Effect of area ratio of the primary nozzle on steam ejector performance considering nonequilibrium condensations

The formation and evaporation of nanodroplets in steam ejectors is neglected many numerical simulations. We analyse the influence a primary nozzle on ejector performances considering phase change processes. model validated detail against experimental data supersonic nozzles available literature. results show that first nonequilibrium condensation observed within nozzle, while under-expanded flow causes second nucleation-condensation process to achieve large liquid fraction 0.26 ejector. compression steep decrease degree subcooling leading droplet evaporations. processes repeat alternatively depending behaviour mixing section. increasing area ratio leads transition structure from flows over-expanded diameter about 7 nm constant section entrainment can reach approximately 0.75 for an 8, which achieves good performance