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In this paper, a simple numerical method to solve the General Dynamic Equation (GDE) has been described and the software made available. The model solution described is suitable for problems involving gas to particle conversion due to supersaturation, coagulation, and surface growth of particles via evaporation/condensation of monomers. The model is based on simplifying the sectional approach to discretizing the particle size distribution with a nodal form. The GDE developed here is an extension of the coagulation equa tion solution method developed by Kari Lehtinen (Lehtinen and Zachariah, 2001) wherein particles exist only at nodes, as opposed to continuous bins in the sectional method. The results have been tested by comparison where simple analytical solutions are available, and are shown to be in excellent agreement. By example we apply the model to the formation and growth of Aluminum particles. The important features of the model is that it is simple to comprehend, the software which we call Nodal-GDE Solver (NGDE) is relatively compact, and the code is well documented internally, so that users may apply it to their specific needs or make modifications as required. 2
Prakash et al. (Wed,) studied this question.