Transient thermal boundary layer in heating of droplet with internal circulation - Evaluation of assumptions

The importance of liquid thermal boundary layer in the transient heating of a liquid droplet with internal circulation is examined. The thermal boundary layer quasi-steadiness assumption is also studied. The results show that, unless the thermal boundary layer is extremely thin (extremely large Peclet numbers), the thermal inertia term is important and the quasi-steadiness assumption is invalid. The results also tend to suggest that the elimination of the thermal boundary layer may still give solutions with acceptable degree of accuracy.