  We present a new derivation of relativistic dissipative hydrodynamic
equations, which invokes the second law of thermodynamics for the entropy
four-current expressed in terms of the single-particle phase-space distribution
function obtained from Grad's 14-moment approximation. This derivation is
complete in the sense that all the second-order transport coefficients are
uniquely determined within a single theoretical framework. In particular, this
removes the long-standing ambiguity in the relaxation time for bulk viscosity
thereby eliminating one of the uncertainties in the extraction of the shear
viscosity to entropy density ratio from confrontation with the anisotropic flow
data in relativistic heavy-ion collisions. We find that in the one-dimensional
scaling expansion, these transport coefficients prevent the occurrence of
cavitation even for rather large values of the bulk viscosity estimated in
lattice QCD.
