The bubbler enables coolant to travel into difficult areas for more efficient cooling. The coolant flows through the central channel and then out and around the outside of the channel to the outlet point.
Baffles and bubblers both increase flow turbulence due to the inclusion of additional bends in the coolant flow system. The increased turbulence enhances heat transfer. The geometrical shape of a bubbler facilitates the application of cooling to areas that are otherwise difficult to reach.