the disclosure relates to an apparatus and method for producing nanofibers and non - woven nanofibrous materials from polymer melts , liquids and particles using a two - phase flow nozzle . the process comprises supplying a first phase comprising a polymer melt and a second phase comprising a pressurized gas stream to a two - phase flow nozzle ; injecting the polymer melt and the pressurized gas stream into a mixing chamber within the two - phase flow nozzle wherein the mixing chamber combines the polymer flow and pressurized gas into a two - phase flow ; distributing the two - phase flow uniformly to a converging channel terminating into an channel exit wherein the converging channel accelerates the two - phase flow creating a polymeric film along the surface of the converging channel and fibrillating the polymeric film at the channel exit of the converging channel in the form of a plurality of nanofibers .