The effect of external perturbations on the energy of temperature pulsations in a heated liquid film

The dynamics of temperature pulsations on the surface of a heated water film flowing vertically down was analyzed under the conditions of 3D wave movement for an unperturbed film and upon introduction of external perturbations with “the most dangerous wavelength.” It was established for the first time that artificial perturbations increase the amplitude and spectral energy, as well as expand the frequency range of temperature pulsations in the bottom part of the heater compared to the case without perturbation. External perturbations were found to cause an increase in the average integral energy of temperature pulsations per unit time in the bottom part of the heater and, consequently, an increase in the film resistance to rupture.