Abstract
The existence of internal circulation in fluid droplets has been demonstrated by a number of investigators. The internal circulation, where present, provides an important mechanism for the heat and/or mass transfer associated with a moving liquid drop. In this paper we discuss the different roles played by this mechanism in the context of a moving drop experiencing condensation (inward radial field) or evaporation (outward radial field). It is noted that the strength of the internal vortex is not only a highly useful parameter in the modelling of transport to moving drops but is also necessary in the actual evaluation of the extent of transport. We provide analytical expressions for estimating the vortex strength in circumstances where the drop translation is in the low Reynolds Number regime while the radial field has inertia. We have also numerically investigated the internal circulation in a drop translating at intermediate Reynolds number ( Re=O(100)).
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