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Thermodynamic and transport properties of nuclear fireball created in thecentral region of heavy-ion collisions below 400 MeV/nucleon are investigatedwithin the isospin-dependent quantum molecular dynamic (IQMD) model. Theseproperties including the density, temperature, chemical potential, entropydensity ($s$) and shear viscosity ($\eta$), are calculated by a generalized hotThomas Fermi formulism and a parameterized function, which was developed byDanielewicz. As the collision goes on, a transient minimal$\eta/s=5/4\pi-10/4\pi$ occurs in the largest compression stage. Besides, therelationship of $\eta/s$ to temperature ($T$) in the freeze-out stage displaysa local minimum which is about 9-20 times $1/4\pi$ around $T$ = 8-12 MeV, whichcan be argued as indicative of a liquid gas phase transition. In addition, theinfluences of nucleon-nucleon (NN) cross section ($\sigma_{NN}$) and symmetryenergy coefficient ($C_{s}$) are also discussed, and it is found that theresults are sensitive to $\sigma_{NN}$ but not to $C_{s}$.

Thermodynamic properties and shear viscosity over entropy density ratio of nuclear fireball in a quantum-molecular dynamics model