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Chemkin 4.1.1 Chapter 4: Materials Problems Figure 4-27 Steady-state Chlorine Plasma—Cl and Cl 2 Mole Fractions Figure 4-28 shows a rate-of-production analysis for the input gas Cl 2 . In this case, there are clear major and minor pathways. The primary reaction consuming molecular chlorine is gas-phase reaction #3, which is the electron-impact dissociation to two Cl atoms. Gas reactions #5 and 2, the electron-impact ionization and dissociative attachment reactions of Cl 2 , respectively, are minor channels for Cl 2 consumption. The primary reaction producing Cl 2 is surface reaction #4, the reaction between gasphase and adsorbed Cl atoms producing molecular chlorine in the gas phase. Gas reaction #18, the neutralization reaction between Cl - and Cl + 2 , and surface reaction + #2, the neutralization of Cl 2 on the wall, are minor channels for Cl 2 production. Figure 4-28 Steady-state Chlorine Plasma—ROP Analysis © 2007 Reaction Design 144 RD0411-C20-000-001
Chapter 4: Materials Problems <strong>Tutorials</strong> <strong>Manual</strong> 4.3.2 Spacial Chlorine Plasma PFR with Power Profile 4.3.2.1 Project Description This user tutorial presents an example of a Plasma Plug Flow Reactor with a specified power versus distance profile. This feature might be used to model an experimental apparatus where the inductive coils providing the power are spaced unevenly. Alternatively, this could be used to model a system where there is a lower-power region where a probe is used that cannot operate in a high-plasma density region, or where a measurement window is located. This example is for a plasma at a total pressure of one torr with pure chlorine gas flowing into the reactor at 35 cm 3 /s, using the chlorine plasma chemistry set described in Section 4.4.5. The electron energy equation is solved, and there is consideration of heat loss through the wall of the reactor. The area used for surface chemistry and heat loss corresponds to the physical walls of the tubular reactor. 4.3.2.2 Project Setup The project file is called plasma_pfr__cl_power_profile.ckprj. The data files used for this sample are located in the samples\plasma_pfr\cl_power_profile directory. This reactor diagram contains a gas inlet, a Plasma Plug Flow Reactor, and an outlet. The reactant gas mixture is input on the Species-specific Property tab of the C1_Inlet1 panel. Although the input gas is actually pure Cl 2 , in order to have the plasma “light” in the simulation, we have modified the inlet gas to include a small amount of electrons and ions in the inlet gas. The Reactor Physical Property tab of the C1_ Plasma PFR panel is where problem type and reactor parameters such as pressure, temperatures, geometry, heat loss, and plasma power are entered. The value for the electron temperature input on the Reactor Physical Property tab of the C1_ Plasma PFR panel is used as the inlet electron temperature. The plasma power profile can be entered by using the Profile tool or by selecting an existing profile file on the Reactor Physical Property tab of the C1_ panel. This is an alternative to entering a constant value for the Plasma Power Deposition parameter. The profile is entered as a list of pairs of numbers giving the power as a function of position. Values at intermediate points are straight-line interpolations of the two nearest specified values. Unphysically abrupt changes in the power profile can cause convergence problems in the simulation unless solver time steps are set accordingly. Note that the power deposition for a plug-flow reactor profile must be specified in per-distance units, as it will be integrated over the channel distance. RD0411-C20-000-001 145 © 2007 Reaction Design
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Chemkin 4.1.1 Contents Table of Con
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Chemkin 4.1.1 Tables List of Tables
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Tutorials Manual 4.1.1 Figures List
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List of Figures Tutorials Manual 2-
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Chemkin 4.1.1 1 1 Introduction The
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Chemkin 4.1.1 2 2 Combustion in Gas
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Chapter 2: Combustion in Gas-phase
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Chemkin 4.1.1 3 3 Catalytic Process
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