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This program aims at developing a mathematical model, and a computer code based on this model, which will allow prediction of the product distribution in chemical reactors in which gaseous silicon compounds are converted to condensed phase silicon. The reactors to be modeled are flow reactors in which silane or one of the halogenated silanes is thermally decomposed or reacted with an alkali metal, H/sub 2/ or H atoms. Because the product of interest is particulate silicon, processes which must be modeled, in addition to mixing and reaction of gas-phase reactants, include the nucleation and growth of condensed Si via coagulation, condensation, and heterogeneous reaction. Work has centered on obtaining working versions of the particle ''chemistry'' (nucleation, coagulation, evaporation, and condensation) routines within the large code. The nucleation model in particular proved troublesome; efforts to debug it have led to the writing of a smaller independent nucleation code. This smaller code allows the model to be examined in more detail than is possible in the large code. This model is discussed in detail. A considerable amount of time was also spent during this period on streamlining the LAPP code to allow accommodation of the large number of equations describing particlemore » processes. This effort has been successful in reducing memory requirements by as much as 50%.« less

Development of a model and computer code to describe solar grade silicon production processes. Third quarterly report, April 1, 1978--June 30, 1978