I am not sure I agree with the comments that white smoke is an indicator that conditions are too lean, and that dark smoke is an indicator of conditions that are too rich. Nearly all substances give off white smoke when they pyrolyse and this is laden with unburnt fuel and can be deceptively dangerous! Dark smoke is often rich in unburnt fuel but it depends a lot on how efficient the combustion process and the fuel package.
I am also not sure about how scientific the smoke filtering concepts is. Soot will deposit readily on surfaces, but in my experience it has little impact on the color. It may reduce the thickness (optical density) but it will still be black. Either way I believe that it is incorrect (and possibly dangerous) to relate smoke color to flammability range.
Laminar or turbulent flows depend on a number of factors and are more a function of the size and location of the openings in relation to the stage of fire development.
Interpreting fire indicators is a vital skill, but it needs to be supported by science and fact and to stay away from myths.