>I can now visuallize the boundry layers being in turbulance so that maximum amount of radiant heat is transferred.
Great. But a clarification: radiant heat transfer (by photons like visible and IR light), happens through and regardless of boundary layers. It is convective/conductive heat transfer that is effected so greatly by boundary layers.
Sometimes "dead air" or boundary layers are our friends and sometimes our enemies.
Let me give the reverse example - helpful boundary layers decreasing heat transfer:
When we think of "wind chill" we instinctive know that high speed wind makes for more heat transfer (cold winds cool us, convection ovens cook faster). Consider the layer of air nearest your skin. Define it as the air that moving between 0% (right at your skin) and 95% of the bulk air flow (the wind). That layer is the "boundary layer". Within the layer, there is laminar flow (each infinitesimally thin sub layer sliding, unmixed, past the adjacent sublayer). As such, heat transfer is slow, just like in the "dead air space" in your sleeping pad or down jacket. i.e. very little heat transfer. As the wind speed increases, the thickness of that boundary layer decreases significantly.
When everything is laminar, that layer is huge. At very high wind speeds, the boundary layer gets very thin and there is much more heat transfer (HX).
For HX to a pot, you can't generate high speeds (unless you do a very tall chimney). But vortex generators on airplane wings "energize" or stir the boundary layer without much drag. This can be as simple as little tabs, placed 20-30 degrees to the air flow. I've done that with the very sticky aluminum tape (the REAL duct tape - that one would use on a high-temperature duct) and it significantly increase efficient for very little weight.
Here's a video that's older than I am, but which I watched in my fluid dynamics class. Around 4:30, they give a good definition of boundary layer. There are great demonstrations of actual boundary layers under different conditions. It gets kinds of mathy, but crack a beer, and take another sip for every differential or integral sign they use. Try to follow the qualitative aspects of it and try to develop a better sense of the following concepts:
The "no-slip" condition at the walls.
Boundary layer thickness as a function of bulk velocity.
How the boundary layer varies over the length of a surface.