An evaporation model of a droplet has been constructed with the concern of the droplet under supercritical or near critical condition. The thermodynamic process involving liquid phase and gas phase as well as "blurred" state of the droplet around the critical point is integrated into a general framework. Thermodynamic properties and transport coefficients are modeled as functions of pressure, temperature and composition of the mixture. These functions and the equations of state are formulated over the range covering gas phase, liquid phase, and supercritical state. Numerical implementations of the model were made for an oxygen droplet in a hydrogen gas surrounding. Preliminary numerical results have demonstrated the feasibility of the concept even though further validation of the model is necessary when experimental data are available.
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