In this paper we present a numerical code developed for droplet vaporization and burning analysis of a single droplet in a quiescent atmosphere. Computations are performed under varying ambient conditions. Special attention is given to the vaporization of oxygen droplet in a hydrogen atmosphere. We first describe the numerical approach, boundary conditions and assumptions made for physico-chemical properties modeling and then discuss numerical results. Attention is focused on the modelization of the mass diffusion coefficient in the very neighborhood of the critical conditions. Results show that under certain ambient conditions the critical regime is reached, but no abrupt change in the mean vaporized mass flow rate is noticed between sub- and supercritical regimes. For the burning case, condensation of water in the neighborhood of droplet surface was considered. Systematic computations were performed at different ambient pressures and temperatures.
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