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Pecularities of isentropic expansion of warm dense matter (WDM) created byintense energy fluxes are under discussion in situation when thermodynamictrajectory of such expansion crosses binodal of liquid-gas phase transition andexpansion within two-phase region is going along equilibrium branch of theisentrope for two-phase mixture . It is known for the case of plane geometry(Anisimov, Inogamov et al. 1999) that because of sharp break of the expansionisoentrope at boiling point there appears extended zone (liquid layer) ofuniformity for expanding material with constant thermodynamic and kinematicparameters, which corresponds to the state on binodal. General properties ofsuch boiling (binodal) layer were claimed and discussed before for the cases ofisentropic expansion of infinite sample as well as for finite plane andspherical samples (slab and ball) and for the system of well positioned slabs(stuck target). Thermodynamic and kinematic parameters of discussed binodallayer are studied in present paper with the use of simplest Van der Waalsequation of state (EOS). Advantage of VdW-EOS is possibility of demonstrableand semi-analytical description of thermo- and hydrodynamics of the process.Current work studies phenomenon in planar case of isentropic expansion offinite sized layer (slab) of VdW-matter.

Binodal layer in isentropically expanding slab target with van der Waals equation of state