  We analyze from a microscopic point of view the feasibility of a hydrodynamic
regime in a type-I Weyl semimetal driven by electron-electron interactions
mediated by virtual phonons. Considering also the effects of of impurities and
the absorption/emission of real phonons, the electric and thermal
conductivities are derived. At temperatures $T$ above the Bloch-Gr\"uneisen
temperature $T_\textrm{BG}$, virtual phonons behave similarly to real phonons,
but the Lorenz ratio is modified by a constant prefactor dependent on the Fermi
surface geometry. For temperatures below $T_\textrm{BG}$, processes that do not
conserve chirality induce a $T^2$ dependence in the electric resistivity,
opening a window where momentum-conserving interactions dominate transport
signatures. We quantitatively discuss this hydrodynamic window and put it into
context with recent experimental literature on the subject.

Mesoscale and Nanoscale Physics