  Using the semiclassical quantum Boltzmann equation (QBE), we numerically
calculate the DC transport properties of bilayer graphene near charge
neutrality. We find, in contrast to prior discussions, that phonon scattering
is crucial even at temperatures below 40K. Nonetheless, electron-electron
scattering still dominates over phonon collisions allowing a hydrodynamic
approach. We introduce a simple two-fluid hydrodynamic model of electrons and
holes interacting via Coulomb drag and compare our results to the full QBE
calculation. We show that the two-fluid model produces quantitatively accurate
results for conductivity, thermopower, and thermal conductivity.
