William E. McDermott

Exact and approximate solutions of the utilization and yield equations for O2(1delta) generators

A mathematical model for the production of singlet delta oxygen from the reaction of a gas containing chlorine with the hydroperoxy ion in liquid basic hydrogen peroxide is reviewed. An exact solution for the Cl2 utilization, O2(1(Delta) ) yield, and efficiency of the generator is obtained in the well-stirred limit (WSL) for which the surface concentration of HO2- is constant. A universal set of performance curves is presented and the implications when assessing generator performance are discussed. When depletion of the surface concentration of HO2- is important, perturbation theory is used to obtain a solution for the generators utilization, yield, and efficiency which is a generalization of the corresponding WSL solution. A criterion for the validity of the perturbation solution is obtained and it is shown that the performance of a rotogenerator plateaus not too far above the value of disk rotation rate predicted by this criterion. Finally an integral method is used to obtain a simple, but approximate, solution of the utilization-yield equations which applies over a wide range of operating conditions.

Generation of singlet delta oxygen: a technology overview

The rate of generation of O 2 ( 1 (Delta) g ) using the chlorine-basic hydrogen peroxide reaction is a key element to predict the performance of the chemical oxygen iodine laser. O 2 ( 1 (Delta) g ) carries the energy in the laser, thus is one of the prime determinants of power in the flow. To predict the performance of O 2 ( 1 (Delta) g ) generators requires the prediction of the utilization of chlorine, the yield of excited oxygen, and the concentration of potential contaminants in the chemical exhaust of the generator. In essence, this is a standard problem in two phase flow. This paper is in the spirit of a review and describes the authors approach to the analysis to O 2 ( 1 (Delta) g ) generators.

Generation of O 2 (a 1 Δg): a survey update

In this paper I will review work in the development of Singlet Delta Oxygen Generators. I start out with an historical background as several recent reviews were from different perspectives than mine. The basic chemistry and generator performance for chlorine-BHP production of O2(a1(Delta) g) is covered. Finally, I discuss how generator yield influences laser performance and some questions from recent work.

Thermal effects in singlet delta oxygen generation

The generation of O2(1(Delta) g) using the chlorine--basic hydrogen peroxide reaction is the heart of the chemical oxygen iodine laser. When O2(1(Delta) g) is generated, almost two-thirds of the exothermicity of the reaction is dissipated as heat within the liquid solution. The impact of this heat release on the generation and transport of O2(1(Delta) g) is the subject of this study.

Generation of singlet delta oxygen--a technology update

The rate of generation of O2(1(Delta) g) using the chlorine-basic hydrogen peroxide reaction is a key element to predict the performance of the chemical oxygen iodine laser. O2(1(Delta) g) carries the energy in the laser, thus it is one of the prime determinants of power in the flow. To predict the performance of O2(1(Delta) g) generators requires the prediction of the utilization of chlorine, the yield of excited oxygen, and the concentration of potential contaminants in the chemical exhaust of the generator. This paper is an extension of a previous paper on this same topic. The reader is also referred to a companion paper in this conference which discusses the details of O2(1(Delta) g) production and yield.