  Observations and numerical simulations have shown that outflows generally
exist in the accretion process. We revisit the thermal equilibrium solutions of
black hole accretion flows by including the role of outflows. Our study focuses
on the comparison of the cooling rate of outflows with that of advection. Our
results show that, except for the inner region, outflows can dominate over
advection in a wide range of the flow, which is in good agreement with previous
numerical simulations. We argue that an advection-dominated inner region
together with an outflow-dominated outer region should be a general radial
distribution for both super-Eddington accretion flows and optically thin flows
with low accretion rates.
