Differences in the temperature field and deformation of locally heated thin liquid film are studied theoretically for various velocity profiles: parabolic velocity profile in the case of gravity-driven film flow, and uniform one in the case of moving heat source in zero-gravity conditions. Conjugate (hydrodynamic and heat) two-dimensional steady-state problem is solved using long-wave approximation. It is shown that under equal other conditions the flow with uniform velocity profile is characterized by dramatic increase in the thermocapillary deformation of the free surface. At the same time this regime possesses higher stability for dry spot formation comparatively with the shear-driven flow regime.
Equilibrium shape of dry spot in isothermal liquid film on a horizontal substrate