Droplets-laden turbulent flow downstream of a sudden pipe expansion has been investigated by using Euler/Euler two-fluid model for the gaseous and dispersed phases. Significant increase of heat transfer in separated flow at the adding of evaporating droplets has been demonstrated (more than 2 times compare with one-phase flow at the value of mass concentration of droplets M-L1 <= 0.05). Addition of dispersed phase to the turbulent gas flow results in insignificant increase of the reattachment length. Low-inertia droplets (d(1) <= 50 mu m) are well entrained into the circulation flow and present over the whole pipe section. Large particles (d(1) approximate to 100 mu m) go through the shear layer not getting into the detached area. Comparison with experimental data on separated gas-droplets flows behind the plane backward-facing step has been carried out. (C) 2009 Elsevier Ltd. All rights reserved.