2016
DOI: 10.2514/1.t4506
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Measurements of Oxygen Dissociation Using Laser Absorption

Abstract: The dissociation rate coefficient for oxygen in argon, O 2 Ar ⇌ O O Ar, was measured using laser absorption near 216 nm in the Schumann-Runge system in a shock tube. A mixture of 2% oxygen in argon was studied behind reflected shocks at initial equilibrium temperatures from 4400 to 7900 K and pressures from 0.2 to 1 atm. The dissociation was modeled decoupled from vibrational relaxation because dissociation was evident only after the test gas mixture was near vibrational equilibrium. The dissociation rate coef… Show more

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Cited by 12 publications
(4 citation statements)
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“…Because the mixture used was highly diluted, the effects of O 2 –O 2 and O 2 –O collisions were less important, despite being more efficient than O 2 –Ar collisions, k (O2–O2) ≈ 9 k (O2–Ar) and k (O2–O) ≈ 25 k (O2–Ar) . The dissociation rate coefficient due to argon, k (O2–Ar) , was taken from the work of Owen et al In their experiments, k (O2–Ar) (cm 3 /mol s) was measured behind reflected shock waves using laser absorption near 216 nm in the Schumann–Runge system of O 2 (2% O 2 –Ar, T = 4400–7900 K, P = 0.2–1 atm), yielding …”
Section: Kinetic Modelingmentioning
confidence: 99%
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“…Because the mixture used was highly diluted, the effects of O 2 –O 2 and O 2 –O collisions were less important, despite being more efficient than O 2 –Ar collisions, k (O2–O2) ≈ 9 k (O2–Ar) and k (O2–O) ≈ 25 k (O2–Ar) . The dissociation rate coefficient due to argon, k (O2–Ar) , was taken from the work of Owen et al In their experiments, k (O2–Ar) (cm 3 /mol s) was measured behind reflected shock waves using laser absorption near 216 nm in the Schumann–Runge system of O 2 (2% O 2 –Ar, T = 4400–7900 K, P = 0.2–1 atm), yielding …”
Section: Kinetic Modelingmentioning
confidence: 99%
“…In their work, Owen et al assumed the gas to be vibrationally equilibrated before the onset of dissociation (i.e., k d is defined by a single temperature). However, it is important to note that this assumption does not hold at higher temperatures where O 2 dissociation can occur under thermally nonequilibrated conditions with k d being a function of T tr and T v . , Figure shows the evolution of characteristic flow temperatures (left panel) and species concentration (right panel) for an example shock tube experiment hereafter denoted as “Case A” (see Table ).…”
Section: Kinetic Modelingmentioning
confidence: 99%
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