a iona y and
homogeneous discha ge in he axial and azimu hal
di ec ions [3]. On he basis o a hyd odynamic model,
he elec ical discha ge is simula ed using a se o
con inui y equa ions ha desc ibe he gene a ion and
des uc ion o cha ged and neu al species due o he
chemical eac ions a each poin o he in e -elec ode
gap. This se o equa ions is coupled o Poisson’s
equa ion and he hea equa ion. The chemical model
includes 21 species (e, O+, O2+, O3+, CO2+, O−, O2−,
O3−, CO3−, CO4−, O, O2 O3, O(1D), O2(1∆g), O(1Σg+),
O2
*, O3
*, CO, C and C2O) and a o al numbe o 47
eac ions. The selec ion o eac ions was based on he
s udy o So ia and al. [4] and Miko iny and al. [5].
3. Resul s
The nume ical esul s p esen ed in his sec ion we e
ob ained o 1 a m and 298 K. The axial gas low a e
h ough he cylinde was aken as Q = 100 cm3/min and
he applied ol age was se o V = 6 kV.
The adial dis ibu ions o elec ons and nega i e ions
a he ou le o cylinde a e p esen ed in Fig. 1. The
s uc u e o he elec ical discha ge is e y simila o ha
in pu e oxygen, which has been p e iously s udied [3, 4].
The in e -elec ode space is di ided in o h ee egions:
ac i e, ioniza ion and d i egion. In he d i egion, he
p incipal cha ge ca ie is CO3−, and in lesse deg ee
CO4− and O3−.
Ca bon dioxide is decomposed by he impac o
ene ge ic elec on p o ided by he elec ical discha ge,
e + CO2 → CO + O + e. (R1)
Molecula oxygen, which is necessa y o he
p oduc ion o ozone, is gene a ed acco ding o p ocess,
O + O + CO2 → O2 + CO2. (R2)
O he adicals and exci ed species a e also o med in he
ac i e egion and hen di use owa d he ou e elec ode
(see Fig. 2). Mos o hese adicals a e also p oduced by
di ec elec on impac dissocia ion and exci a ion o CO2
and O2. Finally, ozone is mainly gene a ed ia a h ee-
body eac ion o O and O2, wi h CO2 ac ing as he hi d
body pa ne ,
O + O2 + CO2 → O3 + CO2. (R2)
Re e ences
[1] B Eliasson and U Kogelscha z, IEEE T ans Plasma Sci
19 1063–77 (1991).
[2] L Kal enegge , M F idlund, J Kas ing P oc o he 36 h
ESLAB Symp, 277-282 (2002).
[3] K Yanallah e al. J Phys D: Appl Phys 41 195206 (8pp)
(2008).
[4] C So ia e al. Plasma Sou ces Sc. Technol 13 95 (2004).
[5] T Miko iny e al. J Phys D: Appl Phys 37 64 (2004).
Acknowledgmen
This wo k has been suppo ed by he Spanish Agency o
In e na ional De elopmen and Coope a ion (AECID).
Fig. 2: Radial dis ibu ion o neu al species a exi o he
cylinde .
10-2 10-1
104
107
1010
1013
1016
1019
O2
O
O(1D)
O2(1Σg)
CO
O2(1∆g)
O3
O*
2
O*
3
C
C2O
Neu al species densi y (cm-3)
Radial dis ance, (cm)
0.8
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