Numerical modeling of negative corona discharge in pure carbon dioxide

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 View publica ion s a sView publica ion s a s