A state-of-the-art 3+1 dimensional cascade + viscous hydro + cascade model vHLLE+UrQMD has been applied to heavy ion collisions in RHIC Beam Energy Scan range i1" class="mathmlsrc">i1.gif&_user=111111111&_pii=S0375947416001172&_rdoc=1&_issn=03759474&md5=cc5343deb5eb98e66ac351b525ee355d">i1.gif">. Based on comparison to available experimental data it was estimated that an effective value of shear viscosity over entropy density ratio η/s in hydrodynamic stage has to decrease from η/s=0.2 to 0.08 as collision energy increases from to 39 GeV, and to stay at η/s=0.08 for .
In this work we show how an equation of state with first order phase transition affects the hydrodynamic evolution at those collision energies and changes the results of the model as compared to “default scenario” with a crossover type EoS from chiral model.