Active medium of a chemical oxygen-iodine laser

A numerical simulation was carried out to investigate the process of gas‐liquid reaction in a jet‐type singlet oxygen generator by using volume‐of‐fluid coupled with large eddy simulation. The coupled hydrodynamic and reaction simulations provide detailed information about the reacting flow. Results reveal that the reaction aggravates the jet instability and affects the jet structure significantly due to the differential pressure around the liquid jet. The effects of gas velocity on chlorine conversion and the yield of singlet oxygen were investigated. The key is the increasing of the interface area rather than the convection. This numerical simulation study is convenient for the design of singlet oxygen reactors and the research of gas‐liquid two‐phase flow with reaction.

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“…where the rate of singlet oxygen quenching in the gas phase is considered as constant

k_{3}^{'}

= 1.2 × 10 4 m 3 kmol −1 s −1 . From experimental data, 30 % singlet oxygen in the liquid phase is quenched.…”

Section: Mathematical Model and Numerical Algorithmmentioning

confidence: 99%

Numerical Investigation of Gas‐Liquid Reacting Flow in a Jet‐Type Singlet Oxygen Generator

Chen

Liu

et al. 2020

Chem Eng & Technol

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“…Table 1) was used to construct the chemical rate terms. 5,[11][12][13][14] The complete set must still be augmented by the thermal balance.…”

Section: ∂[I * ]mentioning

confidence: 99%

<title>Magnetic modulation of subsonic COIL</title>

Beránek

Rohlena

2010

SPIE Proceedings

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A variable magnetic field was incorporated into a 1D model of subsonic COIL model with a mixing length to include its influence on the stimulated emission cross-section and other lasing parameters. The model includes a fairly complete chemical kinetics of energy transfer from the excited molecular oxygen to the injected iodine, accounting also for the gas temperature effect and a simplified mixing description of oxygen and iodine molecules. The variable magnetic field transforms the CW regime in a pulsed operation. The numerical procedure gives a possibility to tackle an arbitrary temporal dependence of the imposed magnetic field and to calculate directly the response of the laser output. The calculation was focused on the experimental data measured with the subsonic version of the COIL device in the Institute of Physics, Prague, modulated by a saw-tooth magnetic pulses. Although the model gives a reasonable agreement for the CW regime it is difficult to match the exact shape of the measured magnetically switched laser pulses with the calculated one. In this contribution we shall demonstrate various additional refinements of the model to improve the agreement with the measured pulse shape.

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“…Table 1) was used to construct the chemical rate terms. 7,[9][10][11][12] The complete set must still be augmented by the thermal balance.…”

Section: Laser Modelmentioning

confidence: 99%

Modelling of subsonic COIL with an arbitrary magnetic modulation

Beránek

Rohlena

2006

XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers

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The concept of 1D subsonic COIL model with a mixing length was generalized to include the influence of a variable magnetic field on the stimulated emission cross-section. Equations describing the chemical kinetics were solved taking into account together with the gas temperature also a simplified mixing model of oxygen and iodine molecules. With the external time variable magnetic field the model is no longer stationary. A transformation in the system moving with the mixture reduces partial differential equations to ordinary equations in time with initial conditions given either by the stationary flow at the moment when the magnetic field is switched on combined with the boundary conditions at the injector. Advantage of this procedure is a possibility to consider an arbitrary temporal dependence of the imposed magnetic field and to calculate directly the response of the laser output. The method was applied to model the experimental data measured with the subsonic version of the COIL device in the Institute of Physics, Prague, where the applied magnetic field had a saw-tooth dependence. We found that various values characterizing the laser performance, such as the power density distribution over the active zone cross-section, may have a fairly complicated structure given by combined effects of the delayed reaction to the magnetic switching and the flow velocity. This is necessarily translated in a time dependent spatial inhomogeneity of output beam intensity profile.

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Active medium of a chemical oxygen-iodine laser

Cited by 6 publications

References 3 publications

Numerical Investigation of Gas‐Liquid Reacting Flow in a Jet‐Type Singlet Oxygen Generator

Numerical Investigation of Gas‐Liquid Reacting Flow in a Jet‐Type Singlet Oxygen Generator

<title>Magnetic modulation of subsonic COIL</title>

Modelling of subsonic COIL with an arbitrary magnetic modulation

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