A numerical study on particle growth in choked capillary nozzle flow

This work presents the results of one- and two-dimensional numerical analys is of a choked capillary flow and the analysis of particle formation and gr owth in a capillary. The object of this study was to determine conditions o f seed particle growth and homogeneous nucleation. The Lagrangian approach was used for the calculation of droplet growth, and vapor depletion and lat ent heat release were considered in the calculation of the two-dimensional flow field. Several parameters were derived from the analysis of the flow f ield and the growth rate of the droplet, and their effects are discussed. I t was found that the viscous pressure loss during the expansion has a signi ficant effect on both heterogeneous and homogeneous condensation. The diffe rence in the results between one- and two-dimensional calculations is also discussed and conclusions are presented.