Modeling of thermal radiation during zinc sulfide synthesis via combustion in a wet inert gas environment

We have presented the numerical results of calculations obtained with the help of a model of the ZnS combustion synthesis in a wet inert gas environment. The model was a modification of the model of the ZnS combustion synthesis on argon developed earlier. The results let us numerically and with the high accuracy estimate separately the heat transfers by both convection, conduction and thermal radiation during the combustion under the conditions stated in the heading. As a result, we are not only able to compare the heat transfers by the convection, conduction and thermal radiation, but also investigate in details the reason of much smaller heat transfer by radiation with respect to convection in the combustion system considered. On one hand, our results agree with data on relative values of heat transfer by convection, conduction and radiation, and on the other hand, they allow us to specify accurately the reason of a smallness of heat transfer by radiation more precisely and reasonably. We have concluded that this is a hot thin cloud of water vapors that is formed in a close vicinity of the igniter, absorbs radiation and prevents the other part of green mixture both from ignition by radiation and the subsequent propagation of the combustion on the basis of radiation heat transfer. In the presented paper a modification of the previous research results was carried out which allows taking into account the influence of water vapor on the radiation heat transfer process during the synthesis of zinc sulfide. At sufficiently high concentration of vapors the model explains the abnormally low values of effective gas permeability coefficients calculated without taking into account the indicated effect.We have presented the numerical results of calculations obtained with the help of a model of the ZnS combustion synthesis in a wet inert gas environment. The model was a modification of the model of the ZnS combustion synthesis on argon developed earlier. The results let us numerically and with the high accuracy estimate separately the heat transfers by both convection, conduction and thermal radiation during the combustion under the conditions stated in the heading. As a result, we are not only able to compare the heat transfers by the convection, conduction and thermal radiation, but also investigate in details the reason of much smaller heat transfer by radiation with respect to convection in the combustion system considered. On one hand, our results agree with data on relative values of heat transfer by convection, conduction and radiation, and on the other hand, they allow us to specify accurately the reason of a smallness of heat transfer by radiation more precisely and reasonably. We have concluded...