Highly efficient jet O<sub>2</sub>(<sup>1</sup>Δ) generator

Загидуллин, М. В.; Kurov, A Yu; Kupriyanov, N L; Николаев, В. Д.; Svistun, M I; Erasov, N V

doi:10.1070/qe1991v021n07abeh003939

Cited by 24 publications

(6 citation statements)

References 5 publications

(11 reference statements)

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“…(26,30,32,33), the temporal profiles for Oa(a), 12, and I*, are shown in Figure 4. The approximate solutions agree quite favorably with the numerical solutions over a broad range of iodine fraction and water content, 4 < 0.2 and W < 0.2.…”

Section: Comparison Of Analytical and Numerical Solutionsmentioning

confidence: 99%

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Approximate analytic solution for the dissociation of molecular iodine in the presence of singlet oxygen

Perram

1995

Int J of Chemical Kinetics

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A computational study including sensitivity, nondimensional, and steady-state analyses of the gas-phase kinetics associated with Chemical Oxygen-Iodine Lasers (COIL) was performed to develop a simplified kinetic model and assess kinetic limitations to laser performance. A minimal set of 13 reactions is developed that adequately describes the time evolution of the major chemical constituents of a COIL device. A characteristic time for the dissociation of molecular iodine by singlet oxygen is established in terms of iodine fraction, water content, yield of singlet oxygen, and rate parameters. Finally, an approximate analytic solution to the iodine dissociation problem is established for a broad range of reagent concentrations. The current study is limited in applicability due to the exclusion of chemical heat release and reactive mixing phenomenon. 0 1995 John Wiley & Sons, Inc.

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Section: Comparison Of Analytical and Numerical Solutionsmentioning

confidence: 99%

“…The dissociation then rapidly accelerates as I* replaces O2(a) as the dominate partner for production of 1; [22][23][24]311. This dissociation process removes at least 2, and sometimes as many as 6-18, OZ(a) molecules per dissociated 12 …”

Section: Coil Gas-phase Kineticsmentioning

confidence: 99%

Approximate analytic solution for the dissociation of molecular iodine in the presence of singlet oxygen

Perram

1995

Int J of Chemical Kinetics

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“…An elementary annular volume of the jet has an inner diameter a, outer diameter D, length 1x, and mass zlm. Motion of the elementary volume along the x-axis can be described as a balance between d'Alembert, gravitational, and drag forces (1 ) zlm d2x/dt2 = zlmg0 -Fdrag where x is a distance measured from injection point along the jet, zim = (ir/4)(D2-a2) Ar p, g0 = 9.81 m/sec2, and Fdrag is a drag force (2) Fdrag C1 LIX P (dx/dt) 2 with c1 being the coefficient of skin-friction. Estimation of c1 is difficult since only limited data and theories exist for filaments or wires immersed in fluids.…”

Section: Basic Theory Of Filament-guided Jetsmentioning

confidence: 99%

“…Jet Singlet Oxygen Generators (J-SOG) are frequently used sources of singlet oxygen in Chemical Oxygen Iodine Lasers (COIL) [1,2,3,4,5,6]. In J-SOG, a flow ofchlorine (or chlorine carrying gas) is injected into a dense array of fast flowing jets of basic hydrogen peroxide (BHP), in either cross-flow or counter-flow configurations ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Singlet oxygen generator with filament-guided jets

Vetrovec

1998

SPIE Proceedings

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“…I've already mentioned Dave Neumann's successful supersonic laser. Marciel Zagidullin's invention of the jet generator was another major step [27]. Sani Yoshida's demonstration of greater than 40% laser efficiency showed COIL could be engineered to very high efficiency.…”

Section: An Explosion Of Researchmentioning

confidence: 99%

Historical perspective of COIL

McDermott

2002

Gas and Chemical Lasers and Intense Beam Applications III

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The oxygen-iodine laser was the first electronic transition chemical laser. It first lased 25 years ago at the Air Force Weapons Laboratory (now the Air Force Research Laboratory). The development started several years earlier and involved the support of many people in the laser community. I would like to describe the early thoughts, insights and even misconceptions that we had in the early days. I will also highlight the contributions of many of the people and organizations that contributed to the early development of the COIL laser. A Brief Background on 02( 1 Ag)Chemical sources of O2(Ag) have been known for many years. Mallet [1] first reported the red glow obtained when hypochlorite solution and hydrogen peroxide was mixed. The O2(Ag) molecule was first identified by Herzberg in the spectrum of the sun in 1934. Groh [2] mentions the red chemiluminescence obtained when gaseous chlorine or bromine is added to basic hydrogen peroxide. Later, Groh & Kirriman [3] mixed gaseous chlorine with KOH and hydrogen peroxide and proposed that the red glow is from two O2('Ag) molecules colliding. Later, Seliger [4] published the spectra of the hypochlorite -peroxide reaction in the red at 634 nm. For me, the seminal article on excited oxygen was Khan and Kasha [5]. Even though the chemical process that produced a metastable electronically excited species was known, the marriage of oxygen and iodine came in discharge studies. Iodine and O2(CAg)The reaction of iodine and discharged oxygen was first reported by Ogryzlo and his group [6]. They observed that when iodine was added to excited oxygen, a bright yellow glow was seen. This was recognized as 12 B state emission. They also observed a strong emission at 1.315 ýi, the iodine atom 2 P 1 / 2 2 P3/ 2 transition. The excitation of the iodine was attributed to the near resonant pumping by 02( 1 Ag) . The iodine atoms were thought to be formed by the dissociation of molecular iodine by O2(Tu). This work didn't attract the-attention of the laser community until later. In 1969, Elmer Ogryzlo went on sabbatical to Brian Thrush's laboratory in England. There he suggested the oxygen-iodine system as an interesting system for Thrush's graduate student, R. G. Derwent. The suggestion generated several papers [7], [8], [9], [10], and [11]. In their third paper, they suggested that an inversion could be achieved on the iodine atom 2 pv 2 -2 P 3 / 2 transition if a sufficient O2(Ag) fraction could be produced. Using the equilibrium constant for the energy pumping reaction, They showed a flow containing about 15% O2(OAg) could produce an inversion on the iodine 2 P 112 -2 P 3 / 2 transition. It was radical to propose an equilibrium as a pumping reaction -in a two level system terminating in the ground state! was looking for research projects of interest to the Air Force. I had visited the AFWL the previous year and met a number of the technical people there. In the summer of 1973, I began working on electronic transition chemical lasers. The initial funding for the effort was $1...

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Highly efficient jet O₂(¹Δ) generator

Cited by 24 publications

References 5 publications

Approximate analytic solution for the dissociation of molecular iodine in the presence of singlet oxygen

Approximate analytic solution for the dissociation of molecular iodine in the presence of singlet oxygen

Singlet oxygen generator with filament-guided jets

Historical perspective of COIL

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Highly efficient jet O2(1Δ) generator

Cited by 24 publications

References 5 publications

Approximate analytic solution for the dissociation of molecular iodine in the presence of singlet oxygen

Approximate analytic solution for the dissociation of molecular iodine in the presence of singlet oxygen

Singlet oxygen generator with filament-guided jets

Historical perspective of COIL

Contact Info

Product

Resources

About

Highly efficient jet O₂(¹Δ) generator