Tutorials Manual

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Chemkin 4.1.1 Chapter 4: Materials Problems The reactant gas mixture, which is pure Cl 2 in this case, is input on the Speciesspecific Property tab of the C1_Inlet1 panel. The initial guess for the steady-state gas composition, which is input on the Initial Gas Fraction subtab of the Species-specific Data tab of the C1_ Plasma PSR panel, is quite important. A good initial guess (one that is close to the steady-state solution) will result in fast convergence, while a poor initial guess can at worst lead to failure of the simulation. The Reactor Physical Property tab of the C1_ Plasma PSR panel is where problem type and reactor parameters such as pressure, temperatures, volume, area, heat loss, and plasma power are entered. Solving the electron energy equation requires that an initial guess for the electron temperature be input on this tab, as well as an inlet electron temperature on the Stream Property tab of the C1_Inlet1 panel. The latter has no impact on the solution unless there are electrons in the inlet gas mixture. The Sheath Loss parameter describes the ion energy gained crossing the sheath and may be specified differently for each material in the system. On the Solver panel, skipping the intermediate fixed-temperature solution is usually more robust for plasma simulations than trying to solve it first. 4.3.1.3 Project Results Figure 4-25 shows the electron temperature as a function of power for this chlorine plasma. The electron temperature shows only small changes over the large variation in plasma power, since most of the power is transferred into ionization and dissociation rather than electron heating. However, as the plasma power drops the electron temperature rises as the plasma nears extinction, since there are fewer electrons and electron-driven events. The mole fractions of the electrons and positive ions, increase steadily with increasing plasma power, as shown in Figure 4-26, but the chlorine negative ions show a maximum at intermediate powers. Figure 4-27 shows that the net dissociation of molecular chlorine to atomic chlorine steadily increases with increasing plasma power, as expected. © 2007 Reaction Design 142 RD0411-C20-000-001
Chapter 4: Materials Problems <strong>Tutorials</strong> <strong>Manual</strong> Figure 4-25 Steady-state Chlorine Plasma—Electron Temperatures vs. Power Figure 4-26 Steady-state Chlorine Plasma—Mole Fractions RD0411-C20-000-001 143 © 2007 Reaction Design
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August 3, 2007 1:53 am Release 4.1.
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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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List of Figures Tutorials Manual 4-
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Chemkin 4.1.1 1 1 Introduction The
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Chapter 1: Introduction Tutorials M
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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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