Convection and conduction heat transfer using boundary heat source in COMSOL

In this video conduction and convection have been modeled using COMSOL. The heat source is a boundary heat source at the interface of a solid and a fluid domain.

[@the24thintrovert]

A flat plate on top of which there is a fluid domain. Nice work

[@djdelta777]

Nice and well explained tutorial. Why does inflow/inlet and boundary heat source have to be duplicated in laminar flow and heat transfer modules?