Monodisperse approximation in the metastable phase decay
  A new simple method for the first order phase transition kinetics is suggested. The metastable phase consumption can be imagined in frames of the modisperse approximation for the distribution of the droplets sizes. In all situations of the metastable phase decay this approximation leads to negligible errors in the total number of droplets appeared in the system. An evident advantage of the presented method is the possibility to investigate the situation of the metastable phase decay on several sorts of heterogeneous centers. 
V.Kurasov