Karlov S., Kazenin D., Vyazmin A., Pirogova O., Okhotnikova K., 2013, Convection During the Fluid Heating by Laser Emission, Chemical Engineering Transactions, 32, 565-570.
In this work hydrodynamics flows with surface tension forces appearing due to fluid heating by a laser emission are considered. Several unsteady hydrodynamics model of such flows near the heating spot characterized by various evolution stages of the process are considered. For this model an axisymmetric flow approximation is used. The first class of models of unsteady flow with a spreading of the liquid layer describes the initial process phase. A structure of flows, where under surface tension forces the spreading of the layer on the substrate occurs with an unsteady velocity profile, is considered. The second class of models for long times takes into account the appearance of unsteady pressure gradients, which prevent the spreading. It is demonstrated that the pressure gradient rise and their growth lead to a generation of unsteady circulation flow near to the heating axis. New experimental data showing the flow structure near the heating spot are reported. Such flow reveals a complex system of convection streams. A toroidal vortex structure appears near to the heating spot, where convective cells join to this toroidal vortex structure from outside.
